Troubleshooting; Operation - Motor Saver SymCom 77C Installation Instruction

TROUBLESHOOTING

Problem
Unit will not start - display
alternates "HI" or "Lo" with the
DISPLAY/PROGRAM dial
parameter value
Display alternates "oc" with "run"
Display alternates "uc" with "run"
Display is showing a solid "oc"
Display is showing a solid "uc"
Unable to change parameter -
setpoint bounces back to previous
setting
Motor starts and stops a short time
later but there is no fault indicator
Current readings are incorrect

OPERATION

Once the overload relay has been programmed, turn the MODE SELECT switch to the RUN
position. The LED display will flash RUN alternatively with a number representing the parameter
indicated by the DISPLAY/PROGRAM adjustment. After the period of time programmed into
RD1, the output contacts will close and the value of the parameter indicated by the DISPLAY /
PROGRAM adjustment will appear on the LED display.
If a message other than those indicated above is shown on the LED display, see the
TROUBLESHOOTING section to diagnose the problem.
Solution
The incoming voltage is not within the limits programmed in the HV
and LV settings. Adjust the DISPLAY/PROGRAM dial to read the
incoming line voltage value. Correct the incoming power problem
and check programmed limits to verify they are correct.
The overload relay has tripped on overcurrent and is timing down
RD2 before restarting
The overload relay has tripped on undercurrent and is timing down
RD3 before restarting. If underload is not a normal condition for this
installation, check for broken shafts, broken belts, etc.
The unit has tripped on overcurrent and a manual reset is required
because of the programmed setting in #RO. Check the system for
problems that would produce the overload fault, for example, a jam.
The unit has tripped on undercurrent and a manual reset is required
because of the programmed setting in #RU. Check the system for
problems that would produce an underload condition like a broken
belt or shear pin.
Unlock tamper guard. See page 11.
Control circuit may be wired to NC relay rather than NO relay
(see Figure 1, page 3).
Check MULT, CT ratio and/or number of wraps through the B
current window.
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10/05