13
Integrated voltage sensing option
INSTALLATION AND OPERATION INSTRUCTIONS
MN280103EN March 2023 www.eaton.com
Verify correct ground of the NOVA NX-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 housing.
Provide a good electrical ground connection to the control
cabinet ground.
ote:
N
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 voltage sensing options
(source and/or load-side voltage sensors).
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.
The recloser utilizes a 37-pin control cable to carry the
source and integrated load-side voltage-sensing signals
from the recloser to the control. Additional voltage-sensing
cables are not required when using the voltage-sensing
feature for source and load. There are no additional custom
connections required.
NOTICE
EQUIPMENT MISOPERATION. VERIFY ALL CONNECTOR PINS
AND BOTH MATING INTERFACE SURFACES ARE CLEAN AND
DRY BEFORE CONNECTING CABLES. VOLTAGE-SENSING ERRORS
CAN RESULT FROM CONTAMINATION. FAILURE TO COMPLY CAN
RESULT IN CONTROL AND RECLOSER MISOPERATION.
The electrical connectors of the recloser, control, and cable
must be clean and dry. Contaminated surfaces may be
cleaned with denatured alcohol and wet connector surfaces
may be dried with a heat gun. Dry surfaces are particularly
important for the integrated voltage sensor connections.
The accuracy of the sensors can be influenced by moisture
contamination.
Connect control and power cables to the control. Verify that
the proper cable/receptacle connections are made. Improper
cable connections can result in damage to the recloser
and/or control.
Complete the control programming before making the
high-voltage line connections. See the Recloser Operation
section on page 10.
When the NOVA NX-STS recloser is equipped with three
or six integrated voltage sensors, then the Form 7 control
must have LEA selected in the drop-down menu for each
source/load bushing in the System Configuration screen.
The Form 7 control will automatically apply the correct
PT ratio and phase angle adjustment automatically based
upon control cable length entered. Refer to
for reference.
If potential transformers (PTs) are used for voltage sensing,
then select either wye or delta connection type in the
System Configuration screen with appropriate PT ratio and
phase angle adjustment values entered. Refer to
Service
Information MN280095EN Form 7 Microprocessor Based
Pole Mount Recloser Control Installation and Operation
Instructions
for more information on installing the
Form 7 control.
