Danfoss EPU 2370 Operating instructions

Brand: Danfoss

Model: EPU 2370

Type: Operating instructions

BC-HM VI.72.N1.02 © Danfoss 9/97 1

Instruction

EPU 2370

087R9345

Contents

System selection................................... 2

Wiring....................................................3

Operation ..............................................5

Time control ..........................................6

External time switch .............................. 7

ESME override......................................7

Temporary reduced

temperature override ............................ 7

External set point .................................. 8

General frost protection ........................8

Digital settings ......................................9

Digital settings (factory) ......................10

Position function description ............... 11

Mounting ............................................. 16

Dismounting ........................................ 17

Time switch mounting and

dismounting......................................... 18

Application 1-A.................................... 19

Application 1-B and 1-C......................22

2 VI.72.N1.02 © Danfoss 9/97 BC-HM

System selection

(application selection)

EPU 2370 is a multi-purpose constant

temperature control to be used in a wide

range of applications. EPU 2370 is set

for required application on selecting

application number before selecting

other settings (see paragraph "Settings",

page 9).

Each application number has a range of

applicable control principles. On

connecting necessary sensors EPU

2370 automatically registers the control

principle (registration is active on

connecting voltage to the control).

Followng applications can be selected in

P0.2.

App. System Description Page

0 Installation

Control not possible, but sensor temperatures

can be read-off and valve motor and relay outlets

can be manually controleld.

1 Hot-water-service system

1-A Instantaneous hot-water-service control with heat ex- 19

changer and three-way valve (PI: Proportional Integral)

1-B og 1-C Semi-instantaneous hot-water-service control with heat 22

exchanger and one or two sensor storage tank

(ON/OFF thermostat + PI control).

BC-HM VI.72.N1.02 © Danfoss 9/97 3

Wiring

Terminal strips

Terminal strips with screw fastening wire

the controller.

Each terminal can wire up to 3 x 1.5

or the like. The terminals are

encoded, so units with supply voltage

cannot be wired in the safety voltage

part.

Terminal Load

Neutral (N) - 230 V a.c. 13

Line (L) - 230 V a.c. 14

16 (close) 8 (2) A 250 V a.c.

Reversible gear motor 230 V a.c. - AMB, AMV

17 (open) 8 (2) A 250 V a.c.

Relay outlet (R1) 230 V a.c.- NC 21 - 22 8 (2) A 250 V a.c.

Relay outlet (R2) 230 V a.c. - NC 23 - 24 8 (2) A 250 V a.c.

Temperature sensor connection, etc.

- safety voltage (terminals 1 - 12)

Sensor and remote unit mounting is

described in instructions, which are

delivered together with the products.

Type Terminal

S1 flow temperature sensor ESMA/B/C/U 10 - 11

S2 top tank temperature sensor ESMB/U 7 - 9

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

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

S5 external set point potentiometer ESME 4 - 5

S6 bottom tank temperature sensor ESMB/U 8 - 9

External time switch/override ECA 9010 3 - 4

BUS for communication 1 - 2

4 VI.72.N1.02 © Danfoss 9/97 BC-HM

Wiring

BC-HM VI.72.N1.02 © Danfoss 9/97 5

Operation

a) Programmable time switch

b) Light indication

c) Display

d) "+" button

e) "-" button

f) Position selector

g) Funktion switch

h) User guide

a) Time switch

Analog time switch is set in the required

normal and reduced temperature

periods in pushing riders for reduced

temperature settings towards the center

of the time switch.

Set actual time and week day vis-a-vis

the mark in turning the dial in arrow

direction

Digital time switch ECA 9016 or 9017,

see enclosed user guide.

b) Light indication

- constantly alight when controller is

operating

- flashes when receiving alarm signal

(sensor fault or frost protection).

Alarm code can be read-off in P7.1.

(Press (+) button for 5 sec. to change

from P7.0 to P7.1)

c) Display

Display shows actual and reference

temperatures and various settings.

d) and e) "+" and "-" buttons

Used for control setting and

programming.

f) Position selector

Position selector is used when selecting

temperature indication and

programming. The selector can be set in

ten different postions, however the cover

plate shows only 3 positions with below

symbols:

Display shows actual temperature

at sensor S1 (PI-control)

Display shows required normal

temperature. This temperature is

changed in using the "+" and "−"

buttons

Display shows the required reduced

temperature. This temperature is

changed in using the "+" and "−"

buttons

Other 7 positions are used when show-

ing other system temperatures and

when programming. (see settings page

6 VI.72.N1.02 © Danfoss 9/97 BC-HM

g) Function selector

Control is cancelled, frost protection

at 6 °C. Time control not possible.

Constant reduced temperature.

Relay outputs status depend on

selected application.

Automatic changeover between

normal and reduced temperature

according to time switch settings.

Relay outputs status depend on

selected application.

Constant normal temperature. Relay

outputs status depend on selected

application.

Manual control. Controller function

off. Valve motor receives no control

signals. Use buttons "+" and "−" d)

and e) for manual control of valve.

Relay outputs R1 and R2 can be

controlled manually using the SET-

button with following combinations:

R1 R2

1st push 0 0

2nd push 0 1

3rd push 1 0

4th push 1 1

0 = open contact

1 = closed contact

P0.0 shows relay status and motor

function in horizontal bars. A

horizontal bar = closed contact)

Time control

EPU 2370 can be time controlled by a

built-in or external time switch (see

paragraph "time switch mounting", page

18), by ECA 9020 or by master control

connected to BUS.

EPU 2370 has two internal channels.

Channel 1 for relay outlet R1 and

channel 2 for relay outlet R2. Use P 0.3

setting function pages 9-15 for selecting

time switch zones.

Selectable zones

R1* R2

1-zone

0, 1 0, 1

time switch

2-zone

0, 1, 2 0, 1, 2

time switch

Master

control 0, 3, 4 0, 3, 4

(BUS)

ECA 9020

0, 1, 2, 3, 4 0, 1, 2, 3, 4

(BUS)

*) R1 and changeover between normal

and reduced temperatures

0 = no time control

BC-HM VI.72.N1.02 © Danfoss 9/97 7

External time switch

ECA 9010 is connected to time switch

inlet terminals 2, 3 and 4 and used for

external time control. Time control only

applies to relay outlet R1 and can be

received by the control only when

function switch is set in position

Time switch or contact set are connected

to ECA 9010 inlets, terminals 1, 2 and 3.

A closed contact will override normal or

reduced temperatures as shown below:

ECA 9010

Function

terminals

Normal temperature 2 and 3

Reduced temperature 1 and 3

ESME override

Remote control module ESME

connected to terminals 4 and 5 is used

for external override. Override signal

only applies to relay outlet R1 and can

can be received by the control only when

function switch is set in position

Temporary reduced temperature

override

Use external override module (ESME

connected to terminals 4 and 5 or

external time switch connected to

terminals 3 and 4) for 2 hours temporary

external reduced temperature override.

Override is cut-in on setting function

switch for ESME or for time switch in

for 5 to 30 sec. and then back to .

Override is cancelled on setting function

switch in

for 5 to 30 sec. and then

back again

8 VI.72.N1.02 © Danfoss 9/97 BC-HM

External set point

Normal temperature can be set

externally on remote setting module

ESME potentiometer. ESME is

connected to terminals 4 and 5 and

overrides normal temperature setting in

control P 8.0.

Note! Override or external set point

connected to terminals 4 and 5 cannot

be applied at the same time as external

time switch on terminals 3 and 4.

General frost protection

EPU 2370 has built-in frost protection to

prevent sensor temperatures from falling

below +6 °C.

Application 1-A

Relay contacts R1 and R2 are closed

(pumps ON) if sensor S1 or S4

temperatures are below +6°C.

Three minutes after all sensor

temperatures are above +6°C again

relay contacts R1 and R2 return to

normal position.

Applications 1-B and 1-C

(storage tank systems)

Relay contact R1 closes (pump ON) if

sensor S1, S2 or S4 is below +6°C.

Three minutes after all sensor

temperatures are above +6°C again

relay contact R1 returns to normal

position.

When connecting a separate S3 frost

protection sensor any place in the

system can be frost protected. Frost

protection limit is set in P3.1 (see digital

settings, pages 9-15)

BC-HM VI.72.N1.02 © Danfoss 9/97 9

On selecting a certain position the

display shows position number (e.g.

P2.3) and a value (e.g. 70 °C) by turns.

Note! column 0 only shows values.

Change values

1) Select position (columns 2,3 and 4)

2) Press SET once - display flashes

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

4) Press SET to save value

Note:

It is not possible to select setting before

application number has been selected.

On selecting application number only

basic settings will be displayed. Each

application has certain factory-set

values, which can be changed if

required. (See system selection, page

2).

Reset of factory settings

Factory settings can be RESET on

selecting P 0.2 and pushing SET-button

twice.

Digital settings

Use display c) and buttons d), e), f) and

i) for checking and changing system

temperatures and settings, respectively.

Each display and setting range has a

certain "position", e.g. P3.4 (3 = row 3

and 4 = column 4, see scheme on digital

settings, page 10.

Select position

Use f) for selecting rows 0 to 9. Buttons

(+) and (-) are used for selecting column

0 to 4.

10 VI.72.N1.02 © Danfoss 9/97 BC-HM

Row ← (–) Column 0-4 (+) →

0-9

01234

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

Relay outlet Software Application Time switch BUS

status generation number: 1 channel: address: 15

code 1,2

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

S1 actual S1 reference Valve function Motor

temperature PI circuit at standby: 0 constant: 30 s

PI circuit

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

S2 actual S2 reference Temp.diff. Bacteria X

- propor-

hot water cut-in TS1-TS2: protection: tional band:

temperature temperature 5 K − − (OFF) 30 K

3 P3.0 P3.1 P3.4

S3 actual S3 frost T

- integra-

temperature protection limit: tion time:

2°C 30 s

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

S4 actual S4 return Return limit N

return temperature amplification: neutral zone:

temperature limit: −4K/K 2K

40 °C (max)

5 P5.0 P5.3

S5 actuel S5 Mid-point

external ext. pot.meter:

set point 50 °C

6 P6.0 P6.1 P6.2

S6 actual S6 reference Cut-in/cut-out

tank bottom cut-out difference:

temperature temperature 5 K

7 P7.0 P7.1

S1 actual Alarm code

temperature

8 P8.1

Normal

temperature

S1: 55°C

9 P9.1

Reduced

temperature

S1: 40°C

Digital settings (factory settings)

BC-HM VI.72.N1.02 © Danfoss 9/97 11

P 0.0 Status

Relay outlets R1 and R2

and valve motor status

shown as vertical bars in the

display. A bar indicates

closed relay contact.

P 0.1 Software generation

Display shows control software generation.

P 0.2 Application number 0-15

Setting required application:

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

valve motor and relay outlets manually controlled.

1 Hot-water-service system (PI and ON/OFF + PI), see pages 19-25

P 0.3 Time switch channel selection 0,1,2,3,4

Setting time switch channels for relay outlet R1 and R2 control. Reduced

temperature control according to R1. Channel for R1 is shown on the display

below symbol I and channel for R2 below symbol II.

0 No time control

1 Time control according to ECA 9020 channel 1, digital time switch channel 1

or analog time switch

2 Time control according to ECA 9020 channel 2 or digital time switch channel 2

3 Time control according to ECA 9020 channel 3 or master control channel 1

4 Time control according to ECA 9020 channel 4 or master control channel 2

Position function description

Relay outlet R1

Relay outlet R2

Reduced temperature

Valve closes

Valve opens

12 VI.72.N1.02 © Danfoss 9/97 BC-HM

P 0.4 BUS-addresses 0-15

Control address setting. Master control is always given address 15 and slave

controls always addresses 0 to 14.

Master control

Transmits:

Time switch signals and S3 temperatures

Receives:

Reference temperatures

Slave controls

Address 0

Receives:

Time switch signals and S3 temperatures*

Addresses 1 -14

Transmits:

Reference temperatures

Receives:

Time switch signals and S3 temperatures*

*Master-control S3-temperature is received only:

- when there is no S3 sensor in the slave control

- when slave control P 3.1 is set within range 2 - 10 °C

P 1.0 Actual S1 sensor temperature

Display shows actual S1 sensor temperature in PI circuit.

P 1.1 Required S1 sensor temperature

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

circuit, fx. 55°C normal temperature and 40° reduced temperature. Reference

temperature is identical with balance temperature incl. various compensations.

P 1.2 Valve function: 0 or 1

Valve function (application 1-B and 1-C):

0 When tank charge is completed valve closes (used in systems without circulation

or with tank circulation - 1-B)

1 When tank charge is completed valve control function is still active and

maintains charge temperature in circulation pipe - 1-C).

P 1.4 Motor constant: 5 - 899 s

Setting valve motor travel time from completely closed to compeltely open valve. On

setting correct travel time for motor/valve combination, Tn-integration time is stated

in seconds (P 3.4).

P 2.0 Actual S2 sensor temperature (application 1-B and 1-C only)

Display shows actual S2 sensor temperature (tank top temperature) .

P 2.1 Required S2 sensor temperature (application 1-B and 1-C only)

Display shows required S2 sensor temperature (tank top temperature - cut-in)

P 2.2 Temperature difference between S1 and S2 : 1 - 30 K

(application 1-B and 1-C only)

Setting temperature difference between S1 charge temperature and S2 sensor

(S6 sensor) cut-out temperature.

P 2.3 Bacteria protection: 10 - 99°C or (- -)

Setting required tank temperature of the bacteria protection function. Time and

frequency are set on time switch for R2 control. Function is active when time

switch is set in normal temperature.

Bacteria protection is not active(OFF), when display shows (- -)

P 2.4 Proportional band - Xp: 1 - 40 K

Setting proportional band - Xp. Proportional band states temperature range where

motor control pulse is proportional with temperature deviation. Beyond this range

control pulse is constantly ON. A small proportional band might cause instalibity.

P 3.0 Actual temperature at S3-sensor (frost protection sensor)

Display shows actual S3 sensor temperature.

P 3.1 Required frost protection S3 sensor temperature : 2 - 10 °C or “--”

Setting frost protection S3 sensor temperature. All Pt 1000 sensors are applicable.

When display shows “--” S3 signals from master control cannot be received.

P 3.4 Integration time - Tn: 5 - 899 s

Setting integration time - Tn. Integration time indicates the time that runs until

I-fucntion has changed output signal like P-function. Small values result in a short

response time, but involve risk of unstability (hunting)

P 4.0 Actual S4 sensor return temperature

Display shows actual S4 sensor return temperature

P 4.1 Required S4 sensor return temperature: ±(20-99) °C

Setting initial temperature for return temperature limitation. The limiter can operate

as maximum or minimum limiter.

Positiv value (+): max. limitation

Negativ value (-): min. limitation

P 4.2 Return temperature influence on reference temperature: ±(0 - 20)

When return temperature is above (max. limitation) or below (min. limitation) set

limit (P 4.1), reference temperature is increased or reduced. Value determines

change magnitude (amplification K/K) and sign determines direction.

Positiv value (+): reference temperature is increased

Negativ value (-): reference temperature is reduced

P 4.4 Neutral zone - Nz: 0 - 9 K

Display shows PI-circuit neutral zone. When the temperature is within neutral zone

the motor will receive no impulses

P 5.0 External set point - S5: -20 to 119 °C

Display shows set point set on external potentiometer.

Set point refers to S1.

P 5.3 Scale centre position for external set point : 0 - 99 °C

Setting scale centre position for external set point temperature range.

Note! External set point inlet has 1 minute time constant.

P 6.0 Actual S6 sensor temperature

Display shows actual S6 sensor temperature (tank bottom temperature)

S6-sensor is used as bottom sensor in hot-water-service tank charge system

(cut-out temperature)

P 6.1 Required S6 sensor temperature (application 1-B and 1-C)

Display shows required S6 sensor temperature (reference for temperature cut-out in

hot-water-service charge systems with 2 sensors)

P 6.2 Tank temperature difference: ±(0 - 90) K (app. 1-B and 1-C)

Setting difference between cut-in and cut-out temperature in tank charge system

P 7.0 Actual temperature

Display shows actual temperature measured by S1 sensor

P 7.1 Alarm code: 0-4

NB: Press (+)-button for 5 sec. to change from P 7.0 to P 7.1.

Read-off alarm code::

0 No alarm

1 S1-sensor is not connected

S1-sensor is short-circuited

Frost risk at S1-sensor

2 Frost risk at S2-sensor

3 Frost risk at S3-sensor

4 Frost risk at S4 sensor

When several alarms are activated at the same time the lowest figure is shown.

The alarm can only be reset when the cause of the alarm has been removed.

P 8.0 Normal temperature: -20 to 110 °C

Setting required temperature . Setting applies to S1 sensor

P 9.0 Reduced temperature : -20 to 110 °C

Setting required reduced temperature. Setting applies to S1 sensor

Monting

On wall

Use standard base plate or special base

plate with wall case for mounting EPU

controller.

The plate is fixed on a flat surface with

two Ø 4 mm screws (standard base

plate) or three Ø 4 mm screws (special

base plate). Be aware of the "UP"-arrow.

Then wire EPU controller as described in

paragraph "Wiring".

EPU is mounted in base plate (when

using speical base plate, note that the

controller is first of all to be fit into the

wall case) and screw up the center

screw behind the cover plate.

In panel

EPU can be built into a panel. The

opening is to measure 92 x 138 mm and

the plate is to be max. 3 mm thick.

Fix four retainer springs on the

controller, push it gently into the opening

and the springs will secure the controller

in the opening. The retainer springs are

delivered as accessories together with 2

terminals strips.

Wire EPU to the two terminal strips and

then mount them in the controller. The

terminals strips are encoded to prevent

exchange by mistake.

On DIN-rail

EPU can be mounted on a 35 mm DIN-

rail. Fix a spring - delivered as accessory

- on the base plate bottom and then

mount the base plate on the DIN-rail.

Several controllers in parallel

In panel

On wall or DIN-rail

Dismounting

Controllers in panels are dismounted in

pressing retainer springs together and

pushing controller out.

When retainer springs are not accessible

use a screw driver to tip out the

controller.

Time switch mounting

Remove glass cover, inside cover and

time switch cover and then mount time

switch.

Open the glass cover all the way to the

left - the taps will then slide out. Tip out

inside cover and unscrew time switch

cover.

Time switch is placed in the center of the

opening with plugs downwards.

Time switch dismounting

Remove screws and gently tip out time

switch.

Application 1-A

App. 1-A - Hot-water-service system with heat exchanger

(primary temperature control - 3 way)

Control principle 1-A:

PI-control of S1 hot-water-service

temperature (water tapping temperature).

Constant temperature is maintained in

controlling valve M in the primary heat

exchanger circuit. Circulation pump P

controlled by relay R1.

Remarks:

Below scheme shows relay status of

various operations

*) At switch from normal to reduced

temperature operation R1 is 3 minutes

delayed

0 = open relay contact

1 = closed relay contact

Operation

Stand by Reduced Normal Frost protection

Relay R1 0 0 1*) 1

time switch time switch

Relay R2 0 1

channel 2 channel 2

Wiring system type 1-A

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Danfoss EPU 2370 Operating instructions

Danfoss EPU 2370 Operating instructions

Danfoss EPU 2370 Operating instructions

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