Siemens 420 manual 111

Issue 07/04 3 Functions

CI: Main setpoint

P1070.C

(755:0)

CI: Main setp scal
P1071.C	r1078
(1:0)

+

AFM

+

BI: Disab.add.setp

P1074.C 0 1

(0:0)

CI: Add. setp.scal

P1076.C

(1:0)

CI: Add. setpoint

P1075.C

(0:0)

Limit

RFG

Motor

control

Fig. 3-40 Summation

MICROMASTER has the following possibilities to select the setpoint source:

1.P1000 – selecting the frequency setpoint source

2.P0719 – selecting the command / setpoint source

3.BICO parameterization

-P1070 CI: Main setpoint

-P1075 CI: Additional setpoint

Further, the main setpoint as well as the supplementary (additional) setpoint can be scaled independently of one another. In this case, for example, a user can simply implement an override function using the appropriate parameterization.

A scan sequence is generally associated with a forwards and a backwards motion. When selecting the reversing functionality, after reaching the end position, a direction of rotation reversal can be initiated in the setpoint channel (refer to Fig.

3-41).

On the other hand, if it is to be prevented that a direction of rotation reversal or a negative frequency setpoint is to be entered via the setpoint channel, then this can be inhibited using BICO parameter P1110.

	r1078	P1113	P1110	P1091 ... P1094	P1080 P1082
		0	0
SUM	-1	1	1	Skip	Limit	RFG
				P1101

Fig. 3-41 Modifying the frequency setpoint

Driven machines can have one or several resonance points in the range from 0 Hz up to the reference frequency. These resonance points result in oscillations which, under worst case conditions, can damage the driven load. Using suppression frequencies, MICROMASTER allows these resonant frequencies to be passed through as quickly as possible. This means that the suppression frequencies increase the availability of the driven load over the long term.

MICROMASTER 420	Operating Instructions
6SE6400-5AA00-0BP0	111