VDH MC 785D Manual de usuario

Description: MC 785D Thermostat Doc.nr.: 021171

Type: MANUAL Number of pages: 20 Version: V1.0

File: Do021171 MC785D 0-100'C v10 EN.wp8

Software: MC785D1 (0-100OC) V1.00 By: BJB Date: 06-06-2002

VDH Products BV - Roden - Holland Signed: File: Doc'02

MC 785D

0/+100°C

Operating Manual

wall and panel mounting

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 2 of 20

The information contained in this document is assumed to be accurate. However VDH Products BV accepts

no liability for eventual mistakes or errors and has the right to change this document without notice.

Table of contents

1 Technicalspecifications. .................................................... 3

2 Functionalspecifications..................................................... 4

3 Controlofthethermostat. ................................................... 5

4 Programminginternalsettings. ............................................... 6

5 Operationrelayoutputs. .................................................... 9

6 Sensorcalibration......................................................... 10

7 Alarms. ................................................................ 10

8 AdvancedProgramming.................................................... 11

9 Frontviews.............................................................. 16

10 Connectiondiagrams. ..................................................... 17

11 Dimensions.............................................................. 19

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 3 of 20

1 Technical specifications.

General

Type : MC 785D

Wall mounting:

Housing : Grey plastic

Material : Polystyrol 454h KG 2 natur BASF

Dimensions : 213 x 180 x 85mm (whd)

Front : Polycarbonate (IP-44)

Panel mounting:

Housing : Steel plate panel

Material : Steel in silvergrey

Dimensions : 217 x 155 x 85mm (whd)

Panel cutout : min. 208 x 146mm (wh)

Front : Polycarbonate (IP-44)

Range : 0/+100C per 0,1C

Supply : 230 Vac; 50/60 Hz (-10/+5%).

Used power : 9 VA

Store temperature : -20/+60C

Operation temperature : -20/+50C

Operating rel. humidity : 10/+90 % RH not condensing

Accuracy : ± 0,5 % of the range

Front

Display : 4-number digital display for temperature read-out

4-number digital display for temperature setpoint

LED : F1 = LED Thermostat 1 active

F2 = LED Thermostat 2 active

F3 = LED Thermostat 3 active

F4 = LED Thermostat 4 active

= LED Night mode active

= LED Alarm active

S1 = LED Setpoint 1 in display

S2 = LED Setpoint 2 in display

S3 = LED Setpoint 3 in display

S4 = LED Setpoint 4 in display

Keys : ON/OFF = On/Off key controller

SETP = Setpoint push button

= Up key

= Down key

PRG = Program key

SENS = Sensor read-out key

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 4 of 20

In- and outputs

Sensors : Temperature sensor 1 (Pt-100, 3-wire to DIN/IEC 751)

Temperature sensor 2 (Pt-100, 3-wire to DIN/IEC 751)

Temperature sensor 3 (Pt-100, 3-wire to DIN/IEC 751)

Temperature sensor 4 (Pt-100, 3-wire to DIN/IEC 751)

Digital inputs : Night offset input (potential free input contact)

External alarm input (potential free input contact)

Analog output : 2x 0/+10Vdc, Rbmin 10Kohm, programmable.

Relay outputs : RY1 Alarm (C/NO/NC, 250Vac/10A not inductive)

Normally C-NO is closed, at alarm C-NC is closed.

The next relays have a central common;

RY2 Relay 2 programmable (NO, 250Vac/10A not inductive)

RY3 Relay 3 programmable (NO, 250Vac/10A not inductive)

RY4 Relay 4 programmable (NO, 250Vac/10A not inductive)

RY5 Relay 5 programmable (NO, 250Vac/10A not inductive)

2 Functional specifications.

To the MC 785D thermostat a maximum of four temperature sensors can be connected. As more

than one sensor is set active the MC785D controls on the average temperature of these sensors.

A maximum for four different setpoints can be programmed.

The MC785D thermostat has standard functions from 1 thermostat with 1 setpoint and 1 relay output

until 4 thermostats with 4 setpoints and 4 relay outputs. Also two-, three- or four-steps thermostat with

one setpoint available.

The MC 785D has the control functions cooling or heating. Also has the controller an alarm relay,

which becomes active as soon as the alarm levels are exceeded, a sensor is broken or the external

alarm input is closed.

The MC 785D has two analog outputs with a range of 0/+10Vdc. The function of these outputs can be

programmed as measuring signal, setpoint signal or a P(I) control for the cooling or heating.

The controller has two digital input contacts. The first contact is used as night offset input, the second

contact as external alarm.

The above mentioned settings are made via the Internal Parameters.

To allow also other combinations between setpoints, sensor and relays, there is the Advanced

Programming. This mode is only advisable for advanced users.

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 5 of 20

3 Control of the thermostat.

Normally the displays show the measured temperature and the selected setpoint.

Switching the thermostat on and off.

With the ON/OFF key the MC 785D can be switched on and off. Is the thermostat switched off,

all displays are off. No control function is active.

Select and change temperature setpoint.

With the UP and DOWN keys the desired setpoint can be selected. The LED's next to the

setpoint display indicate which setpoint is shown.

By pushing the SETPOINT key, the setpoint starts flashing. With the UP and DOWN keys the

setpoint can be changed. By pressing the SETPOINT key again, the new setpoint is accepted.

Read-out and switching sensors on and off.

By pressing the SENS key the temperature of the first sensor is shown in the upper display.

The lower display shows the number of the sensor and of the sensor is switched on or off.

'S1on' means that the temperature of sensor 1 is shown and that the sensor is switched on.

Sensors that are switched on are used for the control, switched off sensors not. If more sensors

for a thermostat are switched on, the control is based on the average of those sensors.

If during the read-out of a sensor is pressed on the SETP key, a sensor can be switched on or

switched off.

By pressing the SENS key once again, the next sensor is shown. After all sensors are shown,

the average measured temperature and the setpoint are shown in the display.

Reset the alarm.

As soon as an alarm situation occurs and an error message appears on the display can, by

pressing the RESET ALARM key, the alarm be reset.

The error message remains in the display, until the cause of the error is solved.

Day/night input.

If the NIGHT input is closed, the MC 785D turns to the night mode. The NIGHT LED will light.

The setpoints are increased with the night offset.

External alarm input.

If the external alarm input is closed, an alarm message “FE” appears in the display. The alarm

relay is activated. By pressing the RESET ALARM key, the alarm be reset. The error message

remains in the display, until the cause of the error is solved.

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 6 of 20

4 Programming internal settings.

By pressing the RESET ALARM and SENS key simultaneously for more than 5 seconds, the Internal

Parameter menu is entered. The temperature display shows a P with a number. With the UP and

DOWN key the desired parameter can be selected.

The setpoint display shows the value of the parameter. By pressing the SETPOINT key

simultaneously with the UP or DOWN key, the value can be adjusted.

The parameter table shows the normal programming functions of the thermostat. It is possible to

make other combinations between sensors, setpoints and relays. For these advanced programming

function please see chapter 8 'Advanced Programming'.

If during 30 seconds no key is touched, the display returns to the normal operating mode.

Parameter table.

Number Description Range Value Default

Function of the thermostat

P 01 Function thermostat

0 = 1 setp, 1 relay (D)

1 = 1 setp, 2 relay (D21)

2 = 2 setp, 2 relay (D22)

3 = 1 setp, 3 relay (D31)

4 = 3 setp, 3 relay (D33)

5 = 1 setp, 4 relay (D41)

6 = 4 setp, 4 relay (D44)

0..6 - 0

Settings of the sensors

P 11

P 12

P 13

P 14

P 15

P 16

P 17

P 18

Sensor 1

0 = absent

1 = present

Sensor 2

Sensor 3

Sensor 4

Offset temp. sensor 1

Offset temp. sensor 2

Offset temp. sensor 3

Offset temp. sensor 4

0..1

-10..+10

C

0.0

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 7 of 20

Number Description Range Value Default

Setting of the relays

P 21

P 22

P 23

P 24

P 25

P 26

P 27

P 28

P 29

P 30

P 31

P 32

Function relay 2

0 = cooling

1 = heating

Differential relay 2

Offset relay 2

Function relay 3

Differential relay 3

Offset relay 3

Function relay 4

Differential relay 4

Offset relay 4

Function relay 5

Differential relay 5

Offset relay 5

0..1

0.1..15.0

-15..+15

0..1

0.1..15.0

-15..+15

0..1

0.1..15.0

-15..+15

0..1

0.1..15.0

-15..+15

C

0.5

0.0

0.5

0.0

0.5

0.0

0.5

0.0

Setting of the alarm

P 41

P 42

P 43

P 44

P 45

P 46

P 47

P 48

P 49

Type temperature alarm

0 = No alarm

1 = Absolute alarm

2 = Relative to setpoint

Minimum alarm temperature

Maximum alarm temperature

Minimum alarm delay

Maximum alarm delay

Temperature control off

during minimum alarm

Temperature control off

during minimum alarm

Temperature control off

if all sensors at fault

Control off during external

alarm

0..2

0..+100

0..99

0 = no

1 = yes

0 = no

1 = yes

0 = no

1 = yes

0 = no

1 = yes

C

minutes

0.0

+100.0

Display and setpoint

P 51

P 52

P 53

P 54

P 55

Minimum setpoint value

Maximum setpoint value

Read-out above -10C per

1C

Read-out below -10C per

1C

Offset night shift

0.0..+100.0

0 = no

1 = yes

0 = no

1 = yes

-15..+15

C

0.0

+100.0

0.0

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 8 of 20

Number Description Range Value Default

Setting analog outputs

P 61

P 62

P 63

P 64

P 65

P 66

P 71

P 72

P 73

P 74

P 75

P 76

Function analog output 1

0 = Average control temp.

1 = Setpoint

2 = P(I) cooling

3 = P(I) heating

0 V out at

10 V out at

Proportional band

Offset prop. band

Intergral value

(999 gives only P)

Function analog output 2

0 = Average control temp.

1 = Setpoint

2 = P(I) cooling

3 = P(I) heating

0 V out at

10 V out at

Proportional band

Offset prop. band

Intergral value

(999 gives only P)

0..3

-100..+100

0.1..15

-15..+15

1..999

0..3

-100..+100

0.1..15

-15..+15

1..999

minutes

0.0

+100.0

1.0

0.0

999

0.0

+100.0

1.0

0.0

999

Production details

P 91

P 92

P 93

Software version number

Serial number

Production date

year/wk

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 9 of 20

5 Operation relay outputs.

Function selection of the thermostat.

With parameter P 01 the function of the thermostat is selected.

0 (D) = 1-stage thermostat with one setpoint and one relay output.

1 (D21) = 2-stage thermostat with one setpoint and two relay outputs.

2 (D22) = 2 thermostats each with his own setpoint and relay output.

3 (D31) = 3-stage thermostat with one setpoint and two relay outputs.

4 (D33) = 3 thermostats each with his own setpoint and relay output.

5 (D41) = 4-stage thermostat with one setpoint and two relay outputs.

6 (D44) = 4 thermostats each with his own setpoint and relay output.

All these thermostats control on the average temperature off the active sensors.

Operation of the cooling and heating.

For each relay the function cooling or heating can be programmed.

The cooling switches on if the temperature is higher than the setpoint + offset cooling +

differential cooling and switches off if the temperature is below setpoint + offset cooling.

The heating switches on if the temperature is lower than the setpoint + offset heating -

differential heating and switches off if the temperature is above setpoint + offset heating.

Operation of the alarm.

A selection can be made between no alarm, absolute alarm and relative alarm (P 41).

At an absolute alarm an alarm message will follow as soon as one of the active sensor exceeds

the alarm levels. The time delay prevents that an alarm will follow if e.h. the door of the cold

room is opened shortly.

The relative alarm are linked to the setpoint. A relative maximum alarm follows if one of the

active sensors has a temperature which is higher than setpoint + maximum alarm

temperature, taking the time delay into account. A relative minimum alarm follows if one of the

active sensors has a temperature which is lower than setpoint - minimum alarm temperature,

taking the time delay into account.

Display and setpoint.

The range over which the setpoint can be set, can be limited with parameter P 51 and P52.

Also a read-out per 0,1°C or per 1°C can be selected.

Operation Manual Document nr. : 021171 Version : V1.0

MC 785D 0/+100OC Client : General Page : 10 of 20

6 Sensor calibration.

With the parameters P15 to P18 the temperature sensors can be calibrated. Indicates temperature

sensor 1 e.g. 0,2°C too much, the offset (P 15) should be set at -0,2°C.

7 Alarms.

In normal position the alarm relay is on and drops during alarm. This to give an alarm if there is a

power failure. During alarm the alarm LED on the front flashes. Depending on the settings of the

Internal Parameters the control will stop or continue.

An alarm can be caused by:

Temperature alarm : tLO = Minimum alarm temperature

tHI = Maximum alarm temperature

External alarm : FE = External alarm

Sensor failure : F1 = No Temperature sensor on Thermostat-1

F2 = No Temperature sensor on Thermostat-2

F3 = No Temperature sensor on Thermostat-3

F4 = No Temperature sensor on Thermostat-4

E1 = Temperature sensor 1 broken

E2 = Temperature sensor 2 broken

E3 = Temperature sensor 3 broken

E4 = Temperature sensor 4 broken

EA = All control sensors at fault

By pressing the RESET ALARM key, the alarm relay is reset. The error message will remain in the

display until the alarm is solved. Also the alarm LED will remain flashing.

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