LiftMaster HCTDCU HCTDCU Installation Manual - Page 40

Switch SW Accessory

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TROUBLESHOOTING TROUBLESHOOTING CHART continued... SYMPTOM Switched (SW) Accessory power remaining on POSSIBLE CAUSES a) In limit setup mode Accessories connected to a) Normal behavior Switch (SW) Accessory power not working correctly, turning off, or resetting Accessories connected to Accessory power not working correctly, turning off, or resetting a) Accessory power protector active b) Defective control board Quick Close not working correctly a) Quick Close setting incorrect b) Interrupt loop detector c) Defective Expansion board Anti-Tailgating not working correctly a) Anti-Tail setting incorrect b) Interrupt loop detector c) Defective Expansion board AUX Relay not working correctly a) AUX Relay setting incorrect b) AUX Relay wiring incorrect c) Defective Expansion board SOLUTIONS a) Learn the limits. a) Move accessory to accessory power "ON". a) Disconnect all accessory powered devices and measure accessory power voltage (should be 23 - 30 Vdc). If voltage is correct, connect accessories one at a time, measuring accessory voltage after every new connection. b) Replace defective control board. a) Check that Quick Close setting is ON. b) Check operation of Interrupt Loop detector. c) Replace defective Expansion board. a) Check that Anti-Tail setting is ON. b) Check operation of Interrupt Loop detector. c) Replace defective Expansion board. a) Check AUX Relay switches settings. b) Check that wiring is connected to either N.O. and COM or to N.C. and COM. c) Set AUX Relay to another setting and test. Replace defective expansion board. 40

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40
SYMPTOM
POSSIBLE CAUSES
SOLUTIONS
Switched (SW) Accessory
power remaining on
a)
In limit setup mode
a) Learn the limits.
Accessories connected to
Switch (SW) Accessory
power not working correctly,
turning off, or resetting
a)
Normal behavior
a) Move accessory to accessory power "ON".
Accessories connected to
Accessory power not
working correctly, turning
off, or resetting
a) Accessory power protector active
b) Defective control board
a)
Disconnect all accessory powered devices and measure accessory
power voltage (should be 23 – 30 Vdc). If voltage is correct, connect
accessories one at a time, measuring accessory voltage after every
new connection.
b) Replace defective control board.
Quick Close not working
correctly
a) Quick Close setting incorrect
b)
Interrupt loop detector
c) Defective Expansion board
a) Check that Quick Close setting is ON.
b) Check operation of Interrupt Loop detector.
c) Replace defective Expansion board.
Anti-Tailgating not working
correctly
a) Anti-Tail setting incorrect
b)
Interrupt loop detector
c) Defective Expansion board
a) Check that Anti-Tail setting is ON.
b) Check operation of Interrupt Loop detector.
c) Replace defective Expansion board.
AUX Relay not working
correctly
a) AUX Relay setting incorrect
b) AUX Relay wiring incorrect
c) Defective Expansion board
a) Check AUX Relay switches settings.
b)
Check that wiring is connected to either N.O. and COM or to N.C.
and COM.
c)
Set AUX Relay to another setting and test. Replace defective
expansion board.
TROUBLESHOOTING
TROUBLESHOOTING CHART continued...