Troubleshooting The Ecm Motor; Fault Condition/Reset Trigger - Carrier 50FC Series Service And Maintenance Instructions

RPM
Field Accessories:
1 Stage E Heat
2 Stage E Heat
NOTE: Values in the Field Accessories section are VDC adders.
Fig. 9 — Example of Fan Speed Set Up Labels for SystemVu™ Controls

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 2 for a complete list.
Table 2 — Fault Condition/Reset Trigger
Fault Reset
Condition Trigger
Phase Failure Automatic
Locked/ Blocked
Automatic
Rotor
Motor Over
Manual
Heated
Power Module
Manual
Over Heated
Line under-
Automatic
voltage
Communication
Automatic
Error
Calculator
0.2 0.4
1301 1477 1639
1500
1381 1544 1699
1625
1463 1615 1763
1750
1548 1688 1828
1875
1633 1764 1897
2000
1720 1842 1967
2125
1808 1921 2040
2250
1897 2003 2115
2375
1987 2068 2191
2500
66 66
Economizer
80 80
107 107 107
Description
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.
The rotor is blocked. Once the locking
mechanism has been removed, the
motor will automatically restart.
The motor will stop in the event the
motor over heats. In this case there has
to be a manual restart.
The motor will stop in the event the
electronics over heat. In this case there
has to be a manual restart.
Once the line voltage returns within
permitted operating range, the fan will
automatically restart.
Internal communication error of the
fan's electronics. The fan will restart
automatically, if error is cleared.
ESP in. wg
0.6 0.8 1.0 1.2
1788 1925 2054
1843 1976 2101
1902 2031 2152
1962 2087 2206
2025 2146 2262
2090 2208 2320
2157 2271 2380
2227 2336
2298
66 66 66 66
80 80 80 80
107 107 107
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). Blue is only
present on 3-phase motors. See the following table.
50FC Unit Voltage
208/230
460
575
5. Disconnect main power.
6. Reconnect motor plug in supply section of unit.
7. Restore main power.
8. Check for proper motor control voltage signal of 9.7Vdc
to 10.3Vdc at IFM-1 and IFM-3 on Unit Control Board
(UCB). See Fig. 10.
9. Using a jumper wire from unit control terminals R to G,
engage motor operation.
10. Verify control signal from user speed selection switch by
placing voltmeter taps in provided terminals marked Vdc.
Signal should be between 3.8Vdc and 10.3Vdc.
11. If the motor does not start and run, remove the fan assem-
bly and replace the motor with one having the same part
number. Do not substitute with an alternate design motor
as the voltage/speed programming will not be the same as
that on an original factory motor.
7
1.4 1.6 1.8 2.0
2174 2289
2220 2332
2268 2378
2318
2372
66 66
80 80
107 107
Motor Voltage
230
460
575
Min-Max Volts
187-253
360-506
517-633