2.3 System Components
2.3.1 Control Panel
The control panel is a stainless steel IP66 enclosure for mounting locally to the sensor unit and pump(s),
outside the bund. The control circuitry uses the sensor inputs to determine whether a pump should be
ON or OFF and generate any necessary alarms. This behaviour of the pump(s) and alarm can be
customised through the menu system shown on the internal LCD.
The control panel provides zero-volt free contact relays rated at 220Vdc @ 0.1A for the following
alarms:
Mains failure
High Water
High Oil
System Fault
Pump 1 disable
Pump 2 disable
The control panel also presents LED indicators to signify the following alarms:
The control circuitry incorporates a pair of independent electronic fail-safe(dead stop) circuits “pump
disable” the feature is incorporated to provide a fail-safe for the main switching contacts to the pump.
This feature will isolate the pump in the event of a system malfunction. A pump disable alarm is
indicated by the respective relay and front panel LED activating. The pump disable always momentarily
activates after an ON to OFF transition of the pump, this is normal, and should be ignored. A de-
bouncing delay of 1 second on any system monitoring this output is recommended.
In addition to the LED indicators listed above the unit also has an LCD screen which gives further alarm
details and system information. When no alarms are active the number of pump operation is displayed.
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