Operating Instructions (GB)
900 191 - V1.0
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Page 24
9.
Fuse protection and optional accessories
9.1
Power unit
The power unit of the control system depends on the equipment. Please check the relevant
circuit diagram of the control system.
9.2
Fuse protection provided by customer
The power supply of the control system has to have an all-pole protection on-site via a
suitable pre-fuse that is appropriate for the current ratings of the control system. The max.
permissible values can be found on the type plate or the enclosed documents and wiring
diagrams. The tripping characteristics have to match the current conditions.
9.3
24 VAC transformer
Depending on the configuration of the control system, a transformer can be installed to
connect the appropriate solenoid valves or electrical actuators.
The maximum connected load of the corresponding transformer must
be observed. This information is provided in the accompanying circuit
documentation.
9.4
Circuit breaker, emergency off
If the control system is equipped with a circuit breaker, the control system can be switched on
or off via the circuit breaker. The circuit breaker has an emergency stop function and switches
off the entire control system in the event of danger, even under load. The circuit breaker can
be secured against unauthorised access by using a padlock in the OFF position.
Terminals in front of the switch will carry voltage, even when the circuit
breaker is turned off!
If the control system is equipped with a battery module, the control
electronics will be operational even when the main switch is switched off,
as long as the batteries are charged; the pumps and valves will not be
working.
9.5
Residual current circuit breaker (RCCB)
The control system is equipped with a residual current circuit breaker. If an insulation fault
occurs, the residual current circuit breaker trips and disconnects the pumps and valves from
the power supply. The error is shown as a fault message in the control's TFT display.
After the error has been rectified, the residual current circuit breaker must be switched on
again manually.
9.6
Overvoltage protection
We recommend installing suitable overvoltage protection, particularly for control systems
operated in the open or those connected to supply networks from overhead lines or other
environments in which overvoltage can be expected. It may also be necessary to use
overvoltage protection for the measuring lines of the level controls.
9.7
Battery module*
The control system can be operated with a battery module. If the control voltage fails, the
control system will continue to operate. Settings can be changed in the control system’s
menu.
However, the pumps and valves are not operated!
The batteries are charged via the control system and can be used via the 24 V connection and
the potential-free alarm relay to enable signalling of the alarm (indicator lamp/horn) even in
the event of a power failure.
*
Please also read the separate operating instructions for the battery module!
