Maintenance
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Maintenance
Maintenance Overview
Preventive maintenance is primarily a matter of
routine inspection and cleaning. The most
important maintenance factors are the
following:
Is their sufficient airflow to cool the drive?
Has vibration loosened any connections?
The HPV 900 Series 2 needs to have sufficient
air flow for long, reliable operation.
Accumulated dust and dirt accumulation can
reduce airflow and cause the heat sinks to
overheat. The heat sinks can be kept clean by
brushing, while using a vacuum cleaner.
Periodically, check air filters on enclosure
doors, clean if dirty and replace as necessary.
Periodically, clean the cooling fans to prevent
dirt buildup. At the same time, check that the
impellers are free and not binding in the
housing.
Periodically, check all mounting and electrical
connections. Any loose hardware should be
tightened.
WARNING
Hazardous voltages may exist in the drive
circuits even with drive circuit breaker in off
position. NEVER attempt preventive
maintenance unless incoming power and
control power is disconnected and locked out.
Also, ensure the DC Bus charge light is out.
Drive Servicing
Remember when servicing the HPV 900
Series 2: Hazardous voltages may exist in the
drive circuits even with drive circuit breaker in
off position.
IMPORTANT
Use extreme caution: Do not touch any circuit
board, the drive, or motor electrical
connections without making sure that the unit
is properly grounded and that no high voltage
is present.
NEVER attempt maintenance unless:
the incoming three phase power and control
power is disconnected and locked out.
also, ensure the DC Bus charge light is out.
even with the light out, we recommend that
you use a voltmeter between (+3) and (-) to
verify that no voltage is present.
If after 5 minutes the DC bus charge light
remains ON or voltage remains between
terminals (B1) and (-):
First, check that the incoming three phase
power is disconnected
Once the incoming three-phase power is
disconnected, it will be necessary to
discharge the DC bus with a “bleeder”
resistor.
IMPORTANT
Use extreme caution when connecting the
bleeding resistor.
Using a
250ohm/100 watt “bleeder” resistor,
connect the resistor leads to the (B1) and (-)
terminals located on the brake resistor
terminal.
The resistor leads should be connected for 20
seconds or until the DC bus charge light
extinguishes.
Once the DC bus charge light is out, verify with
a voltmeter that no voltage exists between the
(B1) and (-) terminals.
It will be necessary to have the drive repaired
or replaced.
Reforming Bus Capacitors
The following is a procedure for reforming the
electrolytic bus capacitors.
If the drive has been stored for more than 9-
months, it is recommended that the bus
capacitors be reformed. After 18 months of
storage it is
mandatory
that the bus capacitors
are reformed.
The bus capacitors in the HPV 900 Series 2
can be reformed
without removing them from
the drive.
To reform the capacitors, voltage
must be gradually increased as follows:
Increase the AC input voltage from zero at a
very slow rate, approximately 7 VAC per
minute, reaching full rated voltage after about
an hour.
This will reform the capacitors.
Lifetime Maintenance
The HPV 900 Series 2 is an AC digital drive. It
is intended to last for twenty years in the field
assuming the drive is installed and run
according to Magnetek specifications and
recommendations. The following
recommendations for part replacement to
ensure twenty-year life is as follows:
Fans - 3 to 8 years
depending on ambient temperature and dust
Bus Capacitors - 8 to 15 years
depending on ambient temperature and
elevator system load profile
