Leroy Somer's Varmeca inverter drive and motor combination has been
upgraded with the addition of a Profibus interface. The new
fieldbus-capable Varmeca 20 can now be programmed via a PC and networked
for remote control and monitoring, and diagnostic interrogation. As in
the original version, which was launched around five years ago, the speed
of the model 20 can still be varied at the drive via a potentiometer.
Speed ranges are 360-2,400rpm (four-pole) and 720-4,800rpm (two-pole);
four-quadrant operation is provided, with braking resistors enabling
dynamic braking for emergency stops or rapid changes in speed and
direction. Acceleration and deceleration ramps are user-selected and it
is possible to coast or ramp to a stop.