MODVAR Low voltage reactive power |
ABB Instruction manual 10
5.0 Commissioning
With the equipment isolated from the supply, check:
− Cabling is properly connected (including earth)
− Ambient ventilation is adequate
− Correct tightness of the connections
6.0 Operation
The MODVAR module capacitor unit is delivered with factory-
installed discharge resistors to comply with IEC 60831 and
allow a decrease of the residual voltage to less than 50V after
1 min. disconnection from supply.
During operation, make sure the delay before the MODVAR
is re-energised is not shorter than 40 sec. Failure to follow
this rule may cause damage to and reduce the lifetime of the
capacitor.
Harmonics
Installation of capacitors on networks disturbed by harmonics
may require special precautions especially when there is a risk
of resonance phenomena. Please ensure that your installation
is as per the over current rating according IEC 60831
standards. Contact ABB for technical support.
7.0 Maintenance
Ensure safety procedures are completed (see paragraph
“1.0 Safety”). Maintenance frequency depends on working
conditions. As minimum annual maintenance should include:
− Removal of dust deposits, cleaning of all parts.
− Check of tightness of all electrical connections.
− Check of ambient temperature.
− Check condition of discharge resistors.
− Check for capacitance of CLMD capacitors.
MODVAR module discharge devices are not suitable
for use with rapid switching. (Minimum off time: 40
sec)
