Marlo Incorporated MR Series, Installation, Operation And Maintenance Manual, Page: 48 / 52

MR 150M–1050M - PLC CONTROLLER
MAINTENANCE
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PAGE
31
SERVICE CHART STAGER CONTROLLER
SYMPTOM PROBABLE CAUSE HOW TO CORRECT
1. No electrical power. Check circuit. Start a
regeneration with Manual
Regeneration Lever.
2. Frequency levers on Time Dial not
set properly.
Refer to “How to Set
Regeneration Cycle Program
3200 Series Mechanical Timer”.
3. Faulty timer mechanism or
defective timer motor.
Replace.
4. Defective stager drive motor. Replace
Softener does not
regenerate.
5. Defective micro-switch in stager
drive assembly.
Replace drive assembly.
Softener regenerates as
wrong time.
6. Interrupted electrical power. Time
dial set improperly
Reset Time Dial to correct time.
Refer to “How to Set Cycle
Controller”.
7. Stager drive motor burned out. Replace.
8. Loose Electrical connections. Repair.
Position dial does not
rotate.
9. Jammed stager valve. Replace.
10. Controller out of sequence due to:
A. Turning position dial manually
when time switch is not in “OFF”
position or turning the cycle
adjustment knob too quickly for
stager to index.
With time switch mechanism in
normally “OFF” position, (Red
arrowhead pointing straight
down), manually turn Position
Dial clockwise to No. 4 "Service”
position.
B Temporary low voltage condition
of poor electrical connection.
Check circuitry.
C. Jammed Stager. Replace.
D. Defective time switch assembly. Replace.
E. Defective time switch assembly. Replace.
Softener Diaphragm
Valves end regeneration
cycle in wrong position.
F. Defective drive motor. Replace.
Leak to drain from stager
valve during service.
11. Leaky or cut seal in stager valve. Replace.
12. Faulty seal in stager valve. Replace.
13. Clogged stager strainer. Clean strainer.
Hardness Leakage or
Improper cycling or valves.
Individual valves not being
pressurized or vented
correctly.
14. Clogged or kinked stager tubing. Replace tubing or clean.
Page 45
MR 150M–1050M PLC
MAINTENANCE