4
LOW VOLTAGE OUTPUT OVERLOAD PROTECTION
The BZ-2xx contains built-in short circuit and thermal protection circuitry that shuts down the +24 VDC output (low voltage red wire)
to prevent permanent damage to the power pack. Removing the excess load from the output restores the BZ-2xx to proper operation.
Connect the excess load to another power pack.
Output is current limited. As the load increases, the BZ output will reach its model-specific maximum output current. Under these
conditions, the output voltage may appear less then the nominal 24-V output and the BZ will indicate the overload conditions with a
continuously blinking LED (as described in the LED Indicator section). In extreme cases, such as a dead short, the output voltage will
appear near zero but will automatically return to normal operating conditions once the excess load is removed.
LED INDICATOR
The LED on the left side of the BZ-2xx indicates the following conditions:
• LED OFF
: no power to the BZ-2xx, or the +24VDC output is shorted.
• LED blinking continuously
: current output limit is exceeded (too many sensors are connected to the power pack); +24VDC output
shut down.
• LED ON, blinks once every 3 seconds: the relay is open (load OFF).
• LED ON continuously
: the relay is closed (load ON).
TROUBLESHOOTING
The lights came ON automatically after I deliberately turned them OFF for a presentation.
• The BZ-2xx is set for the Auto ON Mode and the occupancy sensor time delay expired. The BZ-2xx reverted to Auto ON and then
motion was detected.
▸
Consider increasing occupancy sensor sensitivity and/or time delay.
▸
Generate more motion during presentations.
The load does not turn ON with occupancy detection.
• Mode Switch is set to Manual ON.
• Hold OFF input is active.
The load does not turn OFF after sensor time delay expires.
• Hold ON input is active.
• Check sensitivity on the occupancy sensor.
• Verify that the time amount is the intended amount.
• Verify that the sensor is not being retriggered by unintentional movement or byplacement too close to a an air vent.
The load does not respond when I press the momentary switch.
• Check wiring.
The load does not come on automatically although the Mode Switch is set to Auto ON.
• Cycle power to the unit to reset operating mode to Auto ON. Mode Switch location was changed while the power pack was powered
(line voltage).
The load comes on automatically with occupancy although the Mode Switch is set to Manual ON.
• Cycle power to the unit to reset operating mode to Manual ON. Mode Switch location was changed while the power pack was
powered (line voltage).
No LED activity as described above.
• Check for excessive load.
• Check AC power.
