VDH MC 885-SDHL User Manual
MC 885-SDHL
Spray/Dry High/Low Thermostat
VDH doc: 180146 Version: v1.0 Date: 05-02-2018
Software: 110365_MC 885 SDHL File: Do180146.wpd Range: -50/+300C per 1C
* Working principle
The MC 885 SDHL is a thermostat for controlling >on/off= burners with >high/low= burner control by means of
relay contacts. In addition to this, modulating control is also possible. The thermostat supports 2 mode=s
(mode S and mode D), each having their own setpoint. It is possible to alternate between the mode=s using
a digital input. When applied to a spray booth regulation function, mode S can be used for spraying and
mode D for drying. These modes can be optionally be used in other applications; for example, mode S for
night and mode D for day.
The working principle of the controller is determined by the parameter settings. The controller can control
using 1 or 2 mode=s(/setpoints), with 1 or 2 sensors, where appropriate depending on the current mode (S
or D).
The basic regulation function supports the control functions >burner on=, >burner low= and >burner high= as
shown in the functional flow figure. One of these control functions can be set for each relay. If a burner has
to be controlled with a change-over relay contact >burner high/low=, control function >burner high= can be
used for this on RY2 or RY3.
The measurement and control range are both -50 to 300 C, with a readout per 1 C. The control range can
be reduced using the parameter setting. The top display normally gives the measured room temperature
and the bottom display gives the active setpoint.
In addition to the basic regulation function, the controller also has a minimum and maximum alarm detection
and a maximum limit. The temperature and mode=s at which the alarms and limit should work can be set via
the parameters. The desired action when an alarm or limit is triggered can also be set.
If the controller detects a sensor failure, the regulation function stops, an error message appears in the
display and the alarm relay function becomes active.
The controller also has a configurable analogue output, power-up control delay, buzzer, operate/parameter
passwords and an optional RS485 network connection (for ALFANET or Modbus).
The working principle of these functions is described later in this manual.
* Operation
The thermostat is operated using seven buttons on the front:
ON/OFF - switches the controller on and off with LED indicator
SETP. - select, view/change the setpoint value
SENS. - view the values from the individual temperature sensors
PRG - access to the internal parameters
RESET ALARM - reset button for resetting alarms with LED indicator
UP - increase the set value (setpoint/parameters)
DOWN - reduce the set value (setpoint/parameters)
* Switching the controller on and off
The LED above the ON/OFF button shows whether the controller is on or off.
Pressing the ON/OFF button (for at least 1 second) switches the controller on or off. If the thermostat is
switched off, then all the displays are blank and its regulating function is disabled. If the thermostat is
switched on, the room temperature is usually displayed in the top display and the active setpoint in the
bottom display. If a controller delay has been defined after a power interruption then the time remaining is
shown in the lower display (blinking).
* View the individual setpoints
In normal operating mode, the room temperature is shown in the top display (default). If necessary, this can
be changed using parameter P80.
The LED=s next to the SENS. Button indicates which temperature is displayed on the top display: >I= =
Sensor-1 (room temperature), >II= = Sensor-2 (channel temperature), >I= and >II= both on = average of Sensor
1 and Sensor 2. The other temperatures (if present and used) can be displayed by now pressing the SENS
button one or more times. A blinking LED indicates that another temperature is being displayed as normal.
A few seconds after releasing the SENS. button or by pressing the ON/OFF button, the normal room
temperature (P80) will reappear in the display.
* View the individual setpoints
The LED=s next to the SETP. button indicate which setpoint is active. This is shown on the bottom display.
The other setpoint will be displayed (if set using P01) by pressing the SETP. button. A blinking LED
indicates that the inactive setpoint is being displayed.
A few seconds after releasing the SETP. button or by pressing the ON/OFF button, the active setpoint will
reappear in the display and the corresponding LED will be illuminated continuously.
* Changing setpoints
Press (if necessary) the SETP. button until the desired setpoint appears in the display and release the
SETP. button. The setpoint can now be changed by pressing the SETP. button at the same time as the UP
or DOWN buttons. A few seconds after releasing the buttons or by pressing the ON/OFF button, the normal
room temperature (P80) will reappear in the display.
* Mode display
The LED=s mode S and mode D next to the top display indicate the active mode of the controller.
The LED (Max. Limit) indicates whether a maximum limit is active.
The LED=s Out-1, Out-2 and Out-3 show the relays that are active.
* Setting internal parameters
The functioning of the controller can be configured using the internal parameters. By pressing the PRG and
DOWN buttons simultaneously, you can access the internal programming menu. A letter >P= followed by a
number (= parameter number) will appear in the top display. The UP and/or DOWN buttons can be used to
look up the desired parameter.
The value of this parameter is shown in the lower display. This value can be adjusted by pressing the SETP.
button at the same time as the UP or DOWN buttons.
A few seconds after releasing the buttons or by pressing the ON/OFF button, the controller returns to the
normal operating mode.
* Parameter table
No. Description
Range
Per Unit Default
01
02
03
04
Dual mode (mode S and mode D) (0 = no, 1 = yes)
(for P01 = no, only mode S)
Channel sensor present (0 = no, 1 = yes)
In mode S, control on
1 = Room temperature
2 = Channel temperature (room temperature if P02 = 0)
3 = Lowest sensor temperature
4 = Highest sensor temperature
5 = Average sensor temperature
In mode D, control on
1 = Room temperature
2 = Duct temperature (room temperature if P02 = 0)
3 = Lowest sensor temperature
4 = Highest sensor temperature
5 = Average sensor temperature
0 1
0 1
1 5
1 5
-
-
-
-
-
-
-
-
0
0
1
1
10
11
Room sensor offset
Channel sensor offset
-15 +15
-15 +15
0.1
0.1
C
C
0.0
0.0
15
16
Minimum adjustable setpoint
Maximum adjustable setpoint
-50 300
-50 300
1
1
C
C
0
+100
20
21
24
25
26
27
28
29
32
33
34
35
36
37
Burner on differential
Burner on offset
Burner low differential
Burner low offset
Burner low only together with >burner on= (0 = no, 1 = yes)
Burner low modulating control (0 = no, 1 = yes)
Burner low duty cycle (for modulating control)
Burner low cycle time (for modulating control)
Burner high differential
Burner high offset
Burner high only together with >burner on= (0 = no, 1 = yes)
Burner high modulating control (0 = no, 1 = yes)
Burner low duty cycle (for modulating control)
Burner low cycle time (for modulating control)
0.1 15
-50 +50
0.1 15
-50 +50
0 1
0 to 1
0 100
5 240
0.1 15
-50 +50
0 1
0 1
0 100
5 240
0.1
0.1
0.1
0.1
-
1
1
0.1
0.1
-
1
1
C
C
C
C
-
%
s
C
C
-
%
s
0.5
+0.5
0.1
-8
1
0
50
60
0.1
-10
1
0
50
60
40
41
42
Relay 1 function
0 = None
1 = Burner on
2 = Burner low
3 = Burner high
4 = Monitor alarm
5 = Control alarm
Relay 2 function
Relay 3 function
0 5
0 5
0 5
1
3
4
45
46
47
48
Analogue output function
0 = None
1 = Room temperature
2 = Channel temperature (room temperature if P02 = 0)
3 = Lowest sensor temperature
4 = Highest sensor temperature
5 = Average sensor temperature
6 = Control temperature
7 = Spraying setpoint
8 = Drying setpoint
9 = Control (= active) setpoint
Analogue output voltage range
0 = 0..5Vdc
1 = 0..10Vdc
Minimum voltage (0V) at temperature
Maximum voltage (P736) at temperature
0 9
0 1
-50 300
-50 300
-
-
1
1
-
-
C
C
0
0
0
100
50 Minimum alarm detection on
0 7 - - 0
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