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3
Demounting
Section 3.1 - How to demount DRST-UN
First, remember to demount the connectors with hazardous voltages.
Picture 1: Detach the device from the DIN rail by lifting the bottom lock.
When front LED lights red / display shows AO.ER
PR DRST-UN is designed as a SIL 2 device with a high safety level. Therefore, a
continuous measurement of the outgoing current is carried out on a 4...20 mA and
20...4 mA output signal. If the current output signal is different from the internal
calculated output value or the current output is 0 (due to e.g. an open circuit
breakage), an error mode switches on the red front LED.
This function is not a default option but must be actively selected via the
programming menu (S4-20 & S20-4).
The error mode can only be reset by switching off and then switching on the supply
voltage to the device.
8
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