Siemens
®
Corporation voltage regulator
application
The replacement procedure may be performed in the shop
or the field. The regulator must be bypassed or removed
from service prior to installing the CRA kit. Always bypass
the regulator when installing the CRA kit in the field to
prevent opening the CT circuit while the regulator is under
load.
ote:N The control cable may be an actual cable or a flexible
conduit. For these instructions, it will be referred to
as "control cable".
1. Bypass the regulator or remove it from service.
2. Open the existing control box and swing out the control
front panel. Remove the front panel by disconnecting
the jack plug and lifting the control off of its hinges.
3. If the incoming control cable leads are not marked or
color-coded, place appropriate wire markers on the
control cable leads and mark the leads for reference
later.
4. Disconnect the incoming control cable leads from the
female jack plug located on the back of the control box.
If the tap-changer motor capacitor is located in the
control box, disconnect the leads from the capacitor
and remove the capacitor for reinstallation in the CRA
control box.
5. Remove the incoming control cable-retaining nut and
remove the cable from the control box.
If the regulator is fitted with a non-flexible conduit
housing the control leads, it will be necessary to modify
or replace this conduit with a flexible conduit to allow
interface to the CRA control box.
6. Remove the cable compression connector (cable grip)
from the existing control box.
7. Remove the nameplate from the old control box
assembly and retain, with the hardware.
8. With an adjustable wrench (or appropriate socket
wrench), remove and retain the bolts holding the
control box on the regulator.
9. Remove the existing control box assembly from the
regulator.
10. Place the supplied universal bracket over the mounting
bosses of the regulator and secure with bolts retained
in Step 8.
11. Place the CRA control box on the universal bracket and
secure it to the regulator with bolts, washers, lock-
washers, and nuts provided.
12. Attach the nameplate to the front of the CRA control
box with the hardware retained in Step 7.
13. Ground the control cabinet via the ground boss located
on the side of the cabinet.
14. Examine the control cable. Allow approximately 12" of
lead length to protrude past the end of the conduit nut.
This will facilitate connection to the top terminal strip
and knife switches located in the CRA control box.
15. Remove the cable grip nut and rubber cable grommet
from the cable entrance of the new control box.
16. Place the cable grip nut over the existing control cable.
Select one of the two supplied cable grommets that
best fits the existing cable; place the grommet over the
control cable.
1 7. If the motor capacitor was located in the old control
box, do not cut the terminals from the ends of the
capacitor wires.
Cut all other terminals from the ends of the cable
conductors.
18. Strip the insulation back approximately 5/16 of an inch
on each lead to be connected in the new control box.
19. Insert the control cable into the control-box cable grip
connector, seat the rubber grommet, and tighten the
cable grip nut.
20. V6 connections and source-side PT input:
A. If there is no source-side PT input, or if there is a
source-side PT input, but the source-side voltage is
to be calculated by the control, the control box has
been pre-configured for this type of operation; no
further action is required.
WARNING
Hazardous Voltage. The control box must be solidly
earth grounded. Failure to comply can result in severe
personal injury and equipment damage. VR-T216.0
DANGER
Explosion Hazard. Voltage regulators are subject to
high circulating current during bypass switching.
Refer to Service Information MN225003EN CL-7
Voltage Regulator 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
Flashover Hazard. Opening the CT circuit under load
will produce high voltages in the control box. Always
bypass the regulator when installing the CRA to prevent
opening the CT circuit while the regulator is under load.
Failure to comply can result in severe personal injury or
death. VR-T215.0
5CL-7 control replacement assembly installation instructions and service information MN225017EN October 2016
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