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M-2299 Application Guide
6.2
Voltage Source Switch
The
VOLTAGE SOURCE
switch will disconnect all
power from the unit when in the
EXT
position with
no source connected to the front panel voltage and
motor power inputs.
▲
CAUTION:
Do not reverse the ground and hot
wires when connecting an external source. A 3 AG
(F2) is installed to protect the relay from damage if
these connections are accidentally reversed.
With the
VOLTAGE SOURCE
switch in the
EXT
position, the sensing and motor power circuits are
connected to the
VOLTAGE IN
binding post on the
front panel. The unit can be tested using an external
120 V rms source of proper polarity applied to these
terminals. Testing can be accomplished by adjusting
the amplitude of the external source.
7.0
Maintenance
Due to the nature of the circuitry in the M-2001
Tapchanger Control, field repair is not
recommended. All units are fully calibrated at the
factory prior to shipment; there is no need to re-
calibrate a unit prior to initial installation. In the
event that a unit does not operate properly, it
should be established that the problem is caused
by a malfunction of the Tapchanger Control and not
caused by an external fault or wiring error. Check
for blown fuses on the Adapter Panel. If the
Tapchanger Control is still not operating properly,
set the
AUTO/OFF/MANUAL
switch on the Adapter
Panel to
MANUAL
. Once this is accomplished, the
Tapchanger Control can be disconnected and
returned to Beckwith Electric. Pack the unit carefully
(in the original carton if possible), assuring that
there is adequate packing material to protect the
contents.
NOTE:
Any equipment returned for repair must be
sent with transportation charges prepaid. The equip-
ment must remain the property of the user. The war-
ranty is void if the value of the unit is invoiced to
Beckwith Electric at the time of return or if the unit
is returned with transportation charges collect.
If under warranty, units will be repaired rapidly and
returned at no cost and with return transportation
paid if the fault is found to be due to workmanship
or failure of material. If a unit is under warranty and
express shipment for return of the repaired unit is
requested, shipping charges will be billed at the
current rate. If the fault is due to abuse or misuse,
or if the unit is out of warranty, a modest charge will
be made. Repair can normally be expected to take
two weeks, plus shipping time. If faster service is
required, it should be requested at the time of
return.
NOTE:
Adapter panels returned with only a blown
fuse are not covered by warranty and a nominal re-
pair charge will be made for replacement of the fuse.
Please check the fuses before returning the adapter
panel for repair in order to avoid unnecessary repair
charges.
To help in analyzing the problem, a complete
description of the malfunction and conditions leading
to the failure should be included with the unit.
