7SR105 Rho Commissioning and Maintenance Guide
©2018 Siemens Protection Devices Chapter 6 Page 3 of 4
Section 1: Commissioning and Maintenance Guide
1.1 Troubleshooting
This section provides the common problems and the recommended solution to resolve the problem.
Observation Action
Check the correct auxiliary AC or DC voltage is applied and the polarity is
correct.
Relay won’t accept the
password
The password entered is wrong. Enter the correct password.
If correct password has been forgotten, note down the numeric code displayed at
the Change Password screen e.g. Change password = 1234567
To retrieve the password, communicate this numeric code to a Siemens Limited
representative.
Protection Healthy LED
flashes
General failure. Contact a Siemens Limited representative.
LCD screen flashes
continuously
The LCD displays multiple error messages by flashing continuously. These
indicate the various processor card faults.
General failure. Contact a Siemens Limited representative.
Relay displays one
instrument after another
with no user
intervention
This is normal operation, the default instruments are enabled.
Remove all instruments from the default list and add only the instruments that are
required.
Cannot communicate
with the relay
•
Check that all the communications settings matches with the settings used by
Reydisp Evolution.
• Check that all cables, modems, and fibre-optic cables work correctly.
• Ensure that IEC 60870-5-103 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.
Status inputs do not
work
• 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.
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.
Temperature input
meter displays the open
Check the wiring of temperature inputs as per the connection diagram.
inputs are
displaying OPEN
and SHORT
indication in the
Instrument mode
• When the Temperature inputs is in OPEN:
1. Check the terminal.
2. In the Temperature inputs, none of the terminal should not be open at both
ends (Relay and Temperature sensor side)
• When the Temperature inputs is in SHORT:
1. Check the rear terminal connection.
2. Connect the terminals as shown in the 7SR105 Rho Technical Manual,
Chapter 5.
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