VDH MC3-SC User manual

Description:
MC3
-
SC Stepped Controller
Pages:
45
Doc. no.
140744
Type:
Manual
By:
BVDB
Version:
1.
3
File:
Do140744 MC3
-
SC Step Control V13
EN.docx
Initials:
Date:
1
0
-
0
5
-
2016
VDH
Products BV
MC3
-
SC Manual
Step controller

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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Contents
1Functional specifications ................................................................................................................................ 4
2Operation ............................................................................................................................................................. 5
2.1 General......................................................................................................................................................... 5
2.2 Standby mode............................................................................................................................................ 5
2.3 Switching the controller off.................................................................................................................... 7
2.4 Turning the controller on ........................................................................................................................ 7
2.5 Screen layout ............................................................................................................................................. 9
2.5.1 Settings button................................................................................................................................. 9
2.5.2 Login symbol...................................................................................................................................10
2.5.3 Standby button...............................................................................................................................10
2.5.4 Control data for regulating the compressors.........................................................................10
2.5.5 Control data for regulating the condensers............................................................................10
2.5.6 Active compressor steps..............................................................................................................11
2.5.7 Compressor status overview.......................................................................................................11
2.5.8 More/less power.............................................................................................................................11
2.5.9 Condenser status overview .........................................................................................................11
2.6 Compressor service................................................................................................................................12
2.7 Troubleshooting ......................................................................................................................................13
2.8 Controller settings..................................................................................................................................15
2.9 Thermostat function..............................................................................................................................17
3Parameters........................................................................................................................................................18
4Explanation of the parameters....................................................................................................................22
4.1 Compressor section...............................................................................................................................22
4.2 Condenser part........................................................................................................................................23
4.3 Temperature sensors.............................................................................................................................23
4.4 Additional settings..................................................................................................................................24
4.5 Pressure sensors ....................................................................................................................................24
4.6 Pressure alerts ........................................................................................................................................25
4.7 External setpoints...................................................................................................................................25

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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4.8 Thermostat...............................................................................................................................................25
4.9 Production data.......................................................................................................................................26
5Hardware configuration .................................................................................................................................27
6Alerts...................................................................................................................................................................33
7Functional flow.................................................................................................................................................34
7.1 How the P band works on the suction side (compressor side)...................................................34
7.2 Overview of the functional flow for 4 compressors when stepping compressor levels up
and down...................................................................................................................................................34
7.3 Overview of the functional flow for a compressor with 5 cylinders...........................................35
7.4 How regulation works for a compressor with unequal steps......................................................35
8Summary versions...........................................................................................................................................38
9Views ...................................................................................................................................................................38
10 Connection diagrams......................................................................................................................................40
11 Dimensions........................................................................................................................................................45

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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1Functional specifications
The MC 3-SC is an 8-level stepper controller than can regulate a maximum of 8 compressors and 8
condenser fans up and down, based on the measured suction and discharge pressures and the
active setpoints.
There are two options for regulating up and down using the controller:
Compressor regulation: On/off switching
With of without valve lift (multi-stage compressor) or
frequency controlled.
Condenser regulation: On/off switching or frequency-controlled.
The controller can also decide which compressor or condenser should be switched on or off,
depending on the total number of operating hours, or based on capacity.
Compressors and condensers can also be removed from the controller, e.g. for maintenance or
faults.
Minimum and maximum pressure alerts, minimum and maximum pressure faults, minimum and
maximum temperature alerts and minimum and maximum temperature faults can be set for
monitoring the controller.
All the settings and operating options can be set to require a password for authorization.

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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2Operation
The operating panel of the MC3-SC is split into two parts, with the compressor part (SUCTION) on
the left and the condenser part (DISCHARGE) on the right. These two parts are operated and read in
virtually the same way. The current status and settings of the controller can be read off from the
touch panel.
2.1 General
This manual gives an abridged overview of the options for operating the NC3-SC controller. This
document describes how to operate the controller via the touch screen. The various possibilities
are explained using screen shots. The screen shorts were made with the controller language set to
English.
2.2 Standby mode
When the power to the controller is switched on, it will start up and display the following screen.
This screen shows that the controller is in standby mode. Various actions can be taken from here:
-Reinitialize the communication between the controller and the touchscreen.
This is possible if the touchscreen has been switched on before the controller. In such
cases, it is possible that the touchscreen cannot see whether the controller has come out
of standby mode. This action is taken by pressing the VDH logo.
-Switching the controller off
Pressing the “Power off” button switches of the controller completely. This should be done
before disconnecting it from the mains, e.g. for maintenance. It is possible to disconnect
the controller without using this button first, but this can have a negative effect in the
longer term on the lifespan of the SD card in the controller. Confirmation is requested
before the controller is actually switched off.

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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-Turning the controller on
The controller can be turned on using the power button at the bottom right of the screen. If
the controller settings require a password for modifications, this will first be checked.
-Changing the communication settings
The communication between the touch panel and the controller uses TCP/IP. This means
that both the controller and the touchscreen must have IP addresses. By default, this is
192.168.100.1 for the controller and 192.168.100.101 for the touch panel.
The touch panel has to be told where to find the controller. This can be done by touching
the text “MC3-SC” (in the middle of the screen) and holding for 10 seconds. The following
screen then appears.
Changing the blue numbers lets you tell the touch panel the controller’s IP address if it has
been changed. Underneath, for information purposes only, is the IP address of the touch
panel.
The IP address of the panel can be changed as follows:
-hold your finger on a grey part of the startup screen for 5 seconds (e.g. above the
“MC3-SC” text)
-a popup menu appears; select the “Show System Settings” option here
-press the “Back” button (at the bottom of the screen) twice
-a box showing the text “Network” in blue can now be seen
-click this and alter the network settings
-click “OK” and the cross at the top right of the screen

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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2.3 Switching the controller off
Before the controller can be switched off, the password must be entered if required. The “OK”
button then has to be held in for 10 seconds.
2.4 Turning the controller on
After the controller has been switched on and the password has been given (if required), the screen
will show a status overview of the controller.
The screen shown here gives an overview of the compressor (suction) part on the left and an
overview of the condenser (discharge) part on the right.
This screen also contains two buttons located in the top corners.
-Settings button. This button is in the top left corner (VDH logo). This is where the controller
settings can be adjusted.

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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-Standby button. This button is in the top right corner. It can be used for putting the
controller into standby mode. Confirmation will be required first, of course.
The standby button is not visible if the controller is configured to use a password for any
changes that are to be carried out and when the user is logged out (either manually or by a
timeout).
The settings button does remain visible, so that the user has the possibility of logging in.

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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2.5 Screen layout
2.5.1 Settings button
The user can use this button for changing settings, logging in or viewing alerts.
Settings button
This symbol is used to
show that the user is
logged in
Date and time
Standby button
More/less power
Compressor
overview
Condenser
overview
Control data
for regulating
the
compressors
Control
data
for
regulating
the
condensers
Active compressor
steps

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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2.5.2 Login symbol
This lets you see whether the user is logged in and able to make changes, can switch the controller to
standby or off, etc.
2.5.3 Standby button
This button can be used for switching the controller to standby and then turning it off if desired.
2.5.4 Control data for regulating the compressors
The control data is split into three layers: a pressure component, a calculated temperature
component and a measured temperature component (which requires a suction-side temperature
sensor).
The measured values are always shown in the middle, with the setpoints on the right. These
setpoints are shown in blue. If the defined setpoint is overruled by an external setpoint, the defined
setpoint is shown in a small font with the active setpoint below in a larger font (and in black).
2.5.5 Control data for regulating the condensers
Like the compressor regulation, the control data is split into 3 layers. As an exception, the lowest
layer does allow the measured discharge temperature, the measured outside temperature or both
to be displayed. This depends on the parameters and whether one or both sensors are connected.
Compression side (discharge) temperature display
Outside temperature display
Display showing both temperatures