Hit Products Logic 3 - Manual (Page 18)

Logic “RAIN OFF” Switch Wiring Instructions
Location:
The rain off terminal is located on the bottom right of the Controller board labeled
“RAIN OFF”. These two terminal screws must be jumped with a wire to close the
circuit and enable normal operation. This jumper wire is factory installed. It is to
be removed if utilizing a “Rain Off” switch.
Function:
This is a normally closed, dry contact circuit. When the circuit is open the unit will
display RAIN and turn off all station output. When the contact is closed the
program will resume running where it would have been at that time during normal
operating mode.
Important Note:
Do not apply live power directly to these contacts.
Tips:
Problem example 1: When using a rain off switch at distances from the controller,
the controller sometimes does not receive the on/off signal from the sensor.
Remedy: A) Relocate the sensor near the controller. B) Use a larger wire size to
eliminate the resistance from the long distance of the run. C) For sensors
requiring an isolation relay, Example: Rain guard type (see drawing). Relocate
the relay to inside the Logic controller cabinet. The sensor itself may be at a
remote location.
Problem example 2:
The LCD display alternates from the normal text to the word RAIN. This is
caused from application of 24VAC to the sensor input. Note: 24VAC will not
permanently damage the sensor, but proper wiring must be completed to restore
normal operation.
Remedy:
This input is a dry contact only. A single wire from one terminal screw to a
normally closed contact with a single return wire to the second terminal is
required. Use care that neither wire is connected to the common or other power
line. When acquiring a relay check the schematic that the actuator/coil is isolated
from the contacts in the output section (no common connections are made
internally). Most solid-state block relays have a Triac connected to the common
internally and are not suitable for this application. Suggested 24VAC relays are:
Omron LY2-AC24, Potter & Brumfield KHAU-17A11-24, NTE /Mauser 526-
R11A10-24. Another source for relays (24VAC Coil, DPDT/SPDT contacts) is
your local Radio Shack store.
P.O. Box 929, 556 S. Mirage Avenue
Lindsay, CA 93247
For Technical Assistance: 800-468-0071 ext. 331
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