Howard SVR1 Regulator - Manual (Page 13)

Switch-Pad™ SVR-1 Step Voltage Regulator
Document No. 2.4.114
Revision: 03
Issued: March, 2012
13 Copyright © 2012 Howard Industries, Inc.
MAINTENANCE
OPERATIONAl CHECkS
Periodic operational checks should be performed to verify
proper operation of the control unit, the tap changer
mechanism, and the HI-AMP™ limiters. These checks
can be made while the regulator is in service. Output
voltage should be monitored during the procedure using
a voltmeter connected to the control unit’s test terminals.
The control unit manual should be referenced for further
information.
The following procedure should be followed to check
operation of the control unit, the tap changer mechanism,
and the HI-AMP™ limiters.
1. Referring to control panel indicators, make sure
the regulator is “IN-BAND” and that line drop
compensation is set to zero (Return line drop
compensation to the proper setting after completing
the checklist.).
2. Verify that the voltmeter indicates a voltage within
one-half of the bandwidth tolerance.
3. Place the AUTO/MANUAL switch in the “MANUAL”
position.
4. Using the RAISE/LOWER switch run the tap changer
several steps in either direction, until control panel
indicates an out-of-band condition.
5. Return the AUTO/MANUAL switch to the “AUTO”
position. After a time delay, the control will
automatically return the regulator to an in-band
condition.
6. Repeat steps 3 through 5, but in the opposite
direction.
7. Check operation of the HI-AMP™ limit switches
(located on the either side control position indicator)
by attempting to run the regulator beyond the limits
set by the switches. The limit switches should stop
tap changer operation at the corresponding tap
position.
GENERAl INSTRUCTIONS
SVR-1 step voltage regulators are designed for long
life and trouble-free operation. Periodic inspection and
maintenance will prolong life and minimize the likelihood
of service interruptions. Proper operation can be checked
without removing the regulator from service. Follow
the procedures in this section to perform in-service
inspection and maintenance.
The operational life of a regulator will depend somewhat
on the application and environment; hence, the
frequency and scope of maintenance should be tailored
to a regulators specific situation. Regulators subjected
to higher loads and/or more frequent tap changer
operations should be inspected more frequently than
regulators exposed to lighter duty.
In certain situations it might be advisable to periodically
remove a regulator from service for thorough testing and
internal inspection. In addition, anytime an operational
regulator is removed from service for any reason, the
opportunity should be used for testing and a thorough
inspection, following the procedure in the pre-installation
checklist (page 5) at a minimum.
The procedures outlined below are intended to verify
proper operation of the control unit, tap changer
mechanism, HI-AMP™ limiters, and cooling fans (if
present), and to check for tap changer contact wear and
the condition of the insulating fluid. Other checks may be
advisable for certain regulators, particularly those serving
special applications or operating in severe environments.
The user should contact Howard Industries Regulator
Division for additional information.
CAUTION
Operation of the regulator to extreme tap positions
can produce a line voltage that is above or below the
desired operating limit of the load, causing property
damage.
WARNING
These maintenance instructions should be followed
to ensure proper and safe regulator operation.
Tampering or maintenance by unqualified personnel
can degrade operational performance and can cause
unsafe conditions that can cause death, serious
personal injury, or property damage.