limiting functions. Other motor drive units may be powered
and controlled directly by the voltage regulator control. In
either case, the voltage regulator control is responsible for
initiating a tap change. The motor drive model will be listed
on the voltage regulator nameplate. For all EVER-Tap™
manufactured prior to 2020, the voltage regulator was
supplied with the ETMD-A motor drive unit. Function Code
49 may be used to select the motor drive or tap changer
model.
The CL-7 voltage regulator control utilizes an additional
actuator board for use with the ETMD-A motor drive unit
to power the tap changer. A 100 µF run capacitor and a 50
µF start capacitor are required for operation of the ETMD-A
with actuator board. Back panel wiring in the control box for
the ETMD-A is not compatible with Quik-Drive tap changers.
The CL-7 will trigger the actuator board to make a tap
change. If limit switches are not tripped, the actuator board
energizes the motor. After some rotation of the drivetrain,
an operating switch is engaged to signal that the motor is
responding to the command. Failure to receive this signal
within several seconds will cause the actuator board to
abort the tap change. In approximately 2 seconds, under
normal operating conditions, the operating switch will be
released, triggering the actuator board to stop the motor
drive unit and signal to the control that the tap change is
complete.
Operating sequence
Within the interval of time the motor drive unit is rotating,
the tap changer mechanism drives different linkages to
sequence the switch modules’ operations. First, a bypass
switch opens causing all the load current of one movable
contact to flow through the vacuum interrupter. Second,
the vacuum interrupter opens, stopping current through the
movable contact. Third, the movable contact is moved from
one stationary tap to the next tap without electrical arcing
because the current was previously interrupted. Fourth, the
vacuum interrupter closes and current flow is reinitiated
through the movable contact. Finally, the bypass switch
closes causing the load current to be shunted around the
vacuum interrupter.
Reversing switch
The reversing switch function changes the polarity of the
tapped winding. When an EVER-Tap tap-changer is in the
neutral position through position 16 Raise, the reversing
switch is in position B. When the tap selector moves
between the neutral position and position 1 Lower, the
reversing switch moves between position A and B.
EVER-Tap important operational information
WARNING
The user of this equipment should be properly trained
in the operation of voltage regulators . Wiring and
operation of the EVER-TAP™ voltage regulator is
different than other voltage regulators equipped with
CL-7 controls . Only attempt to commission and operate
an EVER-Tap™ voltage regulator after thoroughly
reading and understanding this document as well as the
voltage regulator and control manuals .
EVER-TAP controls and control boxes
Important information pertaining to a CL-7 control and
control box equipped for use with and EVER-Tap voltage
regulator:
●
●
EVER-Tap control boxes should only be used on
EVER-Tap™ voltage regulators .
The ETMD-A motor
drive unit requires a special motor drive control circuitry
and capacitor configuration that is different from that
of Eaton’s Quik-Drive tap changers. The wiring of the
back-panel inside the control box and the wire harness
to the control cable are not compatible with Quik-Drive
equipped voltage regulators.
●
●
Use the CL-7 equipped with an actuator board only
with an ETMD-A motor drive unit on an EVER-Tap™
voltage regulator .
Undesirable performance and unsafe
operating conditions may result if any other control
configuration is used.
●
●
The actuator board interfaces with the motor drive to
ensure proper actuation of the tap changer.
●
●
The actuator board monitors position limit switches and
operation cycle switches.
●
●
Starting and stopping functionality is augmented by the
actuator board.
EVER-Tap Internal/external/auxiliary power
Important information pertaining to powering of the CL-7
control when operating an EVER-Tap voltage regulator:
●
●
Two separate internal power circuits exist for the actuator
board and CL-7 sensing and power circuits.
●
●
The
V1
knife switch powers the
VS
sensing circuit and
VM
control power circuit.
●
●
The
V8
knife switch powers the actuator board for the
tap changer motor drive.
●
●
Do not short
V1
to
V8
.
V1
and
V8
are both nominally
120V to ground, however V1 and V8 are opposite phase
resulting in a nominal 240V from
V1
to
V8
.
●
●
Select
INTERNAL
power on both the CL-7 front panel
and the auxiliary swing panel power switches.
●
●
External power to the CL-7 control and actuator board to
control the RMV-SVR tap changer may be supplied using
22
VR-32 and EVER-Tap™ Voltage Regulator
InstallatIon, operatIon, and MaIntenance InstructIons
MN225008EN June 2020