Bryant 559K 08 Series Service And Maintenance Instructions page 7

Single package rooftop electric cooling unit with puron (r-410a) refrigerant 7.5 to 15 nominal tons
Table of Contents

Advertisement

TROUBLESHOOTING THE ECM MOTOR
Axion™ Fan Technology motors are designed with several built-
in protections included in the motor software. If the motor detects
a fault it will safely shut down. See Table 5, "Supply Fan Motor
Logic and Safety Relays" on page 33 for a complete list.
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.
559K UNIT
MOTOR VOLTAGE
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 9.7 vdc
to 10.3 vdc at IFM-1 and IFM-3 on Unit Control Board
(UCB). See Fig. 11.
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 3.8 vdc and 10.3 vdc.
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
MIN-MAX VOLTS
230
187-253
460
360-506
575
517-633
as the voltage/speed programming will not be the same as
that on an original factory motor.
Fig. 11 — Supply Fan Control Wiring Diagram
7

Advertisement

Table of Contents
loading

This manual is also suitable for:

559k 16 series

Table of Contents