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BC-HM VI.72.N1.02 © Danfoss 9/97 1
Instruction
EPU 2370
087R9345
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
mm
2
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)
T
Display shows required normal
temperature. This temperature is
changed in using the "+" and "−"
buttons
T
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
9)
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
P
- 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
N
- 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
Z
-
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).
BC-HM VI.72.N1.02 © Danfoss 9/97 13
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)
14 VI.72.N1.02 © Danfoss 9/97 BC-HM
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.
BC-HM VI.72.N1.02 © Danfoss 9/97 15
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
16 VI.72.N1.02 © Danfoss 9/97 BC-HM
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.
BC-HM VI.72.N1.02 © Danfoss 9/97 17
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.
18 VI.72.N1.02 © Danfoss 9/97 BC-HM
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.
BC-HM VI.72.N1.02 © Danfoss 9/97 19
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
b
is
controlled by relay R1.
20 VI.72.N1.02 © Danfoss 9/97 BC-HM
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
/