Ransburg RCS-100FP Fluid Pump Kit 70945 - Manual (Page 18)

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Figure 5: Troubleshooting Guide (Continued) Figure 5: Troubleshooting Guide (Continued) Figure 5: Troubleshooting Guide (Continued) Figure 5: Troubleshooting Guide (Continued) Figure 5: Troubleshooting Guide (Continued)
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Fluid Pump Motor Speed Control Station - Maintenance
Controlller Line Fuse
Blows When a Start
Command is Initiated
Controller Line Fuse
Blows While the Motor
is Running
Motor Will Not Reach
Top Speed
Unstable Speed
General Problem General Problem General Problem General Problem General Problem Cause Cause Cause Cause Cause Solution Solution Solution Solution Solution
1. Motor shorted or
grounded
2. Control board failure
3. Motor overloaded
1. Loose or corroded con-
nection / Wiring faulty,
incorrect, or grounded
2. Control board failure
1. Low line voltage
2. Motor overloaded
3. Maximum speed set
too low
4. Current limit set too low
5. Control board failure
1. AC line voltage fluctu-
ating
2. Loose or corroded con-
nection / Wiring faulty,
incorrect, or grounded
3. Motor faulty
1. Repair or replace motor.
2. Replace control board.
3. Check shunt field current. Low shunt
field current causes excessive armature
current. If field current is adequate,
check for a mechanical overload such
as a frozen pump. Also check for a
shorted motor armature.
1. Check all terminals, connections, and
wiring between the AC line, controller,
and motor.
2. Repair or replace controller.
1. Check for 115 VAC ±10% between
TB1-L2 and TB1-L1.
2. Check shunt field current. Low shunt
field current causes excessive arma-
ture current. If field current is ad-
equate, check for a mechanical over-
load such as a frozen pump. Also
check for a shorted motor armature.
3. Turn the MAX SPD potentiometer clock-
wise.
4. Turn the CUR LMT potentiometer clock-
wise.
5. Repair or replace controller.
1. Observe line voltage with a voltmeter or
oscilloscope.
2. Check all terminals, connections, and
wiring between the AC line, controller,
and motor.
3. Check motor brushes. Replace if
needed. Repair or replace motor.