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Chapter 7 - Preventive maintenance (PM)
VarSet User Manual
Replacement of components
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E or CSA Z462.
• This equipment must be installed and serviced only by qualified electrical
personnel.
• Turn off all power supplying this equipment before working on or inside
equipment.
• After removing power, wait for 5 minutes to allow the capacitors to discharge
prior to opening the doors or removing covers.
• Always use a properly rated voltage sensing device to confirm power is off.
• Replace all devices, doors, and covers before turning on power to this
equipment.
• Carefully inspect the interior for tools left behind before closing and sealing the
door.
Failure to follow these instructions will result in death or serious injury.
During maintenance, if any capacitor step is found to be losing capacitance, the
capacitor must be replaced. During normal operation conditions, the following
components must also be replaced at these intervals:
Years of continuous use (Ambient Years of continuous use (Ambient
35°C [95°F] or not measured)
25°C [77°F])
Capacitor
7
10
Contactor
7
10
To replace the capacitor:
1. Open the disconnect to de-energize the capacitor bank. Ensure that the external
upstream main breaker feeding the capacitor bank is open. Make sure the lock-out,
tag-out procedure is followed and wait five minutes before opening the door to the
capacitor bank.
2. Open the front door of the capacitor bank and test for line voltage, L-L, L-Ground at
the bottom of F1, F2, and F3 (control fuses). There should be no voltage (0 V).
3. Manually trip all stage breakers
4. Remove wires from all three phases of the capacitor.
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