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16.3
AMD limit switch maintenance
16.3.1 Electrical verification
Check that the voltage at the terminals + and - is over 7.5 V when the vane is in the slot.
Connect a multimeter with the scale in DC mA, in series with the terminal +.
Verify that the current is less than 1 mA when the vane is into the slot and more than 3 mA
when the vane is out of the slot.
The verification can be done with the following circuit diagram:
9V battery
(nominal 8.2V
for NAMUR)
Without the sensor, the operation of the amplifier can be checked using the following circuit
diagram:
NAMUR
amplifier
With the potentiometer the current through the NAMUR amplifier can be modified. The
switching point must be between 1.2 mA and 2.1 mA. That is, with the current below 1.2
mA the output relay must have a state and above 2.1 mA the output relay must have the
other state.
16.4
TH6 transmitter maintenance
No special maintenance is required.
20
Potentiometer
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