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Electrical Installation and Wiring
Section 8
Note
All installations and maintenance must be performed by properly trained and
qualified personnel. Use personal protection equipment.
Note
In case of a failure, the electrical power must be disconnected or switched off. Wait
at least 5 minutes for capacitor discharge before servicing the HYDROVAR. Shock,
burns or death are possible hazards if the capacitor discharges during maintenance,
repair, or assembly.
8.1 Equipment Protection
Follow state, and local codes for proper equipment protection.
Applicable: • proper grounding
• AC and DC Ground Fault Circuit Interrupter (GFCI)
Proper grounding:
• Please note that leakage to ground can occur due to the capacitors in the input lter.
• A suitable protection unit has to be selected (according local regulations).
Ground Fault Circuit Interrupter (GFCI):
• When using a GFCI, make sure that it also releases in the event of a short circuit inside the DC-part of
the HYDROVAR to ground!
• single phase HYDROVAR => use pulse sensitive GFCI's
• three phase HYDROVAR => use AC/DC sensitive GFCI's
• The GFCI should be installed according to local regulations!
Fuses:
• Use Very fast acting Class T fuses
• Bussman T-tron type JJN and JJS fuses are acceptable (or equal)
Internal equipment protection:
• The Hydrovar has internal protections against the following malfunctions: short circuit; under and over-
voltage, overload and the overheating of the electronic components.
External protective devices:
• Additional protective functions like motor overheat and low water protection are controlled by separate
equipment.
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