Siemens MICROMASTER 420 - Analog Input (ADC); Fig. 3-24 Connection Example for ADC Voltage Input; Fig. 3-25 ADC Channel

3 Functions Issue 07/04
MICROMASTER 420 Operating Instructions
92 6SE6400-5AA00-0BP0
3.6.3 Analog input (ADC)
Number: 1
Parameter range: P0750 – P0762
Function chart number: FP2200
Features:
- cycle time: 4 ms
- resolution: 10 bits
- accuracy: 1 % referred to 10 V / 20 mA
- electrical features: incorrect polarity protection, short-circuit proof
Analog setpoints, actual values and control signals are read-into the drive inverter
using the appropriate analog input and are converted into digital signals / values
using the ADC converter.
The analog input represents a voltage input that can be additionally configured via
parameter P0756.
Depending on the source, the appropriate connection must be made. Using, as an
example, the internal 10 V voltage source, a connection is shown as an example in
the following diagram (refer to Fig. 3-24).
Voltage input
A
D
KL1 10 V
KL2 0 V
KL4 ADC−
KL3 ADC+
> 4.7 kΩ
Fig. 3-24 Connection example for ADC voltage input
The ADC channel has several function units (filter, scaling, dead zone) (refer to
Fig. 3-25).
KL
KL
A
D
ADC
type
ADC
scaling
P0757 P0758 P0759 P0760
ADC
dead
zone
r0755 Pxxxx
r0752
P1000
ADC−
ADC+
r0754
P0761
P0753
P0756
Setpoint
ADC channel
r0722
r0722.3
0
1
1.7 V
3.9 V
Wire
breakage
sensing
P0756 P0761
r0751
F0080
P0704
Pxxxx
Function
Fig. 3-25 ADC channel