Presto Lifts PLS53-150P Installation, Operation And Service Manual page 13

Lifter Does Not Go Up or Down
Take off the load of the platform. Press the ON button. Connect charger and
press the H-Commander (or the activator 13). If it starts to work a little bit in
both directions, it is most likely the fuse has broken or the batteries are worn
down. Replace fuse located behind the white distance block. Check batteries
and replace if needed. If the test with charger is successful, the charger is work-
ing properly. See below for a full test of the charger.
UP or DOWN Function Doesn't Work
If UP doesn't work it is most likely a failure at the contact arm of the top limit switch (22) or the UP-switch (26).
Down switch is pos 11. Take off the front cover and put a wire across the top limit switch connections. Press UP
button and if it works you can replace the top limit switch using a hexagon key 2,5mm. Make sure the wires are
connected to the NC pins 1 & 4. Contact arm with roller shall be mounted in the middle position.
Testing Relay and Motor
Measure 24V DC on + / -. If voltage is between 24V and 26V
the batteries are okay. Measure if you have the same voltage on
F. (Your black measuring pin must be on minus -). If the micro
switches are okay you can use the H-commander to activate the
relay.
You should hear the clicking from relay in both directions.
If the relay clicks but the motor does not move please check
connection to the motor. Measure on M1 and M2 and you shall
read 24V DC changing direction when you press the up or down button. If you have the changing 24 V DC it is
most likely the motor or the wires to the motor are broken.
PRESTO OWNER'S MANUAL Page 14 LIFT STIK