Siemens MICROMASTER 420 - Manual (Page 116)

3 Functions Issue 07/04
MICROMASTER 420 Operating Instructions
116 6SE6400-5AA00-0BP0
OFF2
The inverter pulses are immediately cancelled by the OFF2 command. This means
that the motor coasts-down and it is not possible to brake in a controlled fashion.
t
t
Pulse
cancellation
Operation
act
f
OFF2
P1082
f
max
r0052 Bit02
Fig. 3-45 OFF2
NOTE
The OFF2 command can have one or several sources. The command sources
are defined using BICO parameters P0844 (BI: 1. OFF2) and P0845 (BI: 2.
OFF2).
As a result of the pre-assignment (default setting), the OFF2 command is set to
the BOP. This source is still available even if another command source is
defined (e.g. terminal as command source
→ P0700 = 2 and OFF2 is selected
using DIN2 → P0702 = 3).
OFF3
The braking characteristics of OFF3 are identical with those of OFF1 with the
exception of the autonomous OFF3 ramp-down time P1135. If the output frequency
falls below parameter value P2167 and if the time in P2168 has expired, then the
inverter pulses are cancelled as for the OFF1 command.
t
P2168
t
P2167
Operation
act
f
OFF3
P1082
f
max
r0052 Bit02
P1135
P1082
f
P1135 t
2
3 OFF , down
⋅ =
t
down,OFF3
Pulse
cancellation
Fig. 3-46 OFF3
NOTE
OFF3 can be entered using a wide range of command sources via BICO
parameters P0848 (BI: 1. OFF3) and P0849 (BI: 2. OFF3).