Powering the control using external power
The control can be powered using an external power
sources. Before applying an external source, perform
the following steps to insure that the regulator does not
operate and step off of neutral before installation:
1. Open the V1 (and V6 if present) switches on the back panel
2. Set POWER switch to OFF
3. Set CONTROL FUNCTION switch to OFF
4. Remove the 6-amp motor fuse
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.
1. Place 120 volts 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.
2. While the CONTROL FUNCTION switch remains in
the OFF position, move the POWER switch to the
EXTERNAL position.
After applying power, the control can be programmed.
Programming of the CRA control front panel is covered in
the Service literature shipped with the CRA. The standard
control sent with a CRA is Eaton's CL-7 control. Bulletin
B225-12017 CL-7 Control Reference is a guide to the basic
controls settings and functionality. For more complete
information, consult Service Information MN225003EN
CL-7 Voltage Regulator Control Installation, Operation and
Maintenance Instructions.
Operations check
After control programming is complete, an operations
check should be performed to confirm correct functioning
of the CRA. The operations check can be performed on the
regulator while in the shop or in the field.
Field operations check
The voltage regulator operations checks can be performed
in the field by connecting to line power. The regulator may
be powered by closing the disconnect switches, opening
the bypass switch and putting the regulator into full
operation or if possible, powered by closing the source-side
disconnect switch while maintaining a closed bypass switch
and opened load-side disconnect switch.
To apply line power to the control there are two methods:
1. When bypass switching is performed using 3 separate
switches: If the bypass switches being used are not
single-pull type, line power can be applied by closing
the source switch only. Once the source disconnect
switch is closed, apply power to the control by closing
the V1 switch on the back panel.
2. Putting the regulator into service: Using any type of
bypass switch (single-pull or individual switches), power
can be applied by closing the disconnect switches,
opening the bypass switch and putting the regulator
fully into service. Make sure that the regulator is in the
neutral position before starting the process and verify
this by using three independent methods. Use locally
IMPORTANT
Carefully read the steps and warnings before performing
any operations checks.
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
DANGER
The operations check involves switching the voltage
regulator off of the neutral position. This can safely be
done with the source disconnect switch and bypass
switch closed and the load disconnect switch open.
Once the operations check is completed, the regulator
must be returned to the neutral position and the
position verified using three independent methods
before the regulator is bypassed into service. Failure to
do so can result in serious injury or death. VR-T246.0
IMPORTANT
Pay particular attention to correctly setting FC 49. This
settings should be set to match the manufacture of the
voltage regulator and/or the correct tap-changer type.
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
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
21CL-7 control replacement assembly installation instructions and service information MN225017EN October 2016
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