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6/07 A1
TROUBLESHOOTING
The MotorSaver
®
Plus will display a fault code alternating with a number or with “run” when it is in a
trip condition. If the unit is showing a fault code (see Table 4) alternating with “run,” it has tripped on
a current (amperage) condition. If the fault code is alternating with some number (voltage reading or
zero), 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 mode that requires a manual reset. 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.
PROBLEM SOLUTION
The unit will not start. Display
alternates “rP” with the
DISPLAY/PROGRAM
parameter value.
The voltage inputs are reverse phased. If this is the
initial start-up, swap any two of the leads connected to
L1, L2, or L3 on the 777-P to correct the problem. If the
overload relay has been previously running, the power
system has been reverse phased. Check the phase
sequence of the incoming power lines. Note: L1 must
be tapped from conductor Phase A, L2 from B, and L3
from C for correct power factor measurements on
remote communications.
The unit will not start. Display
alternates “SP”, “ub”, “HI”, or
“Lo” with the DISPLAY/
PROGRAM parameter value.
The incoming voltage is not within the limits
programmed in the VUB, HV, and LV settings. Adjust
the DISPLAY / PROGRAM switch to read the incoming
line voltage values. Correct the incoming power
problem and check programmed limits to verify they are
correct.
Display alternates “SP”, “ub”, or
“oc” with “run.”
The overload relay has tripped on the fault shown on
the display and is timing down RD2 before restarting.
Display alternates “uc” with
“run.”
The overload relay has tripped on undercurrent and is
timing down RD3 before restarting. If undercurrent is
not a normal condition for this installation, check for
broken shafts, broken belts, etc.
Display is showing a solid “SP”,
“ub”, or “oc.”
The unit has tripped on the fault shown and a manual
reset is required because of the programmed setting in
#RF. Check the system for problems that would
produce the single-phase, overload or current
unbalance fault, such as a jam.
Display is showing a solid “uc.”
The unit has tripped on undercurrent and a manual
reset is required because of the setting in #RU. Check
the system for problems that would produce a loss of
load such as a broken belt or a lack of liquid to pump.
Display is showing a solid “CF.”
The unit has tripped on current single phasing, but was
not single phased by the incoming voltage. Check for
damaged contacts or loose wiring.
Display is showing a solid
“GrF.”
A ground fault current greater than the programmed GF
value has been detected. A manual reset is required.
Check the motor for insulation breakdown.
Table 4. Troubleshooting
