Operation And Wiring; Transformer Assembly - Greenheck vari-green Installation, Operation & Maintenance Manual

Features, Operation,
Wiring and Troubleshooting
Features
Soft start – All motors
feature soft-start
technology which
eliminates inrush
current at start-
up. The motors will
reliably start at any
speed setting.
Overload protection – If the motor becomes
overloaded, it will automatically reduce its speed until it
is no longer overloaded. This means that the motor will
never operate in the "service factor" which is possible
with many AC motors.
Locked rotor protection – If the motor ever encounters
a locked-rotor scenario, the motor will automatically
shut itself down. It will try to restart up to 3 times, and if
after the 3rd time the motor will still not rotate, the motor
will not attempt to start again until power is cycled.
Thermal protection – The motors have a one-shot
fuse thermal protector. This is meant to protect the
motor from a severe temperature rise. With the motor
controller's ability to software limit the speed, the fuse
is used as a last resort to prevent a fire.
RPM measurement – The motors have a small shaft
extension on the end of the motor to measure motor
RPM with either a contact or optical tachometer.

Transformer Assembly

Fig. 1
0-10 VDC External connection with factory mounted transformer
2 Vari-Green Motor

Operation and Wiring

-
Potentiometer Dial Only
Part Numbers Covered in this Section
309028 309029 310108
311353
These motors feature a potentiometer dial on the motor
for speed adjustment. A small screwdriver can be used
to make the speed adjustment. To increase the speed,
rotate the dial clockwise. To decrease the speed, rotate
the dial counter clockwise.
The motor is pre-wired at the factory and cannot be
changed inside the motor. Connect single-phase power
at the voltage listed on the nameplate.
These motors cannot be converted to receive a remote
control signal – a different motor is needed. Please
consult the factory.
Operation and Wiring
-
0-10V Input Only
Part Numbers Covered in this Section
309025 309026 310107
311352
These motors will accept a 0-10 VDC control signal for
speed control. From 0-1.9V, the motor will be off, and
will operate in the 2-10V range. 24 VAC/DC power is
also required for operation. The motor will consume
0.7VA at 24 VAC or 25mA at 24 VDC. A factory mounted
transformer is available to supply this voltage. See Fig. 1
The motor is pre-wired at the factory and cannot be
changed inside the motor. Connect single-phase power
at the voltage listed on the nameplate, along with the
0-10 VDC and 24V signal for speed control.
NOTE: The motor will not operate without the proper
control voltages.
310475 310476
310306 310307
®