Operation
7.1 ON/OFF Commands
Control Units CU240S
188
Operating Instructions, 07/2008 - FW 3.2, A5E00766042B AD
Quick stop (OFF3)
● Frequency setpoint = 0
● The inverter ramps down to standstill in the period of time set in P1135.
● If parameterized, the motor holding brake is closed, when zero speed is detected. When
the brake application time (P1217) expires, the pulses are suppressed.
Zero speed is detected, if one of the following events occur:
– The actual speed drops below the Switch-off frequency (P2167).
– The monitoring time (P1227), started when the speed setpoint ≤ speed threshold
(P2167), has expired.
● Power-on inhibit is activated.
Before restarting, OFF3 must be confirmed, e. g. via the key FN on the BOP.
CAUTION
If in sensoless vector mode, for example, due to an overload of the motor the inverter
loses orientation. It will not be possible to switch off using an OFF1 or an OFF3
command. In this case it is necessary to initiate an OFF2 command or disable the
pulses using P0054.3.
DANGER
During power off, hazardous loads must be secured by a motor holding brake. To avoid
severe personal injury and property damage, make sure, that a motor holding brake is
established in the drive system. Use SINAMICS G120 brake sequence control (P1215,
P0346, P1216, P1217, P1080) to control the motor holding brake during power off.
