Ac Motors - Chamberlain LA500U Troubleshooting Manual

To protect against fire and electrocution:
• DISCONNECT power (AC or solar and battery) BEFORE installing or servicing operator.

AC MOTORS

SYMPTOM:
The motor will not run.
CHECK THE MOTOR:
Disconnect ALL power from operator. Disconnect the gate from the operator.
the motor. Refer to illustrations.
Measure resistance between:
RUN 1 = 600 ohms or less
RUN 2 = 600 ohms or less
START = 50k ohms or greater
THERMAL SWITCH = 0 ohms
3
6
9
Unplug motor harness
12
from power board
BEFORE measuring.
SOLUTION:
If the motor measured too much resistance or zero resistance, replace the motor.
BASIC TROUBLESHOOTING
12
Blue
11
Yellow
10
Yellow/Black
9 Orange
8 White
7 Red
6
Purple
5 Gray
4 Yellow/Black
3 Purple
2 Gray
1 Black
2 1
5 4
8 7
11 10
MODELS CSW200U & SL3000
Black
Red
MOTOR
ID
MOTOR RED MOTOR BLUE
J14
J10
MOTOR
CONTROL
CURRENT
SENSOR
J8
Unplug the motor harness from the board and measure the resistance of
Measure resistance between:
15 to 7
14 to 8
12 to 6
11 to 6
9 to 5
Resistance should be
600 ohms or less
There should be continuity
between 1 and 4 (Thermal Switch)
Unplug motor harness
from power board
BEFORE measuring.
Motor shaft should
turn easily.
Measure resistance between:
J7 SWITCH
TRANSFORMER
Red and Black
J5 COMM
J3 120VAC
Black and White
J2 MOTOR
WHITE
J18
Red and White
INPUT
J1
NEUTRAL
OUTLET
J12 WHITE
J6 Resistance should be 600 ohms or less.
BLACK
INPUT
J4
HOT
SWITCH
8
15
Yellow
14 Black
13
Purple
12 Red
11
White
10 Purple
9
Blue
8
Brown
7 Orange
6 Gray
5 Purple
4 Yellow/Black
3 Purple
2 Purple
1 Yellow/Black
3 2 1
4
6 5
9 8 7
10
12 11
15 14 13