24
POWER
120
120
240
240
Orange
Yellow
Power Wiring
Sockets
(120 Vac factory
default)
EMI BOARD
Transformer
Battery
12V 7AH
Battery
12V 7AH
CONTROL BOARD
Incoming Power
HOT
NEUTRAL
GROUND
Black
Green
White
Bridge
Rectifier
J15 Plug
Black
Red
Black
Red
Purple
Gray
Brown
Blue
Black
Red
1
Check the
incoming power.*
Check breaker first, then
check wiring coming
into operator.
The voltage should be
120 Vac or 240 Vac depending
on the application.
Incoming Power
CONTROL BOX
2
Check the AC
power switch.
Is it ON?
3
Check the power
wiring connector.
Is it plugged into the
correct socket?
4
Check the transformer.*
Check the transformer voltage going into
the bridge rectifier (orange and yellow wires).
The reading should be 24 Vac (+/- 10%).
If not, replace the transformer.
*
5
Check the bridge
rectifier.*
Check the voltage coming
out of the bridge rectifer
(red and black wires).The
reading should be 24 Vdc
(+/- 10%).
If not, replace the bridge
rectifier.
7
Check the control
board.
Try replacing the fuse on the
control board. If that does not
work, replace the control board.
6
Check the batteries.*
Check the battery connections. Make
sure two 7AH batteries OR two 33AH
batteries are connected in series.
Check the voltage coming from each
battery by disconnecting the battery
from the operator. A fully charged battery
should read 12.8 to 13.3 Vdc per
battery. If not, replace the batteries.
CONTROL BOARD
TRANSFORMER
BRIDGE RECTIFIER
AC POWER SWITCH
MODEL LA500U
SYMPTOM: Operator does not have power.