6
Commissioning
6.1
Commissioning the device
1.
Check that the connectors have been connected correctly:
grams, pin assignment", page 21
.
2.
Select a suitable fuse:
see "Select a suitable fuse", page 23
.
3.
Set up the filter wiring:
see "Set up the filter wiring", page 23
.
4.
Put the device into operation.
5.
Check the sensor function:
see "Checking the device function", page 27
.
6.2
Select a suitable fuse
When selecting a suitable fuse, the transient peak current when switching on the
device for the time must be taken into consideration:
Table 10: Inrush current when switching the device on
Inrush current for an supply voltage of 12 VDC 2.5 A / 50 μsec typical
Inrush current for an supply voltage of 24 VDC 5.0 A / 50 μsec typical
6.3
Set up the filter wiring
Thermal noise, for example from resistors, becomes evident when the signal output is
amplified sufficiently. The supply voltage ripple (
other sources of interference, e.g., electromagnetic interference, can also affect the
quality of the analog output signal. To reduce the noise when acquiring analog meas‐
urement data, it is essential to use a filter.
A suitable filter, for example, is a combination of R1 = 50 Ω and C1 = 100nF bis 1µF.
This will keep the signal delay time within the cycle time (internal measurement fre‐
quency) while not changing the dynamic behavior significantly.
SIG
+
GND
GND
GND
GND
R1
50R
C
1
Controller
Input
A/D converter
e.g., 12 bit →
4,096 steps
SIG
Figure 18: Filter wiring
NOTICE
The A/D converter at the input of the installed electrical controller will determine the
resolution of the sensor, e.g.,:
•
8 bit = 256 steps
•
10 bit = 1,024 steps
•
12 bit = 4,096 steps
Signal output when switching on the device
When switching on the device, the signal output is ≥ F.S.O = Full Scale Output. After that
the device is ready for use.
COMMISSIONING
6
8021473/2017-08-08 | SICK
T E C H N I C A L I N F O R M A T I O N | MAX48
23
Subject to change without notice
