Repair
312063Z 31
Motor Control Board
NOTE: Motor control board has one red LED (D11).
Power must be on to check. See F
IG. 5 for location.
Function is:
• Startup: 1 blink for 60 Hz, 2 blinks for 50 Hz.
• Motor running: LED on.
• Motor not running: LED off.
• Diagnostic code (motor not running): LED blinks
diagnostic code, pauses, then repeats (for example,
E21=21 blinks, pause, 21 blinks).
1. Turn main power OFF . Disconnect power
supply.
2. Relieve the pressure. See Pressure Relief
Procedure, page 26.
3. Refer to electrical diagrams. Motor control board is
on right side inside cabinet.
4. Put on static conductive wrist strap.
5. Disconnect all cables and connectors from board.
6. Remove nuts (40) and take entire motor control
assembly to workbench.
7. Remove screws and take board off heatsink.
8. Set DIP switch (SW2) on new board. See T
ABLE 4
for factory settings. See F
IG. 5 for location on board.
9. Install new board in reverse order. Apply thermal
heatsink compound to mating surfaces of board and
heatsink.
NOTE: Order Part 110009 Thermal Compound.
NOTICE
Before handling board, put on a static conductive
wrist strap to protect against static discharge which
can damage board. Follow instructions provided
with wrist strap.
To prevent overpressurization, DIP switch 2 must be
set to ON for Model H-25.
Table 4: DIP Switch (SW2) Settings
DIP
Switch ON (up) OFF (down)
Switch 1 Motor soft start ON
(factory default)
Motor soft start
OFF
(Not applicable to
3-phase motors)
Switch 2 ON for pressure
imbalance alarm
(factory default)
OFF for pressure
imbalance warning
Switch 3 Standby ON Standby OFF
(factory default)
Switch 4 ON for Models H-25
and H-40
(system dependent)
OFF for Models
H-XP2 and H-XP3
(system
dependent)
Table 5: Motor Control Board Connectors
Connector Pin Description
J1 n/a Main power
J3 n/a Transducer A
J4 n/a Not used
J7 n/a Not used
J8 n/a Transducer B
J9 n/a Motor thermostat (NC)
J10 n/a Not used
J12 n/a Data reporting
J13 n/a To display board
J14 n/a Motor power
J18 1 Directional valve, A+
2 Directional valve, A-
3 Directional valve, B+
4 Directional valve, B-
5GND
J5 1 Unused (VDD)
2 Pumpline reversing switch
(COM)
3 Pumpline reversing switch
(NC)
4 Pumpline reversing switch
(NO)
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