Changing the
Negation
parameter is not recommended
without special skills.
•
Change the parameter in PCM600, see PCM600 documentation.
•
Check the actual state of the connected binary inputs.
•
In LHMI, select
Main menu/Test/Binary input values
. Then navigate
to the board with the actual binary input to be checked.
•
Check the actual state of the connected binary inputs through PCM600,
see PCM600 documentation.
•
Measure output contacts using the voltage drop method of applying at least the
minimum contact load given for the output relays in the technical data, for
example 100 mA at 24 V AC/DC.
Output relays, especially power output relays, are designed for
breaking high currents. Due to this, layers of high resistance
may appear on the surface of the contacts. Do not determine
proper functionality of connectivity or contact resistance by
measuring with a regular hand-held ohm meter.
A
1
2
3
4
V
GUID-BBAEAF55-8D01-4711-A71D-BBC76B60BA3D V1 EN-US
Figure 51:
Testing output contacts using the voltage drop method
1 Contact current
2 Contact voltage drop
3 Load
4 Supply voltage
•
To check the status of the output circuits driving the output relay via the
LHMI, select
Main menu/Test/Binary output values
and then navigate to the
board with the actual binary output to be checked.
•
Test and change the relay state manually.
Section 8
1MRK 500 128-UEN B
Troubleshooting
82
650 series 2.2 IEC
Operation manual
