7SR157 Technical Manual
©2016 Siemens Protection Devices Limited
Chapter 6 - Page 14 of 14
4.3
Troubleshooting
Observation
Action
Relay does not power up.
Check that the correct auxiliary AC or DC voltage is applied and
that the polarity is correct.
Relay won’t accept the password.
The Password being entered is wrong. Enter correct password.
If correct password has been forgotten, note down the Numeric
Code which is displayed at the Change Password screen e.g.
To retrieve the password, communicate this code to a Siemens
Protection Devices Ltd. representative.
Protection Healthy LED flashes
General failure. Contact a Siemens Protection Devices Ltd.
representative.
LCD screen flashes continuously.
The LCD has many possible error messages which when
displayed will flash continuously. These indicate various processor
card faults.
General failure. Contact a Siemens Protection Devices Ltd.
representative.
Backlight is on but no text can be seen.
Adjust the contrast.
Scrolling text messages are unreadable.
Adjust the contrast.
Relay displays one instrument after
another with no user intervention.
This is normal operation, default instruments are enabled.
Remove all instruments from the default list and only add those
that are required.
(See Section 2: Settings and Instruments of this manual).
Cannot communicate with the relay.
Check that all of the communications settings match those used
by Reydisp Evolution.
Check that all cables, modems and fibre-optic cables work
correctly.
Ensure that IEC60870-5-103 is specified for the connected port
(COM1 or COM2).
Relays will not communicate in a ring
network.
Check that all relays are powered up.
Check that all relays have unique addresses.
Binary Inputs do not work.
Check that the correct DC voltage is applied and that the polarity
is correct.
Check that the Binary Input settings such as the pick-up and drop-
off delays and the Inverted Input function are correctly set.
Relay instrument displays show small
currents or voltages even though the
system is dead.
This is normal. The relay is displaying calculation noise. This will
not affect any accuracy claims for the relay.
If the above checklist does not help in correcting the problem please contact the local Siemens office or contact PTD 24hr
Customer Support: Tel: +49 180 524 7000. Fax: +49 180 524 2471 or email: [email protected].
Active G1
----------------------------------------
Setting Password
Code = 340701675
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