Carrier 48GC04 Service And Maintenance Instructions page 8

RPM
Field Accessories:
NOTE: Values in the Field Accessories section are RPM adders.
Fig. 11 — 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 3 for a complete list.
Table 3 — 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
1425 1609
1500
1512 1688
1625
1601 1768
1750
1692 1850
1875
1784 1933
2000
1878 2018
2125
1973 2104
2250
2069 2192
2375
2166 2282
2500
65 65
Economizer
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
1764 1902 2028 2147
1839 1974 2097 2212
1916 2047 2168 2280
1994 2123 2241 2351
2073 2200 2316
2153 2277
2235 2356
2317
65 65 65 65
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.
48GC 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.12 for 3 phase units and see Fig. 13 for 1 phase units.
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.
8
1.4 1.6 1.8 2.0
2260 2367
2322
2387
65 65
Motor Voltage
230
460
575
Min-Max Volts
187-253
360-506
517-633