6
TROUBLESHOOTING THE ECM MOTOR
EcoBlue™ motors are designed with several built-in protections
included in the motor software. If the motor detects a fault it will
safely shut down. For temperature related faults the motor re
-
quires a line voltage reset to continue operation. For all others,
the motor will resume operation automatically as soon as the
fault condition is cleared. See Table 1 for a complete list.
Table 1 —
Fault Condition/Reset Trigger
Troubleshooting the motor requires a voltmeter.
1. Disconnect main power to the unit.
2. Disconnect motor plug in supply section of the unit.
3. Restore main unit power.
4. Check for proper line voltage at motor power leads Black
(PL1-1), Yellow (PL1-2), and Blue (PL1-3). See the fol
-
lowing table.
5. Check for Control voltage. YEL (PL1-9) to BRN (PL1-7)
should be 10-20Vdc with no commanded speed.
6. Verify the J10 plug at the SystemVu board is wired per
Fig. 8, connected tight, and wires are secured in the plug
7. Disconnect main power.
8. Reconnect motor plug in supply section of unit.
9. Restore main power.
10. Use SystemVu test mode to control the motor. Press the
TEST button. Turn the TEST MODE to on, enter the SER
-
VICE TEST menu, and then enter the FAN TEST menu.
11. Verify with IDF SPEED TEST set to 0% the LED6 on the
board (to the left of the J10 plug) is off. Verify when the
IDF SPEED TEST is set to 10% or higher the LED6 turns
on green.
12. Verify there are no alarms active on SystemVu controller.
13. If all above is verified and the motor does not start and
run, remove the fan assembly and replace the motor with
one having the same part number. Do not substitute with
an alternate design motor as the voltage/speed program
-
ming will not be the same as that on an original factory
motor.
Fig. 8 —
Supply Fan Control Wiring Diagram
Removing the Motor and Fan Assembly
NOTE: Due to press fit design of composite Rotor on Motor, it is
highly recommended that any time a motor is replaced the fan
rotor is replaced as well. The rest of the assembly may be reused.
See Fig. 9.
1. Unplug motor harness from control box harness and cut
wire tie at the fan deck.
2. Unplug connectors from stator temperature limit switch.
3. Remove two screws at front of stator on fan deck.
4. Slide fan assembly forward a couple of inches to clear rear
brackets and lift assembly out.
Fig. 9 —
Fan Assembly Removal
Disassembling Motor and Fan Assembly
See Fig. 10.
1. Remove six screws from retaining rings in the top of the
fan rotor.
2. Remove rotor from motor.
3. Remove four screws connecting motor to stator flange.
4. Remove stator from motor.
5. If required, remove stator limit switch on aluminum stator.
6. Remove three screws from the heat shield. Retain the heat
shield if a new heat shield has not been ordered.
Fault
Condition
Reset
Trigger
Description
Phase Failure
Automatic
One phase is missing or imbalanced. In
this case the motor will come to a stop
and then automatically restart when all
phases are present.
Locked/ Blocked
Rotor
Automatic
The rotor is blocked. Once the locking
mechanism has been removed, the
motor will automatically restart.
Motor Over
Heated
Manual
The motor will stop in the event the
motor over heats. In this case there has
to be a manual restart.
Power Module
Over Heated
Manual
The motor will stop in the event the
electronics over heat. In this case there
has to be a manual restart.
Line under-
voltage
Automatic
Once the line voltage returns within
permitted operating range, the fan will
automatically restart.
Communication
Error
Automatic
Internal communication error of the
fan’s electronics. The fan will restart
automatically, if error is cleared.
48JC Unit Voltage
Motor Voltage
Min-Max Volts
208/230
230
187-253
460
460
414-506
575
575
518-633
4
2
1
3
