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TROUBLESHOOTING
The 777-P2-DEMO will display a fault code alternating with a number or with “run” when it has
tripped. If the unit is showing a fault code alternating with “run,” it is timing down the restart delay. If
the fault code is alternating with a number (a voltage reading or ’0’), the unit will not allow the motor
to start because there is a problem with the incoming voltage. If the display is showing just a fault
code, the unit is in a manual reset mode. This could be because the number of restarts (#RF, #RU)
has expired or is not allowed. If the display reads “oFF,” a stop command was issued through the
communications network or a remote monitor.
DISPLAY
DESCRIPTION
The unit will not start.
Display alternates “ub”,
“HI”, or “Lo” with the
DISPLAY/ PROGRAM
parameter value.
The voltage is not within the limits programmed in the VUB, HV,
and LV settings. Turn the DISPLAY / PROGRAM knob to read each
line voltage value. Correct the problem by checking programmed
limits by turning the MODE SELECT knob. Compare simulated
real-time values for HV, LV, and VUB to setpoints to verify they are
correct.
Display alternates “ub”, or
“oc” with “run.”
The demo has tripped on the fault shown on the display and is
timing down RD2 before restarting. Correct the problem by
checking programmed limits by turning the MODE SELECT knob.
Return the OC and/or CUB setpoints to original setting listed in the
programming section.
Display alternates “uc”
with “run.”
The overload relay has tripped on undercurrent and is counting
down RD3 before restarting. Correct the problem by checking
programmed limits by turning the MODE SELECT knob. Return the
UC setpoint to “35” in order to stop the undercurrent fault from
occurring.
Display is showing a solid
“ub”, or “oc.”
The unit has tripped on the fault shown and a manual reset is
required because of the programmed setting in #RF. Correct the
problem by checking programmed limits by turning the MODE
SELECT knob. Return the OC and/or CUB setpoints to original
setting listed in the programming section.
Display is showing a solid
“uc.”
The unit has tripped on undercurrent and a manual reset is required
because of the setting in #RU. Correct the problem checking
programmed limits by turning the MODE SELECT knob. Return the
UC setpoint to “35” in order to stop the undercurrent fault from
occurring.
Display is showing a solid
“GrF.”
A ground fault current greater than the programmed GF value has
been detected. A manual reset is required to clear this message.
Correct the problem checking programmed limits by turning the
MODE SELECT knob. Return the GF setpoint to “5” in order to
stop the ground fault from occurring.
Press the RESET/PROGRAM button to perform a manual reset.
Display alternates “LPr”
1
with “RUN”
The overload relay has tripped on low power (LPr) and is timing
down RD3 before restarting. Correct the problem checking
programmed limits by turning the MODE SELECT knob. Return the
LPr setpoint to “30” in order to stop the low power fault from
occurring.
