ACTUS 720 Series Grundlegende Einrichtung - Seite 5

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Actuator Trouble Shooting

Remove the screws holding cover and gasket to actuator housing.

Refer to drawing 999-0172 to check wiring

Verify the BLUE wire (terminal block position #3) to negative ground

potential.

Attach the RED wire (terminal block position #4) to negative ground.

Attach the BLACK wire (terminal block position #5) to 12 volts. This

should cause the actuator to extend until contacting the limit switch.

Now reverse the ground and 12 volts on the RED and BLACK wires. This

should cause the actuator to retract until contacting the limit switch. If

actuator operates as described, proceed with the following

potentiometer (pot) check, (where applicable). If the actuator DOES

NOT operate, continue with step #12 under Motor Check.

If the actuator has a 2000 ohm linear pot attached to the P.C. board,

this pot provides a position feedback signal. If the pot is defective, the

actuator may run to either the fully retracted or extended position limit

switch then stop. It is rare that the pot will fail but it can be easily

checked with an ohmmeter.

10. Place the probes of the ohmmeter across the ORANGE and BROWN

wires. A reading of approximately 2000 ohms should be read.

11. Place the probes of the ohmmeter across the ORANGE and YELLOW

wires. Run the actuator back and forth as described earlier. As the

actuator moves from one end to the other, the pot value should move

between zero and 2000 ohms. If the actuator operates as described,

proceed with step #12. If the pot does not operate properly, the P.C.

board assembly can be replaced by ordering Actus part number 024-

0577.

Motor Check

12. Disconnect the RED and BLACK wires from the terminal block positions

#1 and #2 INSIDE the actuator. The motor can now be run directly by

applying 12 volts and ground to those wires.

CAUTION

In this configuration, the actuator limit switches are by-passed.

Be sure that the actuator is always connected to run toward the

furthest limit and power is applied only momentarily.