Cl-2A Regulator Control - Section; Introduction; Specifications; Pre-Installation Operational Check - Cooper VR-32 Installation, Operation And Maintenance Instructions

CL-4C REGULATOR CONTROL • Section 2

INTRODUCTION

The CL-2A Control
The purpose of the CL-2A Control, as any control, is to initiate
output actions in response to changing input conditions, as a
function of the programmable control characteristics (settings).
The regulator control must also perform to the ANSI C57.15
Class I accuracy specificiations overthe -4O
must be sufficiently well protected against damaging transients
and surges, it must be reliable, and it must be cost effective.
The CL-2A regulator control meets these requirements.
The CL-2A Control is an enhancement of the proven CL-2
control design. This concept utilizes much of the same hard-
ware as the CL-2, but the printed circuit board has been
redesigned to incorporate the latest in microprocessor technolo-
gy. Additional design changes include:
1. The 5-position rotary control switch has been replaced with
two toggle switches to help reduce operator error.
2. The test rheostat was removed to improve reliability and
reduce the chance of operator error.
3. The drag hand reset and neutral light test functions have been
separated and are now implemented via a toggle switch.
4. The neutral light was replaced with a high intensity amber
neon cartridge to improve visibility.
These changes are directed at making the CL-2A easier to
operate and to further improve upon the reliability that was char-
acteristic of the CL-2.
PRE-INSTALLATlON OPERATIONAL CHECK
The CL-2A Control has the facilities for either manual or auto-
matic operation of the tap changer, with either an internal source
of power (the regulator) or an external source. To perform an
operation check of the control before installing the regulator, fol-
low these steps:
1. Connect the three high-voltage bushings together and
ground them.
2. Place the POWER switch in the OFF position and the
AUTO/OFF/MANUAL switch in the OFF position.
3. Connect a 120 volt 50/60 hertz source to the EXTERNAL
SOURCE terminals. The grounded side of the external
source must connect to the ground (white) terminal on the
control.
4. Place the POWER switch in the EXTERNAL position.
5. Move the AUTO/OFF/MANUAL switch to MANUAL and
depress and hold the RAISE/LOWER momentary toggle
switch. Allow the tap changer to operate to 16L, the 10%
buck position.
6. Now hold up on the RAISE/LOWER momentary toggle
switch. Allow the tap changer to operate to 16R, the 10%
boost position.
SPECIFICATlONS
A. Physical size
B. Weight
C. Burden at 120 volt
D. Operating temperature range
E. Control Svstem Accuracy
7. Move the AUTO/OFF/MANUAL switch to AUTO. Turn the
8. Turn the coarse VOLTAGE SETTING clockwise for a RAISE
o o
C, +85 C range. It
9. Return the tap changer to neutral. When on neutral, the
10. Place the AUTO/OFF/MANUAL switch in the OFF position.
11. Press down on the momentary toggle switch labeled DRAG
12. Turn the POWER switch to OFF and disconnect the 120 volt
13. Remove the shorting connection from the high-voltage
IN-SERVICE CALIBRATlON CHECK
The calibration of the CL-2A Control can be checked while the
regulator is in-service. However, the user must understand that
field calibration checks are only an indication of calibration, and
are not nearly as precise as the procedure described in the
Control Trouble Shooting section of this manual, which is a labo-
ratory process.
1. Connect the accurate true-RMS responding voltmeter of at
2. If line drop compensation is being used, turn the LDC control
3. Manually operate the regulator three or four steps above the
4. Manually operate the regulator three or four steps below the
5. The average of these two voltage readings is approximately
6. Return the control knobs and switches to their previous posi-
coarse VOLTAGE SETTING counterclockwise for a LOWER
operation. Permit the tap changer to operate for approxi-
mately eight to ten steps. Check to ensure that the operation
counter is registering tap changes.
operation. Permit the tap changer to operate for approxi-
mately eight to ten steps, checking the operation counter to
ensure it is registering tap changes.
NEUTRAL LAMP will light and the POSITlON INDICATOR
will point to zero.
HAND RESET. The position indicator drag hands will reset
to neutral.
source from the EXTERNAL SOURCE terminals.
bushings and disconnect the ground.
least 3000 ohms impedance to the VOLTMETER terminals.
to the OFF position.
set point (voltage level setting), and then place the
AUTO/OFF/MANUAL switch on AUTO. After the time delay
period, the regulator should step down to within the top band
edge. (Example: 120 V and 2 V BW = 121 V top band edge.)
set point (voltage level setting), and then place the
AUTO/OFF/ MANUAL switch on AUTO. After the time delay
period, the regulator should step up to within the lower band
edge. (Example: 120 V and 2 V BW = 119 V lower band
edge.)
the set point of the control.
tions.
10-3/8"W, 13"H, 6"D
-40
ANSI C57.15 Class I
S225-10-5
9-3/4 Ibs.
6VA
o o
C to +85 C
2-2