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6 Electrical installation and wiring
All installations and maintenance have to be performed by properly trained
and qualified personal with proper tools!!
In case of a failure, disconnect or switch off electrical power and wait
5 minutes for capacitor discharge before servicing the HYDROVAR.
Otherwise it can cause shock, burns or death.
6.1 Means of protection
Ask your power supply company which means of protection are required.
Applicable:
• protective earthing
• AC and DC residual current operated protective devices (RCD)
• TN systems
Protective earthing:
• Please note that there can be a current to earth due to the capacitors in the input filter.
• A suitable protection unit has to be selected (according local regulations).
Residual current device (RCD):
• When using an RCD, make sure that it also releases in the event of a short circuit inside the
DC-part of the HYDROVAR to earth!
o single phase HYDROVAR => use pulse sensitive RCDs
o three phase HYDROVAR => use AC/DC sensitive RCDs
• The RCD has to be installed according local regulations!
Automatic circuit breaker:
• Use automatic circuit breaker with C-type characteristic curve
• Rating of the line-protection (see chapter 3. Technical Data)
Internal protective devices of the HYDROVAR:
• The malfunctions short circuit, under- and over-voltage and the overheating of the
electronic components (overload) are controlled by the HYDROVAR.
External protective devices:
• Additional protective functions like motor overheat and low water protection, are
controlled by external equipment.
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