Single-Phase Versions; Three-Phase Versions - Grundfos Hydro Dome CHV 2-50 Installation And Operating Instructions Manual

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 5.4.
Figure 1 shows the control panel of the CS 201 controller.
CS 201 control panel
5
3
Fig. 1
Key to the symbols in fig. 1:
Pos. Description
1 Main switch.
Selector switch for each pump:
2
Manual operation/off/automatic operation.
Green indicator light, indicating that the power supply
3
has been switched on.
One green indicator light for each pump, indicating
4
pump operation.
5 Red indicator light, indicating dry-running alarm.

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 5.4.
– Overpressure protection by means of an additional pressure
switch (accessory). See section 5.5.
Figure 2 shows the control panel of the CS 203b controller.
6
7
8
4
2
1
Fig. 2
Key to the symbols in fig. 2:
Pos. Description
1 Main switch.
Selector switch for each pump:
2
Off/automatic operation.
Push-button for each pump:
3
Manual operation or alarm resetting.
One red indicator light for each pump, indicating pump
4
fault.
One green indicator light for each pump, indicating
5
pump operation.
Green indicator light, indicating that the power supply
6
has been switched on.
Red indicator light, indicating dry-running alarm (light is
7 on) or overpressure alarm (light is on) or alarm for
failing pressure switch at start/stop (light is flashing).
Orange indicator lights:
"3" is off in case of overpressure alarm.
"1" and "2" are on or off according to the respective
8
pressure switches for starting and stopping of the
pumps.
"0" is off in case of dry-running alarm.
CS 203b control panel
3
2 P1 P2
1
1
0
0
3
2 P1 P2
1
1
0
0
1
5
4
3
2
7