Trane CVHE Troubleshooting Manual page 58

Table 7
Motor Winding Resistance
J6 or J8 Connector Pin
(4 to 3)
(4 to 2): WI
(4 to 1)
(3 to 2)
(3 to 1):W2
(2 to 1)
(4 to Conduit)
(3 to Conduit)
(2 to conduit)
(1 to conduit)
7 If the winding resistance is in the range, plug the J connector back into the appropriate
socket.
8 Perform steps 3-7 for each winding of the motor on the Stepper module.
9 If there is a short or an open, you will need to check the wiring to the motor, and then check
the motor.
10 If the windings resistance check passes, and you have not measured the Stepper module
voltages while it is powered, then plug J2 back into the module and go back to Section II,
Quick Test of Stepper Board.
B. If you need to disconnect the wires going to the motor for any reason,
table you can use to reconnect them.
Table 8
Stepper Motor Connections
JB or J8 Connector Pin# on
Stepper
4
3
2
1
CVHE-SB-32A
Acceptable DC Resistance
Range
Open Circuit
50 mOhm to 5 Ohm
Open Circuit
Open Circuit
50 mOhm to 5 Ohm
Open Circuit
Open Circuit
Open Circuit
Open Circuit
Open Circuit
Motor Winding Output Signal
Name
1+
2+
1-
2-
CLV Nominal Resistance
NA
1.68 Ohm
N/A
N/A
1.68 Ohm
N/A
N/A
N/A
N/A
N/A
Table 8
is a wiring
Stepper Motor Terminal
Connection
3
5
1
4
53