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3.2
Motor protection
Depending on the layout of the control, each pump features a thermal overload relay or
a manual motor starter. Setting of the current values is carried out directly on the thermal overload
relay or on the manual motor starter and shall be in accordance with the pump data. The setting must
be carried independently of the rated current settings of the electronic motor protection of the control
unit. When the motor protection trips due to an overload, the fault is indicated in the display. After
eliminating the problem, the manual motor starter or overload relay must be reset manually.
3.3
RCD's (ELCB)
The control unit may be equipped with one or two RCD's. When the RCD's trip, the pumps are
switched off. Should the RCD's trip due to a fault current, it is displayed in the control. After eliminating
the problem, the RCD(s) must be reset manually.
4
Function
4.1 Level measurement method
The control may be used for different level measurement methods:
1. External level sensor
•
measuring range from 0 ... 1m WC up to 0 ... 10m WC (adjustable);
•
4... 20mA interface
•
additionally a float switch PSN as high water level monitor
2. Internal impact pressure measuring sensor
•
measuring range 0 ... 2 m WC
•
for connection to a wet bell using a pneumatic tube
•
additionally a float switch PSN as high water level monitor
3. Up to 4 float switches PSN
4.2
Pump control
The control can operate optionally with one or two pumps
the function: When an adjustable level is exceeded or the respective float switch switches, then the
pump is switched on. When a level sinks under an adjustable value, then the pump is switched off
after the set run-on time period (delay on break) elapses. When the control recognises a high water
situation, then the pump remains switched on as long as this state is maintained. Simultaneously a
fault message is given.
4.2.1
Off – Automatic – On mode
Apart from the above described automatic operation mode, each pump may be manually switched off
or on by means of the operating keys or an external toggle switch. For details see Chapter 5.3
2
Depending on the features, the operation with only one pump is possible as well.
2
. Generally, the following can be said about
HOMA Pump Technology
HSK_operating_manual_English_Ver3.doc
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