Short-Circuit Monitoring Of The Thermistor Circuit - Eaton EMT6-K Handbuch

1 EMT6 Thermistor Overload Relays for Machine Protection
1.3 Description of device

1.3.6 Short-circuit monitoring of the thermistor circuit

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The sensor circuits of all EMT6 units are equipped with a wire-break (open-
circuit) safety sensor circuit. The sensor circuits of the EMT6-K, EMT6-KDB
and EMT6-DBK have additional short-circuit monitoring in the sensor circuit
which immediately switches off the relay when the resistive load of the
sensor circuit drops below a minimum value.
￫
The short-circuit monitoring of the EMT6-DBK device can be
disabled by means of a wire jumper between terminals Y1-Y3
(￫ Figure 6, page 49).
DANGER

Short-circuit monitoring is essential in the sensor circuit to
monitor Ex e motors. Short-circuit monitoring may not be
disabled.
EMT6, EMT62, EMT6-DB, and EMT62-DB devices without short-circuit
monitoring in the thermistor circuit are not approved for use in Ex e
applications!
NOTICE
The maximum short-circuit current of the thermistor input is
1.9 mA.
EMT6 10/16 MN03407006Z-DE/EN www.eaton.com