8.9 Course of a Regulated Two Speed Travel
(Summary)
After switching on the main contactor and releasing the inverter, the
control unit selects the inverter by setting the direction of travel,
speed V3 and the starting signal. The inverter keeps the motor at
idling speed of n=0 revolutions per minute and sends signal MB to
the control unit (1 to 2) via terminal 31, which opens the electromag-
netic brake. After switching on the brake via relay K4 of the control
unit, the motor accelerates until speed V3 is reached (2 to 3). A travel
at constant speed follows (3 to 4) until speed V3=0 is cancelled. The
motor slows down to positioning speed V1 (4 to 5). After a short dis-
tance, speed V1=0 is no longer selected (5 to 6), and the motor
decelerates further (6 to 7). As soon as the motor stands still, the
inverter closes the electro-magnetic brake MB (7 to 8). The main con-
tactors are switched off with a time delay through the RF signal.
94 Installation Manual System »bp308« – Commissioning Instructions
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