Section 1: Control front panel
Lower panel (grey)
The lower (lineman's) section of the front panel contains
components and features used to operate the voltage
regulator. This section is similar to that of other controls in
Eaton's Cooper Power series CL line. Refer to
.
Power switch
In the External position, the control and tap-changer motor
are powered from an external source connected to the
external source terminals (120 Vac standard, 240 Vac as
indicated by decal). In the Internal position, the control and
motor are powered from the regulator. In the Off position,
no power is delivered to either the control or the motor.
Control function switch
In the AUTO/REMOTE position, the tap-changer motor can
be controlled by either the front panel (auto) or remotely
by SCADA. In the OFF position, manual and automatic
operation and remote motor control are inhibited. In the
LOCAL MANUAL position, automatic operation and remote
motor control are inhibited and the tap-changer may be
raised or lowered locally by momentarily toggling the RAISE/
LOWER switch.
Manual raise/lower switch
This switch allows the operator to manually raise or lower
the tap-changer motor when the control switch is set to
LOCAL MANUAL.
Supervisory off switch
This is a momentary switch used only to inhibit digital
communications. When the LED in the top left corner of the
switch is not illuminated, SCADA has full capabilities. When
the LED is illuminated, SCADA may only read the control
database.
Drag-hand reset switch
This is a momentary switch that operates a solenoid in the
Position Indicator to move the drag hands to the present tap
position.
Neutral light
This is an indication that the tap-changer is in the neutral
position. See
Section 2: Control Installation: Determining
for more detailed guidance on determining
when the regulator is in the neutral position.
WARNING
Explosion Hazard . Bypass a regulator with the line
energized only if the position indicator, the neutral
light, and the control tap position indicate neutral and
the voltage measured between the source and load
bushings using an approved voltmeter is zero . If both
neutral indicators do not indicate neutral or there is a
voltage between the source and load bushings, the line
should be de-energized to avoid shorting part of the
series winding and resultant high circulating current .
Failure to comply can result in death or personal injury
and equipment damage .
VR-T206 .0
Voltmeter Terminals
These terminals allow the connection of a voltmeter to
measure the potential sensed by the control between the
load (L) bushing and the source load (SL) bushing of the
regulator. There are two terminals: a red positive and a
green ground. The voltmeter terminals are equipped with
protection to prevent back-feeding of the regulator through
the control winding.
Fuse
The motor fuse is a 125 V, 6 A, fast-blow fuse.
External source terminals
NOTICE
Equipment damage . Be mindful of polarity when using
an external source . Polarity reversal will result in control
damage .
VR-T201 .0
Providing 120 Vac to these terminals powers the control and
tap-changer motor. Controls wired for an external source of
220–240 Vac have a decal specifying “240” at the terminals.
Caution should be taken when connecting external voltage
to the terminals. The voltage should be checked to insure
the polarity is correct. The black terminal is the hot terminal,
the white is the neutral terminal, and the green, which is
directly connected to the chassis, is the external supply
ground.
Consult
Section 1: Control Front Panel: Connecting
power to external source terminals
before applying
external power to the control.
NOTICE
Equipment damage . Only a true 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 control .
VR-T204 .1
3
INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS
MN225003EN April 2018
CL-7 Voltage Regulator Control