Section 1: Control panel
Lower panel (grey)
The lower section of the control contains components
which are similar to other controls in Eaton's Cooper Power
series CL line of controls. Refer to Figure 1-1.
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 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
Manual.
Supervisory switch
This switch is used for digital communications only. When
set to On, SCADA has full capabilities. When set to Off,
SCADA may only read the control database.
Drag-hand reset switch
This switch operates a solenoid in the position indicator to
move the drag hands to the present tap position.
Neutral light
This is the primary indication that the tap-changer is in the
neutral position. See the Control Installation: Determining
Neutral Position section of this manual.
Voltmeter terminals
These 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 regula-
tor]. There are two terminals: a red terminal and a white
terminal.
Fuse
The motor fuse is a 125 V, 6 A, fast-blow fuse.
External source terminals
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 terminal(s). 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.
The CL series control can be powered externally through
the front ‘external power’ binding posts. The control panel
itself utilizes 120 Vac to operate. However, there are
optional configurations in which a 240 Vac control cabinet
is supplied. Whichever the case, care must be taken when
applying an external source to the control.
CAUTION
Equipment damage. Be mindful of polarity when using
an external source. Polarity reversal will result in control
damage.
CAUTION
Equipment damage. Only an 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 front panel.
3
CL-6 SERIES CONTROL INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225016EN January 2016
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