VDH Products MC 785-ECU User manual

Description: MC 785-ECU Heinen & Hopman
With AUTO-override function Doc.no.: 031221
Type: USER MANUAL Number of pages: 12 Version: V3.3
File: DO001525.HND
Software: MC785ECU Version: V3.02 By: BJB Date: 03-11-2008
VDH Products BV Initialled: File: Doc'03
MC 785-ECU Heinen & Hopman
Wall and panel mounting
User Manual

User manual Document no. : 031221 Version : V3.3
MC 785-ECU Client: Heinen & Hopman Page: 2 of 12
The information contained in this document is assumed to be accurate. However, VDH Products BV accepts
no liability for eventual mistakes and errors and reserves the right to change this document without notice.
Table of contents
1Technical specifications ........................................................3
2Functional specifications .......................................................4
3 Operation ...................................................................4
4 Programming internal settings ...................................................5
5 Sensor calibration ............................................................6
6 Alarms .....................................................................6
7Front view ...................................................................7
8Connection diagrams ..........................................................9
9Dimensions ................................................................11

User manual Document no. : 031221 Version : V3.3
MC 785-ECU Client: Heinen & Hopman Page: 3 of 12
1 Technical specifications
General
Type : MC 785-ECU
Wall-mounting:
Housing : Grey plastic
Material : Polystyrol 454h KG 2 natur BASF
Dimensions : 213 x 180 x 85mm (bhd)
Front : Polycarbonate (IP-44)
Panel-mounting:
Housing : Steel plate panel
Material : Steel sprayed silver grey
Dimensions : 217 x 155 x 85mm (bhd)
Panel cutout : min. 208 x 146mm (bh)
Front : Polycarbonate (IP-44)
Range : -40/+50°C per 0.1°C
-500/+10.000 Pa per 1 Pa (settings thru parameters)
0/+100% per 1%
Power supply : 230 Vac; 50/60 Hz (-10/+5%) or else see product sticker.
Power consumption : 9 VA
Operation temperature : -20/+50°C
Storage temperature : -20/+60°C
Operation RH : 10/+90 % RH non-condensing
Accuracy : ± 0.5 % of the range
Front
Display : 4-digit digital display for temperature readout
4-digit digital display for air pressure readout
4-digit digital display for setpoint readout
4-digit digital display for emission level readout
LEDs : °C = Set point on base of temperature
Pa = Set point on base of air pressure
% = Set point on base of percentages
AUTO = Automatic control
MAN = Manual control
Keys : ON/OFF = On/off key controller
T = Control on base of temperature
P = Control on base of air pressure
- = Down key
+ = Up key
AUTO/MAN. = Automatic/manual operation key
Inputs and outputs
Sensors : Temperature sensor ......................(10k NTC, 2-leader)
Pressure sensor input .....................(4/+20mA, 3-leader)
Analog output : 0/+10 Vdc output .............................. (Rb = 10 k)
Digital input : Dig.in-1 External Fan function ............ (NC1, closed = normal)
Dig.in-2 External AUTO-override ...... (NC2, closed = auto mode)
Communication : RS485 Network .. (A, B, GND 2xtwisted-pair shielded min. 0,5mm2)
Relay : RY1 Alarm ...............(C/NO/NC, 250Vac/16A non-inductive)
C-NO is normally closed; C-NC is closed in case of alarm
RY2 On/Off (Freq.Contr. Direct) . (C/NO, 250Vac/16A non-inductive)
RY3 On/Off (Freq.Contr. Reverse)(C/NO, 250Vac/16A non-inductive)

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WARNING:
First switch-off the MC 785-ECU controller, in case there’s work to be done on or around the fans.
2 Functional specifications
The MC 785-ECU can control a 0/10 Vdc PI output on temperature or air pressure base.
In the MANUAL mode the output can be set manually in a fixed position. In the AUTOMATIC mode it
can be adjusted on base of temperature or pressure.
Adjustments to the settings of the range and the P(I) are made by means of the internal parameters.
3Operation
During normal operation the left-hand display shows the measured temperature and the right-hand
display the measured air pressure. The output display shows the output level of the analogue output.
Switching the thermostat on and off.
By pressing the ON/OFF key the thermostat is turned on or off. If the thermostat is in the OFF
position, the control function is off and OFF is shown in the display.
Relay 2 is active when the controller is on and out when the controller is off.
Changing the set point.
Press the SET key. The set set point will blink in the display. By pressing the UP or DOWN keys
the set point can be changed. After pressing the SET key again the new set point will be
accepted.
Choice of temperature/pressure control
By pressing the Tor P key, a choice can be made between temperature or pressure control. If
the LED above the Tkey is lit, the control is on the base of temperature. The set point display
shows the temperature set point again and theC LED next to the set point display is illumi-
nated. If the LED above the Pkey is lit, the control is done on the base of air pressure. The set
point display shows the pressure set point again and the Pa LED next to the set point display
will be illuminated.
Choice of manual and automatic mode.
The MC 785-ECU normally operates in Automatic-mode. If the controller is in the manual mode
and the digital input contact-2 (AUTO-Override) is closed, than the controller switches to
automatic and stays in that mode until it’s switches manual to the manual mode. It doesn’t
matter in what position the digital input contact-2 is. If the controller is in the automatic mode,
the LED ‘Automatic’ next to the OUTPUT display will light on to indicate the AUTO mode and
the controller is automatically controlled by pressure or temperature. The choice and adjust-
ment of temperature/pressure-settings is described as above.
If the LED ‘Manual’ is on than the output level of the analogue output can be adjusted manually.
On the set point display the required level can be set by pressing the SET key and then
pressing the UP and DOWN keys to set the required value.
In the manual position (if P41=1) the rotation direction of the fan can be changed by pushing the
UP + DOWN keys together for more than 2 seconds. In the reverse position relay 3 is on
instead of relay 2. The reverse position is shown by a negative value on the output display.
The external fan switch (dig.in-1) can be used to reverse the fan rotation (as P41=2) or to stop
the fan (as P41=3), this disables the manual UP + DOWN key-function.
By pressing the AUTO/MAN key a choice can be made between automatic and manual mode.

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Resetting an alarm.
As soon as there is an alarm situation and an error message appears on the display. The alarm
can be reset by pressing any key.
The error message remains visible on the display until the cause of the error is solved.
If the control is switched off by the alarm, it is automatically switched on again when the
temperature is in the control range again.
4Programming internal settings
By pressing the Tand Pkeys simultaneously for more than 5 seconds, it is possible to enter the
Internal Parameters. A ‘P’ followed by a digit will appear on the display. The value of the parameter is
shown on the set point display. Using the UP or DOWN keys, it is possible to find the required
parameter.
When the required parameter has been selected, the value can be adjusted by pressing the SET key
first and then the UP or DOWN keys. The changed setting can be confirmed by pressing the SET key.
If no key is pushed for 30 seconds, the display will return to it’s normal status.
Parameter table.
Nr Description Range Unit Default
P 01
P 02
P 03
P 04
Offset temperature sensor
Range pressure sensor
Offset pressure sensor
Resolution temperature 0 = per 0.1OC , 1 = per 1OC
-15,0..+15,0
100..10.000
-500..+500
0..1
OC
Pa
Pa
-
0,0
250
0
0
P 10
P 11
P 15
P 16
P 18
Proportional band temperature
Integration time temperature (100 = only P)
Proportional band pressure
Integration time pressure (6000 = only P)
Type P(I) control 0 = normal Temperature lower, Pressure raise
1 = reverse Temperature raise, Pressure lower
0.1..+15,0
1..100
100..10.000
10..6000
0..1
OC
Minutes
Pa
Seconds
-
5,0
15
500
30
0
P 20
P 21
P 22
P 23
P 24
Minimum temperature set point
Maximum temperature set point
Minimum pressure set point
Maximum pressure set point
Alarm mode 0 = No alarm
1 = Alarm only in auto mode
2 = Alarm in auto and manual mode
-40,0..+50,0
-40,0..+50,0
0..10.000
0..10.000
0..2
OC
OC
Pa
Pa
-
+1,0
+50,0
0
10.000
1
P 30
P 31
P 32
P 33
P 34
P 35
P 36
P 37
P 38
Minimum temperature alarm
Maximum temperature alarm
Minimum pressure alarm
Maximum pressure alarm
Output level at minimum temp. alarm
Output level at maximum temp. alarm
Output level at minimum pressure alarm
Output level at maximum pressure alarm
Output level at sensor failure
-40,0..+50,0
-40,0..+50,0
-500..10.000
0..10.000
0..100
0..100
0..100
0..100
0..100
OC
OC
Pa
Pa
%
%
%
%
%
-40,0
+50,0
0
10.000
20
100
100
20
80

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P 40
P 41
P 45
P 46
P 47
P 48
Delay time for the rotation direction of the fan.
Function external contact
0 = None
1 = Manual rotation direction of fan with UP + DOWN keys
2 = Autom. rotation direction of fan with external contact
3 = Fan off with external contact
Delay time min. temperature alarm
Delay time max. temperature alarm
Delay time min. pressure alarm
Delay time max. pressure alarm
0..240
0..3
0..999
0..999
0..999
0..999
Seconds
-
Seconds
Seconds
Seconds
Seconds
60
0
0
0
0
0
P 90
P 91
P 95
P 96
P 97
Network number
Log interval
Software version no.
Serial number
Production date
1..250
0..120
-
-
-
-
Minutes
-
-
Year/Wk
1
0
-
-
-
5Sensor calibration
The sensors can be calibrated with the parameters P 01 and P 03. If the temperature sensor register
0.2°C too much, for example, then parameter P1 should be set at -0.2°C.
6Alarms
The alarm relay is energized in normal operation and will de-energized when an alarm occurs (fail
safe alarm). This means that an alarm is given if the power supply fails. During an alarm the alarm
warning in the display will blink. Depending on the alarm and the Internal Parameters, the output will
be set at a certain output level.
An alarm can be caused by:
- Sensor failure (E1 or E2).
- Sensor measures a minimum or maximum alarm (t.LO, t.HI, P.LO, P.HI).
NOTE: Minimum and maximum alarms are only detected 4 minutes after turning on or after
power failure.
The alarm relay can be reset by pressing a key. The error message remains in the display as long as
the error exists.
Temperature alarm: t.LO = Minimum temperature alarm
t.HI = Maximum temperature alarm
Pressure alarm: P.LO = Minimum pressure alarm
P.HI = Maximum pressure alarm
Sensor failure: E1 = Temperature sensor defective
E2 = Pressure sensor defective

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7 Front view
Front view from MC785-ECU wall-mounting, drawing 001214

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Front view from MC785-ECU panel-mounting, drawing 002584

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8Connection diagrams
Connection diagram for MC785-ECU wall-mounting, drawing 001539w7

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Connection diagram for MC785-ECU panel-mounting, drawing 002583w7
RS 485:

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9Dimensions
Dimensions wall-mounted with door, drawing 941402

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Dimensions panel-mounted model, drawing 961271
-.-.-.-.-.-.-.-.-.
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