LiftMaster SL595 SL595 Manual - Page 26

TROUBLESHOOTING FAULT POSSIBLE CAUSE FIX OPERATOR FAILS TO RUN 1) Improper wired stop control 2) Fault in the operator check the yellow diagnostic LED at the top right of the control board next to the programming dip switches. 3) An accessory is active or malfunctioning check the red input status LEDs, D11-D31 4) Improper J4 connector wiring (master/second) 5) Low or no high voltage power 6) Low or no low voltage power 7) No LEDs illuminated on the control board ➤ Check the green LED (D17) on control board. If the green LED is off, check to make sure a stop control has been installed across terminals TB1-3 and TB1-5 of the terminal strip. ➤ If the yellow LED blinks six times, there is a master/second unit communication failure. If operator is a single unit, make sure there is a jumper across terminals TB1-11 and TB1-12. If operator is in a dual gate configuration, make sure that the communication wiring between the two units is undamaged and complete. ➤ If the yellow light is solid, the board needs to learn the motor. Follow the directions on page 24. ➤ If any red LEDs are on, check the corresponding input. An installed accessory may be wired incorrectly or malfunctioning. Remove the accessory and test the operator. ➤ If the open or interrupt (safety) loop LED is on, make sure factory plug-in loop detectors are working properly and appropriate loops are installed on the loop input terminals. ➤ Stand-Alone Operators: Make sure there is a jumper installed across the J4 connector. ➤ Master/Second Operation: Make sure that the master/second wiring is installed correctly and is intact (not damaged). ➤ Verify power supply to operator. It should be within 5% of the operator's rating when running. Make sure that the proper wire gauge was used for the distance between breaker and operator by consulting the wiring specifications section on page 8 of this manual. ➤ Measure the voltage at terminals R1 and R2 in the operator. This voltage should be within 5% of 24 Vac. If the high voltage power is good and the low voltage power is bad, check to make sure the circuit fuse is not tripped and that the correct primary tap is used on the transformer. If fuse and tap are correct, replace the transformer. ➤ If both primary and secondary power is good, check to make sure that the J2 connector is making good contact with the pins on the control board. If all is good, replace the control board. CONTACTOR CHATTERS WHEN OPERATOR BEGINS TO MOVE 1) Transformer's secondary is overloaded 2) Low primary (high voltage) power ➤ Remove all accessory devices and test the operator. If the contactor stops chattering, find an alternate power source for some of the devices. ➤ Verify power supply to operator. It should be within 5% of the operator's rating when running. Make sure that the proper wire gauge was used for the distance between breaker and operator by consulting the wiring specifications section on page 8 of this manual. OPERATOR RUNS SLOW AND/OR TRIPS THE INTERNAL OVERLOAD 1) Low primary (high voltage) power 2) Problem in the motor 3) Problem in the contactor 4) Problem in the brake system ➤ Measure the incoming line voltage at the unit's on/off switch as well as the meter base or sub panel. Make sure there is not a major change in voltage. The voltage at the operator should be within 5% of the operator's rating when running. ➤ Check the number of amps currently being drawn from the panel. Make sure that the total power being drawn does not exceed the panel's rating. ➤ Make sure that the proper wire gauge was used for the distance between breaker and operator by consulting the wiring specifications section on page 8 of this manual. ➤ Perform a visual inspection of the motor. Examine the motor's labels for any distortion or signs of overheating. Replace the motor if it is humming, grinding or making excessive noise. NOTE: Repeated motor problems indicate poor primary power. ➤ Examine the contactor for sparking, smoke or burn marks. Remove the wires from one side of the contactor, then measure the contact points for high resistance (above 1 ohm). Replace the contactor. ➤ Make sure that the brake is disengaging when the contactor pulls in and engaging when the contactor releases. Replace solenoid. 26