Watson-Marlow MM440 - Manual (Page 142)

3 Functions Issue 10/06
MICROMASTER 440 Operating Instructions
142 6SE6400-5AW00-0BP0
3.6.4 Analog outputs (D/A converter)
Number: 2
Parameter range:
r0770 – P0785
Function chart number: FP2300
Features:
- cycle time:
4 ms
- resolution: 10 bit
- accuracy: 1 % referred to 20 mA
Setpoints, actual values and control signals inside the drive inverter are read-out
via the D/A converter using these analog inputs. The digital signal is converted into
an analog signal. All of the signals can be output via the D/A which contain the
"CO" abbreviation in the parameter text (refer to list of all of the BICO parameters
in the parameter list). Parameter P0771 defines, by assigning the parameter
number, the quantity which is output as analog signal through the D/A converter
channel (refer to Fig. 3-34). The smoothed output frequency is output, e.g. via the
analog output, if P0771[0] = 21.
D/A conv.
channel
D
A
KL
KL
D/A conv. −
D/A conv.+ r0755 Pxxxx rxxxx P0771
...
Function
r0020 CO: Freq. setpoint before RFG
r0021 CO: Act. filtered frequency
r0024 CO: Act. filtered output freq.
r0025 CO: Act. filtered output voltage
r0026 CO: Act. filtered DC-link volt.
r0027 CO: Act. filtered output current
r0052 CO/BO: Act. status word 1
r0053 CO/BO: Act. status word 2
r0054 CO/BO: Act. control word 1
...
0
... 20 m
A
Fig. 3-34 Signal output through the D/A converter channel
In order to adapt the signal, the D/A converter channel has several function units
(filter, scaling, dead zone) which can be used to modify the digital signal before
conversion (refer to Fig. 3-35).
Fig. 3-35 D/A converter channel