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

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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.

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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.

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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

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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.

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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.

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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

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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

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2.5.6 Active compressor steps
At the bottom of the compressor display, the active levels for are shown for the compressors that
are enabled. Compressors that are turned off or not configured will not have a value shown beneath
the symbol.
2.5.7 Compressor status overview
A status overview is given for each of the compressors. The symbols may be shown in various
colours.
-Grey means that the compressor is turned off.
-Green means that the compressor is switched on.
-A blinking green field around it means that the compressor is being switched on or off, of
that a level is being enabled or disabled. This can be seen from the green triangles in the
blue bar (more/less power).
-Yellow means the compressor has been put into service.
-Blinking yellow means that the compressor’s operating switch has been used to switch it
off.
-Red means a compressor fault.
2.5.8 More/less power
If more or less power is required, this is shown using a symbol. In addition to displaying a symbol
(arrow up or down), the compressor or condenser for which the control signal is about to change
will blink green.
2.5.9 Condenser status overview
Like the compressor status overview, this part contains symbols that represent the status of the
compressors.

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2.6 Compressor service
Pressing the compressor overview shows a dialogue that can be used for bringing the compressors
into service or removing them from the ‘in service’ status.
The service status of a compressor can be changed by pressing it. The compressor symbols at
the bottom will then go yellow.
At the bottom of this screen is a symbols with a clock. Pressing this button gives a dialogue
that can be used for resetting the runtime hours counters for the compressors.
Pressing the “Reset” button after a compressor lets you zero the runtime counter for that
compressor.
Putting a condenser into service or zeroing its operational hours counter can be done in the
same way as for the compressors; however, you have to start from the overview screen for the
condensers.

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2.7 Troubleshooting
If a compressor is in an error status, this is shown on the main screen.
The compressor overview shows you which compressor has the error, and the control data is
shown on a red background. An exclamation mark will also be blinking at the top of the screen.
When an alert (not an error) is being signalled by the controller, the touchscreen will show this
by putting a yellow background behind the control data.

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Pressing the red field will give an overview of the alerts that have currently not been
acknowledged.
If there are active alerts, they are shown in the screen and can be acknowledged using the
button at the bottom right.
The button at the top left with the VDH logo can be used for going back to the overview screen.

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2.8 Controller settings
The Settings button takes you to the following screen.
Pressing the button with the key displays the login/logout screen.
The password for logging in can then be entered in the rectangular field in the middle. The button at
the bottom right can be used for logging out and the one at the bottom centre lets you change the
password.
The button with the clock lets you change the clock for the controller and the touchscreen.
The time on the MC3-SC controller is shown on the left-hand side; this can be changed and the
Apply button then saves it to the controller. On the right-hand side there are two buttons for
setting the time in the controller to match the panel (after which you have to press Apply) or for
using the time filled in for the controller as the panel time.

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The button with the book symbol is used for changing the controller’s parameters/
This screen lets you set the language to be used and various parameter settings can also be
adjusted. The up and down buttons can be used for selecting the desired parameter. The desired
parameter numbers can also be filled in directly by pressing the field with the number. The value for
the parameter is shown to the right of the parameter number. The minimum and maximum
permissible values are shown beneath it.
A description of the parameter is given below.
The button with the exclamation mark can be used for showing the list of current alerts.
There is a button beneath the list for acknowledging the active alerts. The alerts disappear from the
list once they have been acknowledged and eliminated.

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2.9 Thermostat function
When there is a triangle in the discharge part of the touchscreen, it means that the controller also
has a thermostat function.
Pressing this replaces the discharge part of the screen with a thermostat readout.
The thermostat can work fully autonomously or it can also be used for lowering the setpoint of the
suction section.
Thermostat
setpoint
Cooling active;
evaporator
valve open
Evaporator
fan running
Flow detected
Modified setpoints when the
thermostat is active. Original
setpoints are in blue.
External
on/off

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3Parameters
Number Description Range Unit Value
Compressor settings
P
10
Minimum adjustable compressor pressure
setpoint
-
1.0 to 50.0
bar
1.0
P
11
Maximum adjustable compressor pressure
setpoint
0.0 to 50.0
bar
50.0
P
12
P
band for compressor level control
0.1 to 50.0
bar
8.0
P
13
Switch
-
on delay for the next compressor
1 to 600
sec
30
P
14
Switch
-
on delay for the next compressor
step
1 to 600
sec
0
P
15
Step
-
up time between the compressor steps
1 to 600
sec
300
P
16
Step
-
down time between the compressor
steps
1 to 600
sec
30
P
17
Compressor regulation type
2 = capacity regulation for non-identical
capacities
2 to 2
-
2
P
18
Compressor strategy
0 = no restrictions
1 = leave the operational compressor
running
2 = only step up compressors
0 to 2
-
0
P
19
Minimum capacity gain per step
0.1 to 300.0
kW
1.0
P
20
Minimum time between switching the same
compressor off and on again
0 to 999
sec
120
P
21
Unloaded running time when starting a
compressor (valves are lifted)
0
to 30
sec
3
P
22
Minimum compressor running time
0 to 999
sec
30
P
23
Pressure at which the next step comes
online without delay
-
1.0 to 50.0
bar
10.0
P
24
Pressure below which the minimum running
time is skipped
-
1.0 to 50.0
bar
0.0
P
25
P
band for the compressor frequency
controller and Bitzer CSH slider valve
0.1 to 50.0
bar
10.0
P
26
I
time for the compressor frequency
controller
0 to 999
sec
0
P
27
Maximum number of starts per hour
0 to 20
0 = unlimited
-
6
P
28
Increase capacity
interval time
1 to 999
-
5
P
29
Decrease capacity interval time
1 to 999
-
5

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Number Description Range Unit Value
Condenser settings
P
30
Minimum adjustable condenser pressure
setpoint
0.0 to 50.0
bar
1.0
P
31
Maximum adjustable condenser pressure
setpoint
0.0 to 50.0
bar
50.0
P
32
P
band for condenser regulation
0.1 to 50.0
bar
8.0
P
33
Minimum condenser frequency controller
output signal
0 to 100
%
11
P
34
Amplification factor for the condenser
frequency controller
1 to 100
%
100
P
35
Step
-
up time between the condensers
1 to 600
sec
300
P
36
Step
-
down time between the condensers
1 to 600
sec
30
P
37
Condenser control type
1 = Step up/down in fixed sequence
(1, 2 ,3, 4 then 4, 3, 2, 1)
1 to 1
-
1
Temperature sensors
P
40
Suction
-
side temperature sensor
(sensor 1)
0 = absent
1 = present, read-only
2 = present, read-out and alerts
0 to 2
-
0
P
41
Compression
-
side temperature sensor
(sensor 2)
0 = absent
1 = present, read-only
2 = present, read-out and alerts
0 to 2
-
0
P
42
Minimum suction side temperature sensor
alert
-
40.0
to 50.0
°C
-
40.0
P
43
Minimum suction side temperature sensor
fault
-
40.0 to 50.0
°C
-
40.0
P
44
Maximum compression side temperature
sensor alert
-
40.0 to 100.0
°C
100.0
P
45
Maximum compression side temperature
sensor fault
-
40.0 to 100.0
°C
100.0
P
46
Suction side temperature sensor offset
-
10.0 to 10.0
K
0.0
P
47
Compression side temperature sensor offset
-
10.0 to 10.0
K
0.0
P
48
Outside sensor
0 = absent
1 = present for delta-T control
0 to 1
-
0
P
49
Outside temperature sensor offset
-
10.0 to
10.0
-
0.0
Compressors in general
P
50
Discharge pump pressure value
-
0.1 to 50.0
bar
1.0
P
51
Discharge pump active
0 = no, 1 = yes
-
0
P
52
Level input giving fatal alarm
0 = no, 1 = yes
-
0
P
53
Release pressure for economizer
-
0.1 to 50.0
bar
2.3
P
54
Economizer differential
0.1 to 0.5
bar
0.3

MC3-SC Stepped Controller Document no.: 140744 version 1.3
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Number Description Range Unit Value
Condensor pressure at low temperatures
P 60
Temperature under which condenser
limitation becomes active
-
40.0..50.0
°C
-
40.0
P 61
Maximum allowable pressure increase
0.0..50.0
Bar
3.0
P 62
Minimum
duration of maximum pressure
increase
0..6000
sec
10
Pressure sensors
P
70
Suction pressure for 4.0
mA
-
1.0 to 50.0
bar
0.0
P
71
Suction pressure for 20.0
mA
-
1.0 to 50.0
bar
25.0
P
72
Suction pressure sensor offset
-
10.0 to 10.0
bar
0.0
P
73
Pressure
sensor readout in 0.01
bar
0 = no, 1 = yes
-
0
P
80
Discharge pressure for 4.0
mA
-
1.0 to 50.0
bar
0.0
P
81
Discharge pressure for 20.0
mA
-
1.0 to 50.0
bar
25.0
P
82
Discharge pressure sensor offset
-
10.0 to 10.0
bar
0.0
Coolant
P
90
Coolant type
0 = Unknown
1 = R22
2 = R134A
3 = R290
4 = R404A
5 = R407A
6 = R407C
7 = R407F
8 = R410A
9 = R422D
10 = R507
11 = R717
12 = R744
13 = R1234ZE
14 = self-defined
0 to 14
-
0
P
91
Superheat detection enabled
0 = no, 1 = yes
-
0
P
92
Superheat warning
0.0 to
50.0
K
8.0
P
93
Superheat fault
0.0 to 50.0
K
7.0
Temperature
-
dependent condenser regulation
P
95
Outside temperature based regulation
enabled
0 = no, 1 = yes
-
0
P
96
Delta T condenser with external temperature
1.0 to 15.0
K
10.0
P
97
Maximum condenser pressure setpoint
0.0 to 50.0
bar
50.0
Pressure monitoring
P
100
Minimum pressure alert, suction side
-
1.0 to 50.0
bar
0.5
P
101
Minimum pressure alert delay, suction side
0 to 999
sec
10
P
102
Minimum pressure fault, suction side
(this is
not delayed and the compressors are
blocked)
-
1.0 to 50.0
bar
0.0
P
105
Maximum pressure alert, discharge side
-
1.0 to 50.0
bar
18.0