Danfoss EPU 2370 Operating instructions

BC-HM VI.72.M4.02  Danfoss 11/97 1

Instructions (user manual)

EPU 2370

Contents

Installation........................................2-4

Electrical connections

and wiring diagram..........................5-6

Selection of system type ................... 7

Setting of system type .......................8

Operation........................................9-10

- program time switch

- + and - keys

- position selector

- function selector

Time control .................................11-12

- external time switch

- override with ESME

- provisional override to normal

temperature

External setpoint ..............................12

General frost protection ..................12

Digital settings.............................13-21

- operation

- position overview (matrix)

- position function description

(pages 15-21)

System types................................22-48

- see overview on page 7

087R9367

2 VI.72.M4.02  Danfoss 11/97 BC-HM

Installation

Wall mounting

For wall mounting use either a standard

base plate or a special base plate with

associated case.

Fasten the base on a flat surface using

two ∅4 mm screws (standard base

plate) or three ∅4 mm screws (special

base plate). Remember that the arrow in

the bottom of the base plate must point

upwards.

The control can now be wired (see

section “Electrical connections”).

The control must be mounted in the

base (with special base plate mount

case first) and fastened with the staybolt

under the cover plate.

Panel mounting

(in cutout)

The control can be mounted in a panel

with a cutout of 92 x 138 mm (max.

sheet thickness 3 mm). Fit four retainer

springs on the control before mounting.

The retainer springs are available as

accessories, the set consisting of four

springs and two terminal strips.

Electrical connections must be made to

the loose terminal strips which can then

be mounted. The terminal strips are

coded to prevent mains voltage section

from being connected to low-voltage

section.

Mounting on DIN rail

The control can be mounted on a 35 mm

DIN rail. The base must be fastened by

a spring (available as an accessory)

which must be fitted at the rear of the

base before mounting on the DIN rail.

BC-HM VI.72.M4.02  Danfoss 11/97 3

Several EPU 2370 controls, side by side

Panel mounting

Wall mounting or on DIN rail

Removal from panel

When the control is mounted in a panel

cutout the easiest way to remove it is to

depress the retainer springs on the rear

and press it out of the cutout.

If there is no access to the rear of the

control, it can be tilted out of the cutout

by inserting a screwdriver in the two

recesses provided in both ends of the

unit.

4 VI.72.M4.02  Danfoss 11/97 BC-HM

Time switch mounting

An analog or digital time switch can be

fitted by first removing the plastic lid,

cover plate and time switch cover.

Remove the lid by pressing it towards

the left. The spigots will slide out of the

hinges. The time switch cover can be

removed by taking out the two screws.

Insert the time switch with pins

downwards and centre it in the case.

Then secure time switch and frame with

the screws provided.

Replacement of time switch

The time switch can be removed after

the screws have been taken out by

carefully tilting it from the top with a

small screwdriver.

BC-HM VI.72.M4.02  Danfoss 11/97 5

Electrical connections and

wiring diagram

Connection to 230 VAC -

(terminals 13-24)

The control must be connected using the

terminal strips with screw terminals.

Up to 3 x 1.5 mm² or corresponding

wires can be connected in each

terminal. The terminal strips are coded

to prevent terminal strips with mains

voltage being connected to sensor

terminals.

Terminal Load

Neutral (N) - 230 V~ 13

Phase (L) - 230 V~ 14

16 (close) 8(2)A 250V~

Reversible gear motor 230 V~, AMB, AMV etc.

17 (open) 8(2)A 250V~

Relay output R1 - 230 V~ (NC) 21 - 22 8(2)A 250V~

Relay output R2 - 230 V~ (NC) 23 - 24 8(2)A 250V~

Connections for sensors, etc. -

safety voltage (terminals 1 - 12)

Sensor mounting is described in the

instructions enclosed with the product.

Wire cross-section: min. 0.4 mm²

Total length of all sensor and BUS

wires: max. 150 metres.

Type Terminal

S1 flow/duct (PI circuit) ESMA/B/C/U 10 - 11

storage tank upper sensor ESMB/U

S2 7 - 9

room sensor (P circuit) ESMR

S3 frost protection sensor ESMB/U/T 11 - 12

S4 return temperature sensor ESMA/B/C/U 4 - 6

S5 external setpoint ESME 4 - 5

storage tank lower sensor ESMB/U

S6 8 - 9

compensation sensor ESMR/T

External time switch/override ECA 9010 3 - 4

Communication BUS 1 - 2

Note!

Wire resistance can give measurement

error. A resistance of 4 ohm

corresponds to a temperature increase

of about 1 degree.

6 VI.72.M4.02  Danfoss 11/97 BC-HM

Wiring diagram (general)

The above wiring diagram shows all

connection possibilities for sensors, etc.

In the individual system types, the

necessary electrical connections are

shown with full lines. The remaining

possibilities are chain-dotted (see

system types on pages 22-48).

BC-HM VI.72.M4.02  Danfoss 11/97 7

Selection of system type

EPU 2370 is a multipurpose control for

use with several different types of

systems. Therefore the type of system

must be selected before the control is

operated. The selection procedure is as

follows: 1) Connect sensors, 2) Connect

voltage, 3) Select system type.

The individual system type numbers

denote different control principles. When

the necessary sensors have been

connected and the system type

selected, control operation on that

principle is automatically activated.

The following system types can be

selected in P0.2 (see also page 8):

System

System-

Description type Page

type

number

Installation 0

No control, but sensor temperatures can be

read off and valve motor and relay outputs can be

controlled manually.

Hot-water-service system 1 22-29

Control of flow heat exchanger with 1-A and 1-B

two and three-way valve - (PI).

Control of hot-water-service system with 1-C

secondary mixing - (PI)

Control of heat exchanger - storage tank charging with 1-D and 1-E

one or two tank sensors - (ON/OFF + PI).

Radiator system 2 30-33

Constant flow temperature control - (PI) 2-A

Constant room temperature control - (P+PI) 2-B

Water to air system (unit heater) 3 34-37

Constant room temperature control - (P+PI) 3-A

Floor heating system 4 38-41

Constant flow temperature control - (PI) 4-A

Constant room temperature control - (P+PI) 4-B

Ventilation system 5 42-45

Constant duct temperature control - (PI) 5-A

Constant room temperature control - (P+PI) 5-B

Refrigeration system 6 46-48

Constant brine temperature control - (PI) 6-A

Constant room temperature control - (P+PI) 6-B

8 VI.72.M4.02  Danfoss 11/97 BC-HM

Setting of system type

number

- Remove the black cover plate.

- Set the position selector (f) on 0.

- Press the + key (d) twice.

The display will now change between

P0.2 and a number between 0 and 6.

- With a pointed object, press the SET

key (i). The number will begin to flash.

- Press either the + or - key (d or e)

until the display shows the required

system type number.

- Press the SET key (i) to store the

required system type number.

- Refit the black cover plate.

Control operates according to factory-

set values.

Note

If the factory-set values in the control

are to be changed, see the pages 13-48

or contact Danfoss.

Display of actual temperature

Actual temperature (hot water, flow or

room temperature) can be read off with

the function selector (f) on

(pos. 7).

Setting required normal temperature

Set the position selector (f) on

(pos.

8). The temperature can be increased or

reduced by pressing the + or - key.

Setting required reduced temperature

Set the position selector (f) on (pos.

9). The temperature can be increased or

reduced by pressing the + or - key.

BC-HM VI.72.M4.02  Danfoss 11/97 9

Operation

a) Program time switch

b) Light emitting diode

c) Display

d) + key

e) - key

f) Position selector

g) Function selector

h) User instructions

a) Program time switch

If an analog program time switch is

mounted it can be set for normal and

reduced temperature periods by pushing

the slides in towards the middle to set

the periods in which an reduced

temperature is required.

The correct time and day can be set

opposite the markings by turning the dial

in the direction of the arrow.

If a digital time switch type ECA 9016 or

9017 is used, see the instructions

enclosed with the time switch.

b) Light emitting diode

The diode indicates as follows:

- lights up constantly when the control

is on.

- flashes when an alarm signal is

registered. At the same time, an

alarm code can be read off in P7.1.

See description of alarm codes in

section on settings, page 21.

c) Display

The display shows diverse temperatures

and settings.

d) and e) + and - keys

These keys are for use when setting and

programming the control.

f) Position selector

The function selector is for use in

selecting temperature indication and

programming. The selector can be set in

ten different positions, but on the cover

plate only three positions and associated

symbols are shown.

The display indicates the actual

temperature at sensor S1 (PI

control) or sensor S2 (P + PI

control).

T

The display indicates the required

normal temperature. The

temperature can be changed using

the + and - keys.

T

The display indicates the required

reduced temperature. The

temperature can be changed using

the + and - keys.

The remaining seven positions are used

for indicating other system temperatures

and in programming (see digital settings,

page 13).

10 VI.72.M4.02  Danfoss 11/97 BC-HM

g) Function selector

Control stopped, but system frost-

protected at 6 °C.

Time control not possible.

Constant reduced temperature.

The status of relay outputs depends

on the type of system selected.

Changeover between normal and

reduced temperature, as set on the

time switch.

The status of relay outputs depends

on the type of system selected.

Constant normal temperature.

The status of relay outputs depends

on the type of system selected.

Manual operation

All control functions inactive. The

control valve motor can be

operated manually with + and -

keys.

Relay outputs R1 and R2 can be

operated manually by pressing the

SET key (i) (see page 13).

The following combinations are

possible:

R1 (I) R2 (II)

00

01

10

11

0 = open contact

1 = closed contact

In P0.0 the relay status and motor

function are displayed by horizontal

bars. A horizontal bar means

closed contact, see page 15, P0.0

BC-HM VI.72.M4.02  Danfoss 11/97 11

Funktion Resistance

Normal temperature Short circuited

Reduced temperature 820 Ω

Time control

The temperatures of hot-water-service,

room, flow or duct can be reduced

(increased) by a time program, provided

a time switch is built into the control (see

section on time switch mounting, page

4). Alternatively, an external time switch

can be connected. Time control is also

possible through ECA 9020 or a master

control connected to the BUS.

By setting in P0.3 it is possible to select

precisely the zone that is to control

normal and reduced temperatures, relay

output R1 and relay output R2.

(Changeover between normal and

reduced temperature always follows the

zone that controls R1).

For position P0.3, see page 15.

External time switch

External time control is possible via

override module ECA 9010 on time

switch input terminals 2, 3 and 4. Time

control applies only to relay R1 and can

only be received by the EPU when the

function selector is in position

.

ECA 9010 is necessary when the

contact set in the external time switch is

not gold plated.

The contact set must be connected to

one of the ECA 9010 inputs. The

following time control functions are

possible:

If the contact set is gold plated,

connection can be made direct to control

terminals 3 and 4. Closed contact gives

normal temperature.

ECA 9010

Function

terminal

Normal temperature 2 and 3

Reduced temperature 1 and 3

12 VI.72.M4.02  Danfoss 11/97 BC-HM

Override with ESME

External override is possible with remote

control unit ESME connected to

terminals 4 and 5. The override signal

applies only to relay output R1 and can

only be received by the control when the

function selector is in position

.

Provisional override to normal

temperature

Provisional override to normal

temperature for 2 hours is possible when

an external override unit is used (ESME

connected to terminals 4 and 5 or

external time switch connected to

terminals 3 and 4).

Override can be started by setting the

ESME or time switch function selector

on

for 5-30 seconds and then back to

.

Override can be annulled by setting the

function selector on

for at least 5

seconds and then back to

.

External setpoint

Normal temperature can be set

externally with the potentiometer in the

remote control unit (ESME). ESME must

be connected to terminals 4 and 5. It

overrides the normal temperature setting

on the control in P8.0. The setting range

becomes ±20 K about the middle

temperature setting in P5.3 (approx. 2 Ω/

degree).

Note! Override or external setpoint

connected to terminals 4 and 5 is not

possible when an external time switch is

connected to terminals 3 and 4.

General frost protection

EPU 2370 has a frost protection function

which ensures that the measured

temperature at the sensors does not fall

below 6°C. If the temperature at one of

the sensors, S1, S2 or S4, is lower than

6°C, relay contacts R1 and R2 become

activated. When all sensor temperatures

are higher than 6°C the relay contacts

return to their initial position, after a

delay of 3 minutes.

In applications 3 and 5 the delay

depends on the setting in P.4.3.

Note:

Actual frost protection depends on

the application selected.

It is also possible to protect the system

against frost at any point by connecting

a separate S3 sensor. Frost protection

limits must be set in P3.1 (see digital

settings).

BC-HM VI.72.M4.02  Danfoss 11/97 13

Digital settings

Operation

The system temperatures and settings

can be controlled or changed by using

the display (c) and keys (d), (e), (f), and

(i).

Each control and setting range has a

“given” position, e.g. P3.4 where 3 refers

to row 3 and 4 to column 4. (See

position overview (j) on next page).

Position selection

The switch (f) selects a row between 0

and 9, keys + and - select a column

between 0 and 4.

When a position is selected, the display

alternates between the position number

(e.g. P2.3) and a value (e.g. 70°C).

Note! In column 0 only values are

displayed.

Changing values

1) Select the required position.

2) Press SET once - the display flashes.

3) Change the value with the (+) and (-)

keys.

4) Press SET to store the value.

Note:

It is not possible to make settings before

the system type number has been

chosen. When this has been done, only

the necessary settings are displayed.

There is a set of factory settings for

each type of system. These values can

be changed as desired. (See selection

of system type, page 7).

Resetting factory settings

To begin again with factory settings,

RESET can be accessed by selecting

P0.2 and then pressing the SET key

twice.

14 VI.72.M4.02  Danfoss 11/97 BC-HM

Row ← (–) Column 0-4 (+) →

0-9

01234

0 P0.0 P0.1 P0.2 P0.3 P0.4

Status Software System Time switch Bus

generation number channel select address

0-15 0,1,2,3,4 0-15

1 P1.0 P1.1 P1.2 P1.3 P1.4

S1 actual S1 reference Total stop Balance Motor

temperature PI circuit 0 or 1 temperature constant

PI circuit -20 til 110 °C 1-899 s

2 P2.0 P2.1 P2.2 P2.3 P2.4

S2 actual S2 reference Temp.diff. Anti-bacteria X

p

- propor-

storage tank/ storage tank/ TS1-TS2 function tional band

room temp. room temp. 1-30 °C 0-99 °C / - - 1-199 K

3 P3.0 P3.1 P3.4

S3 actual S3 frost T

n

- integra-

temperature protection limit tion time

2-10 °C / - - 1-899 s

4 P4.0 P4.1 P4.2 P4.3 P4.4

S4 actual S4 return Return limit Warm-start N

z

-

return max./min. amplification delay time neutral zone

temperature +(20-99) or ±(0-20) 1-899 s 0-9 K

-(20-99)

5 P5.0 P5.3 P5.4

S5 actual S5 Mid-point Tmax.

ext. setpoint ext. pot. PI circuit

0-99 °C -20 to 110 °C

6 P6.0 P6.1 P6.2 P6.3 P6.4

S6 (S2*) actual S6 reference Compensation Compensation Tmin.

temperature storage tank/ base point I/ factor I PI circuit

compensation diff S2-S6 ±(0-20) -20 to 110 °C

temperature ±(0-90)

7 P7.0 P7.1 P7.2 P7.3 P7.4

S1/S2 actual Alarm code Compensation Compensation K

p

- propor-

temperature base point II factor II tional factor

±(0-90) ±(0-20) 0-30

8 P8.0

Normal

temperature

-20 to 110 °C

9 P9.0

Reduced

temperature

-20 to 110 °C

*

See description of position functions, pages 15-21.

Factory settings are shown under the system type concerned, see pages 22-48.

Position overview (matrix)

*

BC-HM VI.72.M4.02  Danfoss 11/97 15

P0.0 Status

Relay outputs R1 and R2

and valve motor status

displayed as horizontal bars.

A horizontal bar means contact

closed in relay.

P0.1 Software generation

Control software generation displayed.

P0.2 System type number 0-15

Setting of required system:

0 Installation. Control not possible, but sensor temperatures can be read off,

valve motor and relay outputs can be manually controlled.

1 Hot-water-service system (PI and ON/OFF + PI)

2 Radiator system (PI and P + PI)

3 Water to air system (unit heater) (PI and P + PI)

4 Floor heating system (PI and P + PI)

5 Ventilation system (PI and P + PI)

6 Refrigeration system (PI and P + PI)

(see system selection, page 7)

P0.3 Time switch channel selection 0,1,2,3,4

Setting of time switch channels to control relay outputs R1 and R2. Reduced

temperature always follows the channel controlling R1.

Relay output R2

Reduced temperature and relay output R1

x can be set at the following values:

0 No time control

1 Time control - channel 1 on analog time switch or digital time switch or

channel 1 on ECA 9020.

2 Time control - channel 2 on digital time switch or channel 2 on ECA 9020.

3 Time control - channel 3 on ECA 9020 or channel 1 on master control.

4 Time control - channel 4 on ECA 9020 or channel 2 on master control.

Override of relay output R1 possible with external override unit or with function

selector, irrespective of setting in P0.3.

Description of position functions

Relay output R1

Relay output R2

Reduced temperature

Valve closed

Valve open

xx

16 VI.72.M4.02  Danfoss 11/97 BC-HM

P0.4 Bus address 0 - 15

Setting of control address. Master control must always have address 15 and slaves

always 0-14.

Master control

Transmits:

Time switch signal and S3 temperature

Receives:

Reference temperature

Slave regulator

Address 0

Receives:

Time switch signal or S3 temperature*

Address 1-14

Transmits:

Reference temperature

Receives:

Time switch signal and S3 temperature*

*Master control S3 temperature can only be received under the following conditions:

- no sensor S3 on slave control

- slave control P3.1 must be set within range 2-10°C

P1.0 Actual temperature at sensor S1

Display shows actual temperature at sensor S1 in PI circuit.

P1.1 Required temperature at sensor S1

Display shows temperature required (reference temperature) at sensor S1 in PI

circuit. Reference temperature is the sum of balance temperature and diverse

compensations.

P1.2 Valve function/Total stop: 0 or 1

Valve function (systems 1-D and 1-E)

0 When storage tank charging is finished the valve closes (system without

circulation or system with circulation through tank - 1-D).

1 When storage tank charging is finished the valve continues to control and

maintains charging temperature in circulation line (system with circulation

through heat exchanger - 1-E).

Total stop (system 2-6)

0 On reduced operation, control according to reduced temperature as set in

P9.0.

1 On reduced operation, control according to frost protection temperature

6°C. If room temperature falls below set value in P9.0, control again

according to normal temperature (P8.0) until temperature rises 1°C.

P1.3 Balance temperature for S1 reference: -20 to 110°C

When sensor S2 is connected (P + PI control) the PI circuit reference varies around

the balance temperature. The basic setting of the balance temperature depends on

the system selected. The balance temperature is adaptive and can vary ±5 K

around the set value. The displacement is not displayed in this position.

P1.4 Motor constant: 1 - 899 s

Setting of valve motor running time from fully closed to fully open valve for the valve/

motor combination selected. When the correct time for the motor/valve combination

is set, the Tn integration time can be set in seconds (P3.4).

BC-HM VI.72.M4.02  Danfoss 11/97 17

P2.0 Actual temperature at sensor S2

Display of actual temperature at sensor S2.

P2.1 Required temperature at sensor S2

Display of temperature required (reference temperature) at sensor S2.

P2.2 Temperature difference between S1 and S2: 1 - 30°C

(System 1 D and 1 E only)

Setting of temperature difference between S1 charging temperature and sensor S2

(sensor S6) cutout temperature.

P2.3 Anti-bacteria function: 10 - 99°C or (- -)

Setting of temperature the storage tank is to reach when the anti-bacteria function is

cut in. Duration and frequency must be set on the time switch controlling relay

output R2.

The anti-bacteria function is OFF when (- -) is displayed.

P2.4 Proportional band - Xp: 1 - 199 K

Setting of proportional band - Xp. The proportional band gives the temperature

range in which the length of motor control pulse is proportional to the temperature

deviation. Outside this range the control pulse is constantly ON. With a small

proportional band there is a risk of instability.

P3.0 Actual temperature at sensor S3 (frost sensor)

Display of actual temperature at sensor S3.

If a KP thermostat is connected, the display becomes “- - -” when the input is short-

circuited.

P3.1 Required frost protection temperature at sensor S3: 2 - 10°C or “- -”

Setting of the temperature at which the system is to be frost-protected when frost

protector S3 is used. All Pt 1000 type sensors can be used. If “- - ” is set in the

display no S3 temperature can be received from the master control.

P3.4 Integration time - Tn: 1 - 899 s

Setting of integration time - Tn. The integration time expresses the time that elapses

until the I-function has changed the output signal like the P-function. A short

integration time gives fast control but with large overshoot (risk of instability).

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P4.0 Actual return temperature at sensor S4

Display of actual return temperature measured by sensor S4.

P4.1 Required return temperature at sensor S4: ±(20-99)°C

Setting of temperature at which return temperature limitation is to begin. The

limiter can function as max. or min. limiter.

Positive value (+): max. limit

Negative value (-): min. limit

P4.2 Return temperature limiter influence on reference temperature:±(0-20)

When return temperature is higher (max. limit) or lower (min. limit) than the set

limit in (P4.1) the reference is increased or reduced.

The value determines the magnitude of the change (amplification) and the sign

determines the direction.

Positive value (+): reference increased

Negative value (-): reference reduced

P4.3 Warm-start delay time: 1 - 899s

Setting of relay R1 delay. R1 is delayed at warm-start after night set-back and at

start after frost protection. (Applications 2, 3, 4 and 5 only.)

P4.4 Neutral zone - Nz: 0 - 9 K

Setting of neutral zone for PI circuit. When the temperature lies within the neutral

zone, the motor receives no pulses.

P5.0 External setpoint - S5: -20 to 119°C

Display of set point set with external potentiometer.

The setpoint applies only to S1 with (PI) control and S2 with (P + PI) control.

P5.3 Middle temperature for external setpoint: 0 - 99°C

Setting of middle temperature - setting range for external potentiometer.

Note: The input to external setpoint has a time constant of 1 minute.

P5.4 Maximum limiter in PI circuit: -20 to 110°C

Setting of highest permissible temperature in PI circuit.

BC-HM VI.72.M4.02  Danfoss 11/97 19

P6.0 Actual temperature at sensor S6

Display of actual temperature at sensor S6.

Sensor S6 can be used as follows:

- Lower sensor in hot-water-service storage tank in a tank-charging system (cutout

temperature).

- Compensation sensor, heating, refrigeration and ventilation systems.

P6.1 Required temperature at sensor S6

Display of temperature required at sensor S6 (reference temperature for decoupling

hot-water-service charging system when two sensors are used).

P6.2 System 1: Storage tank temperature differential: ±(0-90) K

Setting of differential between cutin and cutout temperatures in tank-charging

system.

System 2-6: Compensation I: ±(0-90)°C

Setting of temperature giving base point for compensation I.

Compensation influences sensor S1 reference.

The value indicates the temperature at which compensation begins. The sign

indicates maximum or minimum compensation.

(+): max. compensation

(-): min. compensation

20 VI.72.M4.02  Danfoss 11/97 BC-HM

P6.3 Compensation factor: ±(0-1-20)

Setting of value which states compensation influence on reference temperature (see

P6.2).

The sign of the value indicates increase or reduction of reference temperature on

compensation.

(+): reference increased

(-): reference reduced

P6.4 Minimum limitation in PI circuit: -20 to 110°C

Setting of lowest permissible temperature in PI circuit.

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Danfoss EPU 2370 Operating instructions

Danfoss EPU 2370 Operating instructions

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