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MX4777 Rev. D ©2021
Table 7. SmartCNX Controller - Troubleshooting
Display
Condition
Description
Alert, Error or Fault
Possible Causes
Solutions
LOW 24VDC
Low 24VDC UPS
Batteries Advisory
only.
Occurs when battery voltage has dropped
to less than 22V. At this level, batteries have
about 20% charge. Normal function until
21V.
●
No AC Power.
●
Wiring / Connector problem
●
Drive module charger failure
●
Power supply failure
1. Verify AC power.
2. Check all connections.
Clean or repair as
required.
3. Check battery
condition and replace
as required.
4. Check charger voltage
is 27VDC at red/blue
battery wires. Replace
drive controller.
5. Verify power supply
voltage of 36VDC and
replace as required.
DEAD BATTERY
Extremely low
UPS batteries – no
automatic operation
- batteries below
21V.
Occurs when battery voltage has dropped
to less than 21V. At this level, batteries have
about 10% charge. Gate will automatically
open or close depending upon setting chosen.
No additional automatic function is possible,
but limited push button control is available
down to 18V.
Refer to solutions above.
HYSECURITY BAD
POWER
Critically low 24V
supply power.
This message can
occur only on initial
start up if power is
critically low.
DC power is below 14V – no control
functions will be allowed at all.
Refer to solutions above.
No display, LED
blinking
SmartCNX
Controller is
receiving power, but
battery voltage is
very low.
Several possible causes:
● AC power has been shut off from the
operator for too long and the batteries
are drained.
●
Wiring problem.
●
Batteries no longer hold a charge.
●
Failed SmartCNX Controller.
●
Failed power supply or drive module.
●
Disconnected com (HSP) wire between
SmartCNX controller and drive module.
Refer to solutions above.
TROUBLESHOOTING/ALERTS/FAULTS/ERRORS