Carrier 40MBFAQ Service Manual page 19

40MBFAQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
Index
1. Indoor or Outdoor DC Fan Motor (control chip is in fan motor)
Power on the unit and when the unit is in the STANDBY mode, measure the voltage of pin1-pin3, pin4-pin3 in the fan motor connector. If the voltage
value is not in the range shown in Table 7, the PCB has malfunctioned and needs to be replaced.
NO.
1
2
3
4
5
6
2. Indoor DC Fan IPM Board (Duct and Ceiling-floor Unit)
PORT
CON1
CN1
CN2
CN23
CON2
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 7 — Signals
COLOR
Red
---
Black
White
Yellow
Blue
DESCRIPTION
Power input for the PCB
Communication with main PCB
Test Port
UVW output for DC fan motor
Ports for reactor
SIGNAL
Vs/Vm
---
GND
Vcc
Vsp
FG
PARAMETER
230V/AC
DC
5V/DC For debugging board
19
VOLTAGE
192V~380V
---
0V
13.5~16.5V
0~6.5V
13.5~16.5V
REMARK