10
NOVA™ STS Single-Tank, Triple-Single, Electronically Controlled Recloser
INSTALLATION AND OPERATION INSTRUCTIONS
MN280046EN May 2016
Actuator circuit board
The actuator circuit board, located within the mechanism,
drives the mechanism based upon signals sent from the
control. The actuator board manages the high power path by
providing precharge and discharge capabilities and provides
the proper current pulses and timing to the mechanism.
It also prevents closing when there is insufficient energy
stored in the trip and close capacitor.
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 .
T266 .0
A trip and close capacitor, located within the mechanism,
stores the necessary energy for operating the recloser.
The Discharge Trip and Close Capacitor procedure is located
in the
Service information
section.
Internal voltage sensing option
WARNING
This equipment is not intended to protect human
life . Follow all locally approved procedures and safety
practices when installing or operating this equipment .
Failure to comply can result in death, severe personal
injury, and equipment damage .
G102 .1
WARNING
H
azardous voltage . Always use a hotstick when working
with this equipment . Failure to do so could result in
contact with high voltage, which will cause death or
severe personal injury .
G108 .1
WARNING
Hazardous voltage . Solidly ground all equipment . Failure
to comply can result in death, severe personal injury,
and equipment damage .
T223 .2
IMPORTANT
Disconnect switches for AC control power are necessary to
isolate the control for testing and servicing.
WARNING
Hazardous voltage . If terminal connections are reversed,
the internal voltage sensing option may indicate zero
voltage with the contacts open . Do not rely on internal
voltage sensing to ensure that the voltage is zero and
the line has been de-energized . Always follow proper
safety practices and use a separate detection method
to verify a de-energized condition . Failure to do so can
result in contact with high voltage, which will cause
death or severe personal injury .
T365 .0
The NOVA STS recloser is available with internal voltage
sensing when specified at time of order with the Form 6
Triple-Single control. Refer to the
Installation procedure
section of this manual for information on the NOVA STS
recloser installation procedure. Refer to
Service Information
S280-70-7 Form 6 Triple-Single, Microprocessor-Based
Pole Mount Recloser Control Installation and Operation
Instructions
for further information on installing the Form 6
Triple-Single pole-mount control.
Verify the correct load-side and source-side terminal
connections. This is required for correct operation of the
internal voltage sensors.
Verify correct ground of the NOVA STS recloser and control
prior to making any high-voltage connections and before
high-potential testing. A proper ground connection consists
of a good electrical ground connection to the surge ground
connector located on the mechanism housings. Provide a
good electrical ground connection to the control cabinet
ground.
otee:
N
Painted surfaces of the mechanism housing may
prevent a ground connection to the recloser housing.
Always provide a good electrical connection to the
mechanism surge ground connector.
Poor grounding of the mechanism housing may result
in the presence of high voltage on the mechanism
housing associated with the high-voltage resistor
connections used with internal voltage sensing.
CAUTION
Hazardous voltage . Do not touch the receptacle
connections of the control/voltage-sensing cable . If the
recloser is energized and the control/voltage-sensing
cable is disconnected from the recloser or the control,
a voltage clamped at 250 Vac will be present at the
receptacle . Contact with this voltage can result in
personal injury .
T346 .1
The recloser utilizes a 26-pin control cable to carry the
internal voltage sensing signal from the recloser to the
control. There are no additional external connections
required.
