4
ELECTRICAL CONNECTIONS
28
H250 M40
www.krohne.com
03/2020 - 4000640706 - MA H250-M40 R06 en
After the setting:
•
Pull the upper scale support 2 mm / 0.08" flexibly upwards and pull out the scale again from
its locking point to the side.
•
Tighten the locking screw
3
with max. 0.2 Nm.
•
Slide in the scale up to the locking point.
Definition of switch contact
If the pointer vane goes into the slot, an alarm is triggered.
If the pointer vane is outside of the proximity switch, a wire break in a NAMUR contact also
triggers the alarm.
The 3-wire limit switch does not have any wire break detection.
CAUTION!
If the maximum torque (0.2 Nm) is exceeded, the locking screw can be torn off during tightening!
Figure 4-4: Definition of switch contact
1
MIN contact
2
MAX contact
3
Pointer vane with switching vane
Figure 4-5: Definition MIN-MIN - MAX-MAX
1
MIN 2 contact or MAX 1 contact
2
MIN 1 contact or MAX 2 contact
Contact
Type
Current consumption
MIN 1
NAMUR
≤
1 mA
MIN 2
NAMUR
≤
1 mA
MAX 1
NAMUR
≥
3 mA
MAX 2
NAMUR
≥
3 mA
Table 4-2: Current consumption in the position shown:
