Siemens 7SR242 Duobias Commissioning And Maintenance Manual page 55

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Observation

Cannot communicate with the relay.

Relays will not communicate in a ring

network.

Status inputs do not work.

Relay instrument displays show small

currents or voltages even though the

system is dead.

If the above checklist does not help in correcting the problem please contact the local Siemens office or contact

PTD 24hr Customer Support,

Tel: +49 180 5247000,

Fax: +49 180 524 2471,

e-mail: support.energy@siemens.com.

7SR242 Duobias Commissioning & Maintenance Guide

Action

Check that all of the communications settings match those used

by ReyDisp Evolution.

Check that the Tx and Rx fibre-optic cables are connected

correctly. ( Tx –> Rx and Rx –> Tx ).

Check that all cables, modems and fibre-optic cables work

correctly.

Ensure that IEC 60870-5-103 is specified for the connected port

(COM1, COM2, COM3 or COM4).

Check that the Data Echo setting on all relays is set to ON.

Check that all relays are powered up.

Check that all relays have unique addresses.

Check that the correct DC voltage is applied and that the polarity

is correct.

Check that the status input settings such as the pick-up and drop-

off timers and the status inversion function are correctly set.

This is normal. The relay is displaying calculation noise. This will

not affect any accuracy claims for the relay.

Chapter 6 Page 55 of 57

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