approved processes to put the voltage regulator into
service. Once the regulator is in service, apply power to
the control by closing the V1 switch on the back panel.
Once line power has been connected, perform the
operations check:
1. Replace the motor fuse.
2. Set the control POWER switch to INTERNAL.
3. Set the CONTROL FUNCTION switch to LOCAL
MANUAL.
4. Enter FC 12 – Present Tap Position.
5. While monitoring FC 12, lower the tap position by
pressing the LOWER control switch. The displayed tap
position will decrease and the regulator will lower one
tap position.
6. Lower the regulator until the LOW out of band
indication is observed.
7. Place the CONTROL FUNCTION switch into the AUTO/
REMOTE position. The regulator will time-out per the
time-delay value entered at FC 3, then will tap up until
back into band.
8. Repeat the process by manually tapping to out-of-band
high.
9. Return the regulator to the NEUTRAL position by
pressing the appropriate RAISE or LOWER control
switch. The NEUTRAL LIGHT will illuminate.
10. Check the drag hand reset circuit by depressing the
DRAG HAND RESET switch. The drag hands located in
the position indicator will reset to the position indicator
pointer position.
11. Returned to the regulator to the neutral position when
testing is complete.
Shop operations check
The shop operations check is essentially identical to the
field check except that it is performed in the shop using a
120 volt power supply instead of using line power to power
the control. With a properly functioning control panel and
properly connected power supply, the high voltage bushings
on the regulator will NOT be energized via a back-fed control
signal. However, it is recommended that the bushings
be connected to ground as a safety precaution when
performing any control panel powered testing.
For detailed instructions on externally powering of a voltage
regulator control, refer to Service Information MN225003EN
CL-7 Voltage Regulator Control Installation, Operation, and
Maintenance Instructions for information.
To power the control for the operations test:
1. Make sure that the V1 switch on the back panel is
open.
2. Connect 120 Vac to the EXTERNAL SOURCE terminals
located on the control front panel. Be certain the
voltage polarity is correct when applying power to the
control - positive to the black terminal, neutral to the
white terminal and ground to green.
With 120 volts applied to the external source terminals,
perform the following:
1. Replace the motor fuse.
2. Place the control POWER switch to EXTERNAL.
3. Place the CONTROL FUNCTION switch to LOCAL
MANUAL.
4. Enter FC 12 on the control keypad – Present Tap
Position.
5. While monitoring FC 12 lower the regulator by pressing
the LOWER control switch. The displayed tap position
will decrease and the regulator will lower one tap
position.
6. While monitoring FC 12, return the regulator to its
original tap position by pressing the RAISE control
switch.
7. Check the drag hand reset circuit by depressing the
DRAG HAND RESET switch. The drag hands located in
the position indicator will reset to the position indicator
pointer position.
8. Check the neutral light circuit by manually raising or
lowering the regulator to the NEUTRAL position. The
NEUTRAL LIGHT will illuminate.
9. Returned to the regulator to the neutral position when
testing is complete.
DANGER
Explosion Hazard. Voltage regulators are subject to high
circulating current during bypass switching. Refer to
Service Information MN225003EN Voltage Regulator
CL-7 Series Control Installation, Operation, and
Maintenance Instructions for information on the CRA
Control, and refer to the instruction manual supplied by
the voltage regulator manufacturer for specific safety
procedures for bypass switching. Failure to comply will
result in severe personal injury or death. VR-T214.0
WARNING
Hazardous Voltage. When applying external power to a
control, an isolated power supply must be used. If the
power supply is not isolated and is connected with the
incorrect polarity, it will cause the 120 Vac supply voltage
to be shorted to ground. This can result in a shock
hazard, damage to the control, damage to regulator
componentry, and damage to the power supply. VR-T245.0
22 CL-7 control replacement assembly installation instructions and service information MN225017EN October 2016