Figure 8 . Typical nameplate, domestic 60 Hz design .
Placing regulator into service
DANGER
Explosion Hazard . During bypass switching, the
regulator must be in the neutral position . Prior to
bypass switchinge: 1) The regulator must be placed in
the neutral position; 2) Tap-changer operation must be
disabled during the bypass switching . If the regulator is
in any other position, part of the series winding will be
shorted when the bypass switch is closed, resulting in
high circulating current . Failure to comply will result in
death or severe personal injury and equipment damage .
WARNING
Hazardous Voltage . To protect personnel from surges
while operating the control, follow these control
enclosure grounding procedurese: a) If the enclosure is
attached to the regulator tank or is remote from the
tank but only accessible with a ladder, connect the
enclosure to the regulator-to-ground rod conductor; b)
If the enclosure is accessible by personnel standing on
the ground, connect the enclosure directly to a ground
mat and ground rod . Failure to comply can result in
severe personal injury or death .
CAUTION
Equipment Damage . Only an AC power supply is to be
used to energize the control externally . Do not use a
DC-to-AC voltage inverter . Failure to comply can cause
excessive harmonics to be generated and result in
damage to the front panel .
CAUTION
Equipment Damage . When connecting external power
to the voltage regulator control, make sure the polarity
of the power source is correct . Reverse polarity will
result in control damage .
Refer to Service Information MN225003EN,
CL-7
Voltage Control Installation, Operation, and Maintenance
Instructions
, for information on the CL-7 voltage regulator
control, including placing the control into service and initial
programming.
As with all electrical equipment,
proper grounding of a
voltage regulator control box is essential
. The voltage
regulator control box must be grounded to the tank ground
pad or earth ground. A poor ground connection to the
control box can result in a hazard to operators and control
malfunctions. Attaching a control box to the regulator tank
does not ensure a proper ground because of the painted
surfaces of the tank and control box. A ground pad tapped
for 1/2"-13 UNC thread is provided on the side of the control
cabinet to be used for grounding.
After programming the control for basic operations,
perform a control operational check of manual and
automatic operations before completing the installation
of the regulator. Regulators can be placed into service
without interrupting load continuity by installing bypass and
disconnect switches.
To perform an operational check and the switching
operations to install a regulator onto a system, use one of
the following procedures:
●
●
Use
when employing one bypass switch
and two disconnect switches.
●
●
Use
when employing a single-pull regulator
bypass-disconnect switch.
When energizing the control from an external source, use
only a 120 Vac source, unless the control is set up for
240 Vac, indicated by a decal adjacent to the terminals and
the presence of a step-down auto transformer in the control
box.
Figure 10 . Typical CL-7 single-phase control back-panel
Figure 11 . Typical CL-7 control multi-phase back-panel
8
VR-32 and EVER-Tap™ Voltage Regulator
InstallatIon, operatIon, and MaIntenance InstructIons
MN225008EN June 2020
