X hits on this document





14 / 24


Electromechanical Controllers

Time and/or day incorrect - As long as an electromechanical controller is connected to its primary power source the correct time and day can be determined upon visual inspection. If this is not the case, check the following:

Primary power - Verify that the 117 volt VAC power is on and correctly connected to the controller. The acceptable range is between 105 and 129 VAC. If the voltage is above or below this range, contact a certified electrician.

Transformer - The transformer output should be between 24 and 28 VAC. If the primary power is correct, then the transformer should be replaced. This is not a Rain Bird warranty item, as this is usually caused by incorrect fuse sizing.

Circuit breaker/fuse - Check the condition of the circuit breaker or fuse, if it has been blown the most likely reason is a field wiring short. An Electromechanical controller will stop on the station that caused the problem. Reset the controller to its rest position and replace the fuse or reset the circuit breaker. Manually advance the controller to station #1 and allow it to run for one minute. If station #1 operates correctly then advance to station #2 and repeat this procedure until the fuse blows. This will determine the problem station. Once the defective station has been located, disconnect the wire that operates that valve. Continue the above procedure to test the rest of the stations as there could be more than one problem. Once this has been completed the controller will operate all of the stations that are still connected. The faulty field wiring will have to be repaired before they can be reconnected to the controller. Refer to the VOM section for field wire testing.

Clock motor - In order for the controller to maintain the proper time and day, the clock motor (sometimes referred to as the timing motor) must constantly operate. Because of this the clock motor will tend to fail before any of the others. Verify the motor is receiving the proper voltage, set the hour dial to the correct time, and wait for approximately one hour. If the hour dial has not moved then replace the motor.

Gears and clutches - (Note: Some controllers are direct drive and have no gears. The gear referred in this section relate to the RC-4, 7, 1230, and 1260 series only.) The gears transfer the rotation of the clock motor to the hour dial and station timing. Try to turn the station dial and hour dial in the opposite direction of the arrows shown on the face plate.

Do not exert excessive force when performing this test. If the dials will turn backwards then the clutch is stripped and the gears will need to be replaced. Inspect the gears for missing or worn teeth; also, inspect the hub where the metal shaft inserts through the gear for cracking. It is recommended that if either the station dial shaft assembly or the pilot shaft assembly needs replacement, both assemblies should be replaced as a set.


Document info
Document views71
Page views71
Page last viewedMon Jan 16 18:53:31 UTC 2017