Figure 17 - Typical Spring Latches
Electronically Commutated (EC) Motors (EC Motors)
Units with Electronically Commutated (EC) motors “plug fans” are standard on all floor mount gPod units.
NOTICE The plug fan modules are powered by high voltage input line power (i.e.
208-230-460V/3PH/60HZ) and speed is set from 0-10V DC control signal from
the unit’s dap4 or Mini-dap4.
Fan speed is factory set based on airflow and static requirements when an order is placed.
Fan speed can be changed in 1% increments via the Mini-dap4 or dap4 controller. See the Mini-dap4 or dap4 User
Manual (Menu J Factory Settings) for details and recommended settings.
7.4.1 EC Plug Fan Manual Test (Units with a dap4 Controller Only)
To manually test the EC plug fans, turn ON the Blower slide switch and the Fan Speed slide switch on the Manual
Override Switch Board. This will enable a temporary analog fan control signal to the maximum value which is preset
at the factory. The plug fan(s) will rotate near full speed. After the test is complete, turn OFF the Fan Speed and
Blower slide switches.
7.4.2 Protective Features
EC motors have built-in protective features that include:
- Over-temperature protection of the (motor) electronics
- Over-temperature protection of the motor
- Locked rotor protection
- Phase failure detection
- Under-voltage detection
- Short-circuit protection
If any of the conditions exist, the EC motor stops automatically, and a NO AIRFLOW alarm will be energized and
displayed on the unit display. To reset, the power source must be switched OFF for a minimum of 3 minutes. The
motor will start automatically when the power is restored. If these alarms continue, there is probably an internal
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