10-2014 gForce User Manual ● 123
NOTE:
The plug fan modules are powered by high voltage input line power
(i.e. 208-230V/3PH/50-60HZ or 380-460V/3PH/50-60HZ).
EC motors have built in protective features that include the following:
Over-Temperature protection of the (motor) electronics,
Over-Temperature protection of the motor,
Locked rotor protection,
Phase failure protection,
Under voltage detection,
Short circuit protection.
If any of the conditions exist, the motor stops electronically and an alarm (FAN
FAILURE) will be indicated on the unit’s controller screen.
The motor will not start-up automatically. To reset, the power supply must be switched
to OFF for a minimum of twenty (20) seconds.
If for any reason the rotor is blocked, the motor will electronically switch off. Before
looking for blockage make certain to remove power from the unit. Once the blockage is
cleared the motor will automatically restart when powered on.
If there is an alarm condition indicated as “NO AIRFLOW”, all active functions (cooling,
heating and humidification will stop until the alarm is cleared.
EC motors have an under voltage protection. If the power supply voltage falls below
150 VAC/3Ø (for 208-230 volt motors) 290 VAC/3Ø (for 380-460 motors) for a
minimum of five (5) seconds, the motor will automatically switch off and an alarm
condition (NO
AIRFLOW) will be energized and displayed. If the power supply voltage
returns to the correct values, the motor will automatically restart.
NOTE:
The unit’s control panel (dap4™) has a time delay before the NO
AIRFLOW alarm is energized. It is adjustable from 5 to 180 seconds (in 5
second increments). On site where a voltage problem is known to exist, the
delay can be adjusted to eliminate “nuisance” alarms until the problem is
corrected.
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