Howard SVR1 Regulator - Manual (Page 12)

Document 2.4.114 SVR-1 Step Voltage Regulator
Copyright © 2012 Howard Industries, Inc. Document No. 2.4.114
Revision: 03
Issued: March, 2012
12
REMOVING A REGUlATOR FROM SERVICE
T he following procedure should be used to remove a
regulator from service. For additional information refer to
the manual supplied with the control unit (Switch desig-
nations referenced below are applicable to the HI/ICMI
control.).
1. Set MOTOR CONTROL AUTO/MANUAL switch to
MANUAL position.
2. Using the MOTOR CONTROL RAISE/LOWER switch,
run the regulator tap changer to the neutral position
as indicated by the tap position indicator dial.
3. Confirm that the regulator is in the neutral position.
The tap position indicator should point to “0”, and
the NEUTRAL LIGHT on the control panel should be
continuously illuminated. Do not proceed unless
both the tap position indicator dial and the NEUTRAL
LIGHT indicate that the regulator is in the neutral
position.
4. Place MOTOR CONTROL switch in the “OFF” position.
5. Remove the MOTOR fuse.
6. Place the MAIN POWER switch in the “OFF” position.
6. Close the bypass switch*.
7. Open the source “S” disconnect switch*.
8. Open the load “L” disconnect switch*.
9. Open the source/load “SL” disconnect switch (delta
connections only).
*Note: A combination by-pass/disconnect switch can be
used instead of separate switches to by-pass and discon-
nect in a sequential operation.
RETURNING A REGUlATOR TO SERVICE
After removing a regulator from service, it can be safely
returned to service according to the procedure discussed
on pages 10 and 11.
DANGER
A regulator must never be by-passed unless it has
first been placed in the neutral position. By-passing
a regulator not in the neutral position will cause an
internal short circuit and will cause death or serious
personal injury, and property damage