VDH MC 785 CHILLER-2 User manual

Description : MC 785 CHILLER-2 Doc.no.: 032189
Type: MANUAL No. of pages: 16 Version: V1.5
File: Do032189 MC785-CHILLER v15 EN.wpd
Software: 021913_MC785 CHILLER V2.02
By: BJB Date: 29-03-2012
VDH Products BV - Roden - Holland Signed: File: Doc'02
MC 785 CHILLER-2
User manual
(Panel-mounted)

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 2 of 16
This document has been prepared with great care and the information it contains is assumed to be accurate.
However, VDH Products does not accept any liability for eventual mistakes and errors and reserves the right
to alter or adapt the document without notice.
Table of contents
1Technical specifications ........................................................3
1.1 General ...............................................................3
1.2 Front ..................................................................3
1.3 Inputs and outputs .......................................................4
1.4 On LMS Modules ........................................................4
2Functional specifications .......................................................5
3 Operation ...................................................................6
3.1 Switching the chiller on and off .............................................6
3.2 Readout of different pressure and temperature sensors ..........................6
3.3 Switching from cooling/heating .............................................6
3.4 Changing the temperature setpoint ..........................................6
3.5 Changing the chiller pump .................................................6
3.6 Changing the sea pumps mode .............................................6
3.7 Switching cooling/heating capacity and the sequence of the regulator ...............6
3.8 Maximum compressor capacity .............................................7
3.9 Switching off the carter delay ...............................................7
3.10 Readout the counters ....................................................7
3.11 Resetting all counters ....................................................7
3.12 Resetting alarms ........................................................7
3.13 Shifting the generator capacity (reduced generator load) .........................7
3.14 Emergency stop .........................................................7
3.15 Compressor startup release contacts ........................................7
4 Programming internal parameters ................................................ 7
4.1 Parameter table ......................................................... 8
4.2 Cooling control operation .................................................10
6 Sensor calibration ...........................................................11
7 Alarms ....................................................................11
8Front ......................................................................12
9Connection diagrams .........................................................13
9.1 Connections of MC 785-CHILLER 2 ........................................13
9.2 Principle of LMS modules connections ......................................14
9.3 Connections of LMS Modules. .............................................15
10 Dimensions ................................................................16

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 3 of 16
1 Technical specifications
1.1 General
Type : MC 785 CHILLER
Housing : Panel-mounted steel plate
Material : Silver grey steel plate
Dimensions : 217 x 155 x 85mm (whd)
Panel cutout : 208 x 146mm (wh)
Front : Polycarbonate (IP-44)
Temperature range : -40/+50OC per 0.1OC
Supply : 230 Vac; 50/60 Hz (-10/+5%).
Power supplied : 9 VA
Working temperature : -20/+50OC
Storage temperature : -20/+60OC
Working RH : 10/+90 % RH non-condensing
Accuracy : ± 0.5 % of the range
1.2 Front
Displays : 4-digit display for the inlet temperature
4-digit display for the temperature setpoint
4-digit display for the outlet temperature
4-digit display for the capacity
LEDs : High-1 Alarm = Failure high pressure-1 alarm (yellow)
Oil-1 Alarm = Failure oil pressure-1 alarm (yellow)
Low-1 Alarm = Failure low pressure-1alarm (yellow)
High-2 Alarm = Failure high pressure-2 alarm (yellow)
Oil-2 Alarm = Failure oil pressure-2 alarm (yellow)
Low-2 Alarm = Failure low pressure-2 alarm (yellow)
Oil heat delay = Oil heating starting-up-delay active (yellow)
Alarm = General alarm indication (red)
Comp-1 Alarm = Compressor-1 failure (red)
Comp-2 Alarm = Compressor-2 failure (red)
Pump-1 = Pump-1 active (green)
Pump-2 = Pump-2 active (green)
Cool = Regulator in cooling mode (green)
Heat = Regulator in heating mode (green)
Comp-1 = Compressor-1 active (green)
Comp-2 = Compressor-2 active (green)
SeaP-1 = Sea water pump-1 active (green)
SeaP-2 = Sea water pump-2 active (green)
Keys: ON/OFF = On/off key controller
SET = Setpoint push button
PRG = Programming key
+ = Increasing values key
-= Decreasing values key
PRESS SENS = Readout pressure sensors key
CAP. LIMIT = Readout capacity limits key
PUMP 1 / 2 = Pump choice key
COOL / HEAT = Function choice key for cooling/heating mode
RESET ALARM = Alarm reset key

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 4 of 16
1.3 Inputs and outputs
Sensors : Inlet temperature sensor (10K, 2-wire)
Outlet temperature sensor (10K, 2-wire)
HP-2 Pressure sensor-1 PX77 range: 0-25 bar (2-wire 4/20mA output)
OIL-2 Pressure sensor-2 PX77 range: 0-10 bar (2-wire 4/20mA output)
LP-2 Pressure sensor-3 PX77 range: 0-10 bar (2-wire 4/20mA output)
HP-1 Pressure sensor-4 PX77 range: 0-25 bar (2-wire 4/20mA output)
OIL-1 Pressure sensor-5 PX77 range: 0-10 bar (2-wire 4/20mA output)
LP-1 Pressure sensor-6 PX77 range: 0-10 bar (2-wire 4/20mA output)
Note: Pressure sensors need external supply thru SM615 (15Vdc)
Communication: I2C-bus (for LMS-units) (2-wire shielded min. 0.75mm2)
RS485-network-1 (for LMS Analog-out mod.) (2-wire shielded min. 0.75mm2)
RS485-network-2 (for PC) (2-wire shielded min. 0.75mm2)
1.4 On LMS Modules
Modules on the I2C expansion-bus of the MC785-CHILLER 2 controller;
LMS Dig.in-1 : IN-1: Failure chiller pump-1 (NC potential free input contact)
(max. 6 inputs) IN-2: Failure chiller pump-2 (NC potential free input contact)
IN-3: Waterflow-1 contact (NC potential free input contact)
Jumpers IN-4: Waterflow-2 contact (NC potential free input contact)
J2 IN-5: Thermistor INT69-1 (NC potential free input contact)
J1 IN-6: Thermistor INT69-2 (NC potential free input contact)
LMS Dig.in-2 : IN-1: Failure compressor-1 (NC potential free input contact)
(max. 6 inputs) IN-2: Failure compressor-2 (NC potential free input contact)
IN-3: Failure sea water pump-1 (NC potential free input contact)
Jumpers IN-4: Failure sea water pump-2 (NC potential free input contact)
J2 IN-5: Maximum thermostat heating (NC potential free input contact)
J1 IN-6: Cabinet cooling thermostat (NC potential free input contact)
LMS Dig.in-3 : IN-1: Generator load reduction (NC potential free input contact)
(max. 6 inputs) IN-2: Emergency stop (NC potential free input contact)
IN-3: Interlock cooling water failure (NC potential free input contact)
Jumpers IN-4: Maximum compressor capacity (NC potential free input contact)
J2 IN-5: Release startup compressor-1 (NC potential free input contact)
J1 IN-6: Release startup compressor-2 (NC potential free input contact)
LMS Relay-1 : RY1: Start compressor-1 U1/SN (SPDT C-NO-NC, 250Vac/8A non-inductive)
(max. 7 outputs) RY2: Start compressor-2 U2/SN (SPDT C-NO-NC, 250Vac/8A non-inductive)
RY3: Start sea water pump-1 U3/SN (SPDT C-NO-NC, 250Vac/8A non-inductive)
Jumpers RY4: Start sea water pump-2 U4/SN (SPDT C-NO-NC, 250Vac/8A non-inductive)
J2 RY5: Start chiller pump-1 (SPST C-NO, 250Vac/8A non-inductive)
J1 RY6: Start chiller pump-2 (SPST C-NO,250Vac/8A non- inductive)
RY7: Anti-condensation heating (SPST C-NO, 250Vac/8A non-inductive)
LMS Relay-2 : RY1: Alarm circuit A (SPDT C-NO-NC, 250Vac/8A non-inductive)
(max. 7 outputs) RY2: Alarm circuit B (SPDT C-NO-NC, 250Vac/8A non-inductive)
RY3: Supply fluid valve compr-1 (SPDT C-NO-NC, 250Vac/8A non-inductive)
Jumpers RY4: Supply fluid valve compr-2 (SPDT C-NO-NC, 250Vac/8A non-inductive)
J2 RY5: Startup request compr-1 (SPST C-NO, 250Vac/8A non-inductive)
J1 RY6: Startup request compr-2 (SPST C-NO, 250Vac/8A non-inductive)
RY7: Cooling cabinet (SPST C-NO, 250Vac/8A non-inductive)

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 5 of 16
LMS Relay-3 : RY1: Electric heater-1 (SPDT C-NO-NC, 250Vac/8A non-inductive)
(max. 7 outputs) RY2: Electric heater-2 (SPDT C-NO-NC, 250Vac/8A non-inductive)
RY3: Electric heater-3 (SPDT C-NO-NC, 250Vac/8A non-inductive)
Jumpers RY4: Electric heater-4 (SPDT C-NO-NC, 250Vac/8A non-inductive)
J2 RY5: Oil heating-1 (SPST C-NO, 250Vac/8A non-inductive)
J1 RY6: Oil heating-2 (SPST C-NO, 250Vac/8A non-inductive)
RY7: Spare (SPST C-NO, 250Vac/8A non-inductive)
Modules on the local RS485-Network-1 of the MC 785-CHILLER-2 controller;
LMS 4x10K-1: IN-1: 10K NTC Exchanger sensor-1 (10K, 2-wire)
(max.4 inputs) IN-2: 10K NTC Exchanger sensor-2 (10K, 2-wire)
Jumpers IN-3: 10K NTC Exchanger sensor-3 (10K, 2-wire)
J3 2 1 IN-4: 10K NTC Exchanger sensor-4 (10K, 2-wire)
IN-5: spare (RH-sensor-1, 3-wire)
IN-6: spare (RH-sensor-2, 3-wire)
LMS MDR : OUT-1: Compressor-1 0/+10Vdc (Rbmin 10Kohm, programmable)
(max. 4 outputs) OUT-1: Compressor-2 0/+10Vdc (Rbmin 10Kohm, programmable)
Jumpers OUT-1: Sea water pump-1 0/+10Vdc (Rbmin 10Kohm, programmable)
J1 2 3 4 5 6 OUT-1: Sea water pump-2 0/+10Vdc (Rbmin 10Kohm, programmable)
Remarks: = Jumper placed (on),
= Jumper not placed (off)
2 Functional specifications
The MC 785 CHILLER is a control system which brings the water for a heating- or an airconditioning
system to the desired temperature.
The MC 785 CHILLER has two pumps. One of these pumps is always working when the unit is on and
ensures that the water is circulated. The other pump can be selected by pressing the key PUMP 1 / 2
on the front.
The choice for heating or cooling can be made by using the COOL / HEAT key.
For heating, the temperature is regulated by 1 to 4 electric heaters. The heating steps are switched on
or off on the basis of the return temperature. The sequence of the heaters and the maximum capacity
can be adjusted.
For cooling, two compressors are available.
These are regulated by the return temperature.
The sea water pump of each of the compressors is switched on shortly before a compressor goes on.
The different pressures in the compressors are measured and can be viewed on the front when the
PRESS SENS key is pressed.
When the values of one of these pressure sensors are improper, the compressor switches off and an
error-code appears on the display.
The sequence of the compressors and the maximum capacity can be adjusted by means of keys on
the front.
After power-up there is a 60 seconds delay before initialisation of the controller.
After initialisation or switch-on of the controller there is a 30 seconds delay before checking the flow
switches.

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 6 of 16
3Operation
During normal operation the top left-hand display shows the INLET temperature, the top right-hand the
OUTLET temperature, and below left (SETPOINT) shows the OUTLET setpoint temperature.
The display below right (CAPACITY) shows the capacity currently being used for heating/cooling.
3.1 Switching the chiller on and off.
The regulator can be switched on or off by pressing the ON/OFF key.
3.2 Readout of different pressure and temperature sensors.
By using the PRESS SENS key the values of the different pressure sensors will be shown
consecutively in the top left-hand display. With the help of the LEDs next to this display you can
see which sensor value is being shown.
If there is no LED on next to the display then the INLET temperature is shown on the display.
If the PRESS SENS key is then pressed once or more the exchange temperature sensors of the
LMS 4x10K/2xRH unit can be read consecutively. This is indicated by the ‘EC1..4' in the right-
hand display and the value of the sensor in the left-hand display.
3.3 Switching from cooling/heating.
If the COOL/HEAT key is pressed, the regulator will switch from cooling to heating or vice versa.
The LEDs next to the bottom left-hand display indicates whether the regulator is cooling or
heating.
3.4 Changing the temperature setpoint.
When the regulator is cooling the bottom left-hand display shows the current cooling setpoint.
When heating is taking place the heating setpoint is indicated there.
The setpoint can be altered by pressing the SET key. The regulator will now ask for the ‘user
password’. The ‘user password’ can be entered by using the UP and DOWN keys. If it is correct
the setpoint can be changed by pressing the SET key. The setpoint will now start to blink, and
the setpoint can be adjusted with the UP and DOWN keys.
The cooling setpoint can be set at between 5°C and 10 /C, the heating setpoint at between 30°C
and 40 /C. Now if no key is pressed for 30 seconds the setpoint will stop blinking and the new
septoint will become active.
3.5 Changing the chiller pump.
A switch can be made to the other chiller pump by means of the PUMP1/2 key. All compressors
and heaters will be switched off while the regulator goes to the other pump. Then they will turn
themselves on again (with possible delay times). The LEDs next to the bottom left-hand display
indicate which chiller pump is in operation
3.6 Changing the sea pumps mode.
With the help of the sea pumps mode setting (P217) we can choose between two modes
P217=0: Fixed couplings between sea pumps and compressors
Now sea-pump-1 belongs with compressor-1 and sea-pump-2 with compressor-2.
P217=1: Choose for 1 sea pump
Now a choice can be made as to which sea pump will be used. The choice should be
made as follows: First, turn the regulator off with the ON/OFF key. Then use the
COOL/HEAT key to choose which sea pump will be used, then the appropriate LED will
light up. When the choice has been made, the regulator can be turned on again.
3.7 Switching cooling/heating capacity and the sequence of the regulator.
By pressing the CAP.LIMIT key next to the bottom right-hand display the current maximum
heating capacity will be shown. The word ‘HEAT’ will appear in the display above to show that
we are dealing with heating. With the help of the UP and DOWN keys the capacity can be
adjusted.
If the CAP.LIMIT key is pressed once more the heater sequence appears in the display; a
different sequence can be selected with the UP and DOWN keys.
Next, press the CAP. LIMIT key once again and the capacity and the regulating sequence of the
cooling can be changed in a similar way.

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 7 of 16
3.8 Maximum compressor capacity.
If contact input 4 of LMS Dig-in module 3 is closed, then only 1 compressor is active.
3.9 Switching off the carter delay.
By pressing the PRG key and the SET key simultaneously and then entering the service code,
and by then pressing the SET key as confirmation, the carter heating delay will be switched off if
the code is correct. (This operation to be carried out by H&H).
3.10 Readout the counters.
When the PRG key and the PRESS.SENS key are pressed simultaneously the hour and cycle
counters for the compressors, heaters, seawater-pumps and chiller-pumps will be displayed.
The upper left display shows ‘C.1 h’ = compressor-1 hours and the lower left display shows the
counted hours.
The upper right display shows ‘cYcl’ = cycle counts and the lower right display shows the cycle
counter value.
By pressing the PRG key once or more times the following hour and cyle counts will be shown:
C.2 compressor-2 S.1 sea pump-1
H.1 heater-1 S.2 sea pump-2
H.2 heater-2 P.1 chiller pump-1
H.3 heater-3 P.2 chiller pump-2
H.4 heater-4
3.11 Resetting all counters.
When the PRG key and the RESET ALARM key are pressed simultaneously and the service
code is then entered, all the operational hours and the cycle counters are reset to zero.
3.12 Resetting alarms.
As soon as an alarm situation occurs and an error code appears in the temperature display the
alarm can be reset by pressing the RESET ALARM key.
The error code warning remains in the display until the cause of the error has been solved.
3.13 Shifting the generator capacity (reduced generator load).
By closing the digital inlet (LMS dig.in 3 input-1) the generator capacity is decreased by
parameter P232 percent.
3.14 Emergency stop.
By closing the digital inlet (LMS dig.in 3 input-2) the emergency stop function is activated.
Everything is turned off and ‘Egy-‘ and ‘STOP’ appear alternating in the display to indicate this.
3.15 Compressor startup release contacts.
If a compressor wants to startup, the according startup request relay is activated and the
compressor waits for the according release startup compressor input to be closed to startup the
(released) compressor.
4Programming internal parameters
By pressing the PRG key for a few seconds and then entering the service code digit by digit with the
UP, DOWN and SET keys, the internal parameter mode can be entered.
‘P P’ appears in the upper right display while the number of the parameter will appear in the upper left
display.
Using the UP and/or DOWN keys the desired parameter can then be selected.
The lower left display shows the value of the parameter.
By pressing the SET key and the UP or DOWN key at the same time the value can be adjusted.
If no key is pressed for 30 seconds the display will return to the normal operational status.

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 8 of 16
4.1 Parameter table.
No. Description Range Unit Default
Sensor settings
P 01
P 02
Offset inlet temperature sensor-1
Offset outlet temperature sensor-2
-10.0...+10.0
-10.0...+10.0
OC
OC
0.0
0.0
P 10
P 11
P 12
P 13
Value HP2 pressure sensor-1 at 4mA
Value HP2 pressure sensor-1 at 20mA
Offset HP2 pressure sensor-1
Delay factor pressure sensor-1
-10.0...30.0
-10.0...30.0
-10.0...+10.0
0...100
bar
bar
bar
%
0.0
25.0
0.0
10
P 14
P 15
P 16
P 17
Value OIL2 pressure sensor-2 at 4mA
Value OIL2 pressure sensor-2 at20mA
Offset OIL2 pressure sensor-2
Delay factor pressure sensor-2
-10.0...30.0
-10.0...30.0
-10.0...+10.0
0...100
bar
bar
bar
%
0.0
10.0
0.0
50
P 18
P 19
P 20
P 21
Value LP2 pressure sensor-3 at 4mA
Value LP2 pressure sensor-3 at 20mA
Offset LP2 pressure sensor-3
Delay factor pressure sensor-3
-10.0...30.0
-10.0...30.0
-10.0...+10.0
0...100
bar
bar
bar
%
0.0
10.0
0.0
50
P 22
P 23
P 24
P 25
Value HP1 pressure sensor-4 at 4mA
Value HP1 pressure sensor-4 at 20mA
Offset HP1 pressure sensor-4
Delay factor pressure sensor-4
-10.0...30.0
-10.0...30.0
-10.0...+10.0
0...100
bar
bar
bar
%
0.0
25.0
0.0
10
P 26
P 27
P 28
P 29
Value OIL1 pressure sensor-5 at 4mA
Value OIL1 pressure sensor-5 at20mA
Offset OIL1 pressure sensor-5
Delay factor pressure sensor-5
-10.0...30.0
-10.0...30.0
-10.0...+10.0
0...100
bar
bar
bar
%
0.0
10.0
0.0
50
P 30
P 31
P 32
P 33
Value LP1 pressure sensor-6 at 4mA
Value LP1 pressure sensor-6 at 20mA
Offset LP1 pressure sensor-6
Delay factor pressure sensor-6
-10.0...30.0
-10.0...30.0
-10.0...+10.0
0...100
bar
bar
bar
%
0.0
10.0
0.0
50
P 40
P 41
P 42
P 43
P 44
Number extra LMS exchanger sensors
Offset LMS exchanger sensor1
Offset LMS exchanger sensor2
Offset LMS exchanger sensor3
Offset LMS exchanger sensor4
0..4
-10.0...10.0
-10.0...10.0
-10.0...10.0
-10.0...10.0
OC
OC
OC
OC
2
0.0
0.0
0.0
0.0
Heating
P100
P101
P102
Offset first heater
Differentiation first heater
Delay first heater
-10.0...+10.0
0.1...10.0
0...999
OC
OC
Sec.
0.0
1.0
60
P103
P104
P105
Offset second heater
Differentiation second heater
Delay second heater
-10.0...+10.0
0.1...10.0
0...999
OC
OC
Sec.
-1.0
1.0
120
P106
P107
P108
Offset third heater
Differentiation third heater
Delay third heater
-10.0...+10.0
0.1...10.0
0...999
OC
OC
Sec.
-2.0
1.0
180
P109
P110
P111
Offset fourth heater
Differentiation fourth heater
Delay fourth heater
-10.0...+10.0
0.1...10.0
0...999
OC
OC
Sec.
-3.0
1.0
240

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 9 of 16
No. Description Range Unit Default
P120
P121
P122
Minimum adjustable temperature setpoint heater
Maximum adjustable temperature setpoint heater
Heaters present
0.0..+90.0
0.0..+90.0
0 = no, 1 = yes
OC
OC
-
+30.0
+40.0
1
Cooling
P200
P201
Start delay compressors if the regulator has been out
for more than P201 hours.
Regulator out - hours limit
0...100
0...100
hour
hour
8
4
P202
P203
P204
P205
P206
Cool offset-1 (see function flow)
Cool offset-2
Cool offset-3
Cool offset-4
Cool offset-5
-10.0...+10.0
-10.0...+10.0
-10.0...+10.0
-10.0...+10.0
-10.0...+10.0
°C
°C
°C
°C
°C
0.0
0.0
3.0
3.0
6.0
P207
P208
P209
P210
P211
Minimum time that the compressor runs at minimum
capacity
Time in which the frequency of the compressor
increases from 0,0 to 10,0 Volt
Time in which the frequency of the compressor
decreases from 10,0 to 0,0 Volt
Anti shuttle time of compressors
Delay before compressor-2 switches on
0...999
0...999
0...100
0...100
0...999
Sec.
Sec.
Sec.
Min.
Sec.
60
180
15
5
60
P212
P213
High pressure in which the frequency
of the sea pump is zero.
High pressure in which the frequency
of the sea pump is ten.
0...99.9
0...99.9
bar
bar
14.0
19.0
P214 Maximum chill per minute 0.0...10.0 °C 0.2
P215
P217
Offset set point at cooling
Sea pump mode 0 = fixed coupling
1 = 1 sea pump
-15.0...+15.0
0..1
°C
-
1.5
0
Setpoint
P220
P221
Minimum adjustable temperature setpoint cooling
Maximum adjustable temperature setpoint cooling
0.0...+90.0
0.0...+90.0
°C
°C
5.0
12.0
Capacity reduction
P230
P231
P232
Cooling capacity reduction with “Generator load
reduction” input closed
Time in which cooling capacity is reduced with P230
Capacity reduction heating-mode with reduced
generator power
0...100
5...300
0...100
%
Sec.
%
40
20
50

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 10 of 16
No. Description Range Unit Default
Alarm
P300
P301
P302
P303
Minimum temperature alarm sensor-1
Minimum temperature alarm sensor-2
and exchanger sensors (LMS)
Maximum temperature alarm sensor-1
Maximum temperature alarm sensor-2
0...+100.0
0...+100.0
0...+100.0
0...+100.0
°C
°C
°C
°C
5.5
2.0
45.0
45.0
P304
P305
P306
P307
P308
P309
P310
P311
High pressure alarm high pressure sensors
Low pressure alarm low pressure sensors
Low pressure alarm real oil pressure
Delay low pressure alarm real oil pressure
High pressure too low alarm
High pressure too low alarm delay
Water flow alarm delay
Number of flow switches
0...+99.9
0...+99.9
0...+99.9
0...200
0...+99.9
0...200
0...200
1..2
bar
bar
bar
Sec.
bar
Min.
Sec.
-
22.0
2.0
0.7
45
3.0
30
1
2
User password
P400 User password 0...9999 -0000
General
P502
P990
P991
P995
P996
P997
Digital inputs filter time
Network identification number
Log interval
Software version
Serial number
Production date
0.0...5.0
1...250
0...120
-
-
-
seconds
-
minutes
-
-
Year.week
1.0
1
5
-
-
-
4.2 Cooling control operation:
The following function flow diagram is designed to explain the operation of the compressor control:

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 11 of 16
6Sensor calibration
With parameters P1, P2, P41, P42, P43 and P44 the temperature sensors can be calibrated.
If a temperature sensor readout is 0.2/C too high, for example, the offset of the appropriate
temperature sensor should be set 0.2/C lower.
The pressure sensors can be calibrated with parameters P12, P15, P18, P21, P24 and P27.
If a pressure sensor readout is 0.3 bar too low, for example, then the offset of the appropriate pressure
sensor must be set 0.3 bar higher.
In addition, every pressure sensor has a 4mA and a 20mA value setting for setting its range.
For example: The settings for a pressure sensor with a range of 0.00 .... +10.00 bar and an
output of 4...20mA are as follows: The parameter for the value at 4mA must be set
at 0.00, and the parameter for the value at 20mA must be set at 10.00.
7Alarms
An alarm can be caused by:
E1 Temperature sensor-1 inlet defect.
E2 Temperature sensor-2 outlet defect.
E3 Pressure sensor-1 (HP2) defect.
E4 Pressure sensor-2 (OIL2) defect.
E5 Pressure sensor-3 (LP2) defect.
E6 Pressure sensor-4 (HP1) defect.
E7 Pressure sensor-5 (OIL1) defect.
E8 Pressure sensor-6 (LP1) defect.
E10 No contact with LMS extra sensors
E11 Temperature LMS sensor 1 too low
E12 Temperature LMS sensor 2 too low
E15 Temperature LMS sensor-1 defect
E16 Temperature LMS sensor-2 defect
E20 Too low pressure pressure sensor-6
compressor-1
E 21 Too low pressure pressure sensor-3
compressor-2
E22 Too high pressure pressure sensor-4
compressor-1
E23 Too high pressure pressure sensor-1
compressor-2
E24 Too low pressure pressure sensor-5 oil
pressure-1
E25 Too low pressure pressure sensor-2 oil
pressure-2
E26 Too low pressure pressure sensor-4
compressor-1
E27 Too low pressure pressure sensor-1
compressor-2
E30 Inlet temperature lower than outlet temperature
E31 Temperature sensor-1 inlet too low
E32 Temperature sensor-2 outlet too low
E33 Temperature sensor-1 inlet too high
E34 Temperature sensor-2 outlet too high
E40 Cabinet cooling failure
E41 Error waterflowswitch 1
E42 Chiller pump-1 failure
E43 Chiller pump-2 failure
E44 Compressor-1 failure
E45 Compressor-2 failure
E46 Maximum thermostat
E47 INT69-1 failure
E48 INT69-2 failure
E49 Sea pump-1 failure
E50 Sea pump-2 failure
E51 Error waterflowswitch 2
E52 Interlock cooling water fault
E60 Communication error LMS dig-in module-1
E61 Communication error LMS dig-in module-2
E62 Communication error LMS dig-in module-3
E63 Communication error LMS relay module-1
E64 Communication error LMS relay module-2
E65 Communication error LMS relay module-3
The alarm warnings can be seen in the temperature display (top left).
By pressing the RESET ALARM key the alarm relay can be reset.
The error code continues to appear in the display as long as the fault remains.
The alarm LED will also continue to blink.

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 12 of 16
8 Front
Front view of the MC785-CHILLER panel-mounted model, drawing 021773

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 13 of 16
9Connection diagrams
9.1 Connections of MC 785-CHILLER 2 (panel mount), drawing 021774w2.

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 14 of 16
9.2 Principle of LMS modules connections.
Block diagram with I/O and network connections MC 785-CHILLER 2 drawing 071782w1

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 15 of 16
9.3 Connections of LMS Modules.

User manual Document no. : 032189 Version : V1.5
MC 785 CHILLER-2 Customer: Heinen & Hopman Page: 16 of 16
10 Dimensions
Dimensions MC 785 panel-mounted, drawing 961271
Dimensions LMS modules:
-.-.-.-.-.-.-.-.-.-
@