The Controller phase proportions (modulates) the single phase power to regulate RPM as determined by a 2–10VDC or 4–20mA DC input signal provided by the customer.
The optional 266 PI Interface can
also be used to provide a desired setpoint of operation and drive the
control as needed.
The 709-VmA Series Controller provides independent “maximum” and “minimum” speed limit adjustments. Also included, a separate continuous minimum speed or “drop out” function at minimum input.
The variable speed Controller is
used for adjustment of motor RPM within a limited range of operating temperatures that assure adequate ventilation of the motor. The Controller is designed for air moving applications using squirrel cage or propeller type fans.
It may be suitable for other, non air-moving, direct drive motor applications. Motors should be open, drip-proof types.