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M-0245C Instruction Book
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.
To help in analyzing the problem, a complete
description of the malfunction and conditions leading
to the failure should be included with the unit.
However, if you choose to repair the unit, it is
necessary to be completely familiar with the circuitry
involved, and have an adequate understanding of
field effect devices. Be sure to carefully read the
WARNING page at the beginning of this manual.
To gain access to the circuit board, remove the top
and bottom cover of the unit. Components can then
be easily tested or changed. It is suggested that first
a visual inspection be made for any component that
does not appear normal or appears to have
overheated. Analysis of the circuit will then often lead
to the cause of the failure and components that need
to be replaced.
If no obvious problems exist, it is suggested that the
TEST and CALIBRATION PROCEDURES be
followed until a portion of a circuit is detected which
does not perform as expected or until a calibration
point is found which will not meet requirements. These
procedures should lead to a determination of the
defective component.
▲
CAUTION: Do not reverse polarity of the V.T.
leads to the rear terminal block if the unit is taken out
of service for maintenance.
The possibility still remains, however, that under certain
conditions (i.e., loose wires causing an intermittent
contact) the internal circuitry may not be able to
detect the loss, and the output contact could close
when the unit is initiated. Therefore, as a safeguard,
the “Close to Enable Sync Check” contact from TB1-
20 to TB1-21 should be closed only during the time
required for the transfer sequence to be completed.
3.0
Maintenance
Due to the extremely sophisticated nature of the
circuitry in the M-0245C, 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. Calibration
is only required after a component is replaced.
In the event that a unit does not operate properly, it
should be established that the problem is caused by
malfunction of a Beckwith Electric unit and not caused
by an external fault or wiring error. Once this is
determined, the entire unit should be 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 equipment must remain the
property of the user. The warranty 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.
Summary of Contents for M-0245C
Page 1: ...Instruction Book M 0245C High Speed Sync Check Relay ...
Page 23: ... 14 M 0245C Instruction Book Figure 6 Component Location B 0207 ...
Page 24: ... 15 Figure 7 Variable Speed Motor Application Component Location B 0264 ...
Page 25: ... 16 M 0245C Instruction Book ...
Page 26: ... 17 Figure 8 Schematic X 0245C ...
