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Easy-Start ES Instruction Manual
Troubleshooting
SECTION 5
5-4
Troubleshooting Guide
C. Problem: The motor rotates but does not
reach full speed. The RUN LED is on; but
the END OF RAMP LED does not come on.
Check:
1. DIP switch DS1 and DS2 settings against
motor FLA.
2. Current limit adjustment may be set too
low and will not provide enough starting
torque; turn
Curr Lim
adjustment CW to
increasing starting current. Measure the
motor current with a clamp-on ammeter.
3.
Curr Trip
LED - If the current limit
adjustment has been turned to its full CW
position and the current trip LED comes
on, before the motor reaches full speed,
the Easy-Start ES may be undersized for
the motor application. (See Over-Load
Time-Current Characteristics Figure 3-1.)
Try turning curr trip adjustment full CW.
Try starting the motor in a reduced load
condition; or if possible, remove the load
from the motor completely and try for a
successful start. This will help confirm
that the Easy-Start ES is operating to its
specifications. After a normal start has
been completed, both the
RUN
LED and
END OF RAMP
LED will be on, and
generally, for most normal applications,
this will take less than 20 seconds. If the
motor cannot be started, change the logic
board.
D. SCR Diagnostic Tests
1.
Shorted SCR
- Measure from:
Line-A to Load-A
Line-B to Load-B
Line-C to Load-C
The resistance reading should be high or
near infinity. A near zero reading
indicates a shorted SCR. If any phase is
shorted, replace the defective SCR.
There are two basic types of SCRÕs used
in Easy-Start ES:
Isolated block SCRÕs containing 2 SCRÕs
internally connected; the entire SCR block
should be replaced in this case.
Non-isolated hockey puk SCRÕs externally
connected; in order to determine which
SCR to replace, the copper strap or buss-
bar connected between heatsinks, will
have to be removed so that the SCRÕs can
be measured individually.
2.
Open or Shorted Gate
- Remove the 3
gate plugs, J-101, J-201, J-301, from the
logic board. The ohmmeter
measurements should be made between
pins 1 to 4 and pins 3 to 6 of each plug.
The typical ohmic value should be
between 5 and 200 ohms. If readings of
near zero ohms, or near infinity, are
measured, replace the SCR.
Hockey puks should always be measured
installed in pressure clamps, or false
readings may result.
All power should be turned OFF when making
ohmmeter measurements.
Caution
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