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9 Electrical installation and wiring
All installations and maintenance has to be performed by properly
trained and qualified personnel with proper tools!!
Use personal protection equipment.
In case of a failure, the electrical power has to be disconnected or
switched off. Wait at least 5 minutes for capacitor discharge before
servicing the HYDROVAR.
Otherwise it can cause shock, burns or death.
9.1 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 a current to earth can occur due to the capacitors in the input filter.
• A suitable protection unit has to be selected (according local regulations).
Residual current device (RCD/RCCB):
• 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 Technical Data)
Internal protective devices of the HYDROVAR:
• The malfunctions short circuit, under- and overvoltage, overload and the
overheating of the electronic components are monitored internally 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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