Carrier 50FC A04 Series, Service And Maintenance Instructions

Page: 7 / 112

7
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
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.
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.
Field Accessories:
2500
Economizer
ESP in. wg
RPM
Calculator
CFM
0.2
1301
1381
1463
1548
1633
1720
1808
1897
1987
1500
1625
1750
1875
2000
2125
2250
2375
66
80
107
0.4
1477
1544
1615
1688
1764
1842
1921
2003
2068
66
0.6
1639
1699
1763
1828
1897
1967
2040
2115
2191
0.8
1788
1843
1902
1962
2025
2090
2157
2227
2298
66
1.0
1925
1976
2031
2087
2146
2208
2271
2336
66
1.2
2054
2101
2152
2206
2262
2320
2380
66
1.4
2174
2220
2268
2318
2372
66
1.6 1.8 2.0
2289
2332
2378
66 66
80 80 80 80 80 80 80
107 107 107 107 107 107 107
1 Stage E Heat
2 Stage E Heat
UNIT MODEL
NUMBER
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.
50FC Unit Voltage Motor Voltage Min-Max Volts
208/230 230 187-253
460 460 360-506
575 575 517-633