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NOVA™ STS Single-Tank, Triple-Single, Electronically Controlled Recloser
INSTALLATION AND OPERATION INSTRUCTIONS
MN280046EN May 2016
Service information
Service requirements
The NOVA STS recloser requires minimum routine
inspection to check for physical damage and verify proper
operation.
It should not be necessary to access the mechanism of the
NOVA STS recloser. If entry is required, the trip and close
capacitor must be discharged prior to any contact with the
mechanism. The capacitor retains an electrical charge, even
with the control cable disconnected.
Discharge trip and close capacitor
WARNING
Personal injury . The trip and close capacitor retains
an electrical charge . Always discharge the trip and
close capacitor prior to performing any service on the
mechanism . Contact with a charged capacitor can result
in skin burn or electrical shock .
T
3
89 .0
To discharge the trip and close capacitor:
1. Remove the recloser from service. Refer to the
Remove recloser from service
section of this manual.
Follow standard utility procedures regarding removal of
the recloser from service. Refer to the section in this
manual on moving and lifting the NOVA STS recloser.
WARNING
Falling equipment . Use the lifting lugs provided and
follow all locally approved safety practices when lifting
and mounting the equipment . Lift the unit smoothly
and do not allow the unit to shift . Improper lifting
can result in severe personal injury, death, and/or
equipment damage .
G106 .3
2. Loosen bolts that secure the tank and remove the tank
bottom from the tank top.
CAUTION
Equipment damage . Always unplug the control cable
from the control prior to discharging the capacitor .
Failure to do so can result in resistor damage .
T267 .0
3. Locate the white discharge button on each actuator
circuit board. See Figure 15.
Discharge button
LED
Figure 15 . Location of white discharge button and LED
discharge indicator on actuator circuit board .
4. Push and hold in the discharge button. The discharge
LED will light up and gradually dim as capacitor energy
is discharged. This will take approximately 45 to 60
seconds.
5. When the light completely dims, release the button.
6. The capacitor is now discharged.
otee:
N
This procedure must be completed on all three actua-
tor boards prior to conducting maintenance.
otee:
N
After approximately twenty minutes, the discharged
capacitor may have recharged up to 7 volts. If
this occurs, the Discharge LED will light up if the
Discharge button is pushed.
7. Reassemble the tank. Tighten the twelve bolts that
secure the tank to approximately 7 Nm (5 ft•lbs).
Frequency of inspection
Because these reclosers are applied under widely varying
operating and climatic conditions, service intervals are
best determined by the user based on actual operating
experience. However, solid-insulated, vacuum-interrupting
reclosers should be inspected every ten years.
