ENVIRO-TEC
35
SECTION 2 - START-UP
FORM ET115.24-NOM4 (819)
2
CHECKING EC WIRE HARNESSES
Use ohmmeter to verify that motor ground wire has
continuity from motor case to ground.
To check signal wire harnesses:
• Remove power from the unit. Unplug signal har-
ness at EC driver and from motor connector at
PWM board.
• Use ohmmeter to check continuity for each con-
ductor, then reconnect harnesses to driver and to
PWM board.
To check power wire harness:
• Refer to wiring diagram.
• Remove power from the unit. Unplug power har-
ness at EC driver.
• Verify green wire has continuity to ground.
• Unplug power wires from connections in electri-
cal enclosure. Verify continuity of wires to motor
driver, then reconnect to same terminals.
Before reconnecting power to unit, verify all harnesses
are connected per diagram.
Use light force when inserting meter
probe into plug. Excess force will damage
contacts.
EC MOTOR AND DRIVER
There are two types of EC motor:
• Constant RPM EC motor, both single and double
shaft.
•
Constant Airflow or Constant Torque EC motor,
both single and double shaft.
Constant Airflow/Constant Torque EC Motors
FIGURE 24 -
CONSTANT CFM/CONSTANT
TORQUE EC MOTORS (1/3 HP SHOWN)
FIGURE 25 -
CONSTANT CFM/CONSTANT
TORQUE EC MOTOR DRIVER
LD19307
LD19309
Summary of Contents for VHA
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