Siemens Vector Control Operating Instructions Manual page 362

Control Word and Status Word
Condition
Result
Bit 1: OFF2 command (L "OFF2") electrical
Condition
Result
Note
Bit 2: OFF3 command (L "OFF3") (fast stop)
Condition
Result
10-2
♦ For PRECHARGING (010), READY (011), RESTART-ON-THE-FLY
(013) or MOT-ID-STANDSTILL (018), the inverter pulses are
inhibited, and the main contactor (option)/bypass contactor, if
available, is opened.
♦ SWITCH-ON INHIBIT (008); compare status word 1, bit 6
♦ READY-TO-POWER-UP (009), if "OFF2" or "OFF3" are not present.
Low signal and P100 = 5 (closed-loop torque control)
♦ An OFF2 command (electrical) is executed.
LOW signal
♦ The inverter pulses are inhibited, and the main contactor
(option)/bypass contactor, if available, are opened.
♦ POWER-ON INHIBIT (008), until the command is removed.
The OFF2 command is simultaneously connected from three sources
(P555, P556 and P557)!
LOW signal
♦ This command has two possible effects:
• DC braking is enabled (P395 = 1):
DC BRAKING (017)
The drive decelerates along the parameterized downramp for
OFF3 (P466) until the frequency for the start of DC braking is
reached (P398).
The inverter pulses are then inhibited for the duration of the de-
energization time (P603).
After this, the drive DC brakes with an adjustable braking current
(P396) for a braking time which can be parameterized (P397).
The inverter pulses are then inhibited and the main contactor
(option)/bypass contactor, if available, is opened.
• DC braking is not enabled (P395 = 0):
The setpoint is inhibited at the ramp-function generator input
(setpoint = 0), so that the drive decelerates along the
parameterized downramp for OFF3 (P466) to the OFF shutdown
frequency (P800).
The inverter pulses are inhibited after the OFF delay time (P801)
has expired, and the main/bypass contactor, if used, is opened. If
the OFF3 command is withdrawn while the drive is decelerating,
the drive still continues to accelerate.
6SE7087-2JD60
Operating Instructions SIMOVERT MASTERDRIVES
05.2006
Siemens AG