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4.1 Single-phase versions
The single-phase versions are controlled by the CS 201
controller.
The CS 201 offers the following functions:
•
Automatic cascade control of pumps by means of two
pressure switches.
•
Automatic pump changeover at any start/stop cycle.
•
Pump and system monitoring functions:
– Short-circuit protection by means of fuses.
– Motor overload protection by means of a thermal switch built
into the motor.
– Dry-running protection by means of an additional pressure
switch or level switch (accessory). See section
.
Figure 1 shows the control panel of the CS 201 controller.
Fig. 1
Key to the symbols in fig. 1:
4.2 Three-phase versions
The three-phase versions are controlled by the CS 203b
controller.
The CS 203b offers the following functions:
•
Automatic cascade control of pumps by means of two
pressure switches.
•
Automatic pump changeover at any start/stop cycle.
•
Start and stop delays to prevent simultaneous starting/
stopping of the two pumps.
•
Stop delay after reaching the respective cut-out pressure.
•
Output for external alarm device (the alarm device is an
accessory).
•
Emergency operation in case of damaged electronics
(the emergency kit is an accessory).
•
Pump and system monitoring functions:
– Short-circuit and overload protection by means of an
automatic circuit breaker.
– Dry-running protection by means of an additional pressure
switch or level switch (accessory). See section
– Overpressure protection by means of an additional pressure
switch (accessory). See section
.
Figure 2 shows the control panel of the CS 203b controller.
Fig. 2
Key to the symbols in fig. 2:
CS 201 control panel
T
M
01 7
877 49
99
Pos.
Description
1
Main switch.
2
Selector switch for each pump:
Manual operation/off/automatic operation.
3
Green indicator light, indicating that the power supply
has been switched on.
4
One green indicator light for each pump, indicating
pump operation.
5
Red indicator light, indicating dry-running alarm.
4
2
1
5
3
CS 203b control panel
T
M
01
7879
4999
Pos.
Description
1
Main switch.
2
Selector switch for each pump:
Off/automatic operation.
3
Push-button for each pump:
Manual operation or alarm resetting.
4
One red indicator light for each pump, indicating pump
fault.
5
One green indicator light for each pump, indicating
pump operation.
6
Green indicator light, indicating that the power supply
has been switched on.
7
Red indicator light, indicating dry-running alarm (light is
on)
or
overpressure alarm (light is on)
or
alarm for
failing pressure switch at start/stop (light is flashing).
8
Orange indicator lights:
"3" is off in case of overpressure alarm.
"1" and "2" are on or off according to the respective
pressure switches for starting and stopping of the
pumps.
"0" is off in case of dry-running alarm.
3
2
1
0
P1
P2
1
0
1
2
3
5
6
7
8
4
3
2
1
0
P1
P2
1
0
