Ec Motor Testing - Data Aire gForce Ultra Installation, Operation & Maintenance Manual

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
230-volt motors) 290 VAC/3Ø (for 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.

EC Motor Testing

To test the plenum fan modules in manual mode, wire a 9-volt battery across the plug fan control signal
(see schematic for wiring details). Be certain to disconnect both terminals (+ and -) from the analog
output. This will enable the fan control signal at approximately 90%. The fans will spin at near full speed
if the contactors are enabled.
WARNING: The plug fan modules are powered by high voltage input line
power (i.e. 208-230V/3PH/60HZ or 460V/3PH/60HZ). Do not carry out
any work on electrically live parts. Even after disconnection, the de-link
circuit is still live. Always wait at least 3 minutes.
NOTICE: 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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gForce Ultra IOM