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Figure 12 . Typical CL-7 control back-panel for an EVER-
Tap voltage regulator
Procedure A: One bypass switch and two disconnect switches
1.
Verify from regulator nameplate that control circuit is
connected for proper regulated system voltage.
2.
Set POWER switch to OFF and CONTROL FUNCTION
switch to OFF.
3.
Knife switches on back panel should be set with V1
(potential switch) (and V2, V6, and V8 if present)
closed (pushed in) and C (CT shorting switch) open
(pulled out).
4.
Close source-load (SL) disconnect switch if available.
5.
Close source (S) disconnect switch.
6.
Set POWER switch to INTERNAL and CONTROL
FUNCTION switch to LOCAL MANUAL.
7 .
Lift raise-lower switch to operate tap-changer two or
three steps, then depress raise-lower switch to return
tap-changer to the neutral position; these steps verify
that the mechanism is functional. When on neutral,
the neutral light will glow continuously and position
indicator will point to zero or N for Neutral.
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 .
8.
Confirm the voltage regulator has been placed in
neutral before proceeding by observing these four
indicators:
a.
Neutral light is illuminated continuously and
brightly.
DANGER
InstallatIon, operatIon, and MaIntenance InstructIons MN225008EN June 2020
VR-32 and EVER-Tap™ Voltage Regulator
b.
Tap-position indication on the control at FC 12
displays 0 for neutral.
c.
Position indicator dial pointer is pointing directly at
N or 0 for neutral.
d.
Measure the voltage difference between the S
and L bushings using an approved voltmeter or the
SAFE-TO-BYPASS feature on the CL-7 control. The
voltage should measure zero or very close to zero.
9.
With regulator in neutral position, disable the motor
operation by taking the following steps:
a.
Set the CONTROL FUNCTION switch to OFF.
b.
Set the POWER switch to OFF.
c.
Open the V1 knife switch (and V2, V6, and V8
switches if present).
d.
Remove the 6 Amp motor fuse.
10. Close load (L) disconnect switch.
11. Open bypass switch. The regulator is now energized.
12. Replace 6 A motor fuse, close V1 knife switch (and
V2, V6, and V8 switches if present), and set POWER
switch to INTERNAL.
13. Refer to Service Information MN225003EN, CL-7
Voltage Regulator Control Installation, Operation, and
Maintenance Instructions, for information on the CL-7
voltage regulator control, including placing the control
into service and initial programming.
Procedure B: Regulator bypass-disconnect switch
1.
Verify from regulator nameplate that control circuit is
connected for proper regulated system voltage.
2.
Set CONTROL FUNCTION switch to LOCAL MANUAL
and POWER switch to EXTERNAL.
3.
Knife switches on back panel should be set with V1
(potential switch) (and V2, V6, and V8 switches if
present) open (pulled out) and C (CT shorting switch)
closed (pushed in).
4.
Apply 120 V (or other voltage as indicated by the decal
on the control) to external source terminals.
5.
Lift raise-lower switch to operate tap-changer two or
three steps, then depress raise-lower switch to return
tap-changer to neutral position; these steps verify
that the mechanism is functional. When on neutral,
the neutral light will glow continuously and position
indicator will point to zero or N for Neutral.
9
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