Siemens 420 manual OFF2

3 Functions Issue 07/04

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.

f act
P1082
fmax	OFF2
r0052 Bit02	t

Operation

Pulse cancellation

t

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.

fact

	P1082
	fmax	OFF3
	P2167
		t
		P2168
r0052 Bit02		tdown,OFF3
		P1135
Operation			= P1135	⋅	f 2
	Pulse	tdown,OFF3
					P1082
cancellation		t
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).

MICROMASTER 420	Operating Instructions
116	6SE6400-5AA00-0BP0