Siemens Robicon Perfect Harmony Drives NXGpro Introductory note 4 V2 - TRIP status
Siemens Robicon Perfect Harmony Drives NXGpro Introductory note 4 V2 - TRIP status
Siemens Robicon Perfect Harmony Drives NXGpro Introductory note 4 V2 - TRIP status
Memorandum
Siemens Industry Automation and Drive Technologies
Sir William Siemens House
Princess Road
Manchester
MU20 2UR Page 1 of 6
Siemens plc Registered office: Faraday House, Sir William Siemens Square, Frimley, Camberley, GU16 8QD. Registered no: 727817, England.
To : UK service engineers
From : R.Harvey
Dates: 2015-06-22
Ref Numbers :
Subject : NGXpro notes, Fourth edition (V2, screen grab for trip message)
THE TRIP ALARM
This note is exclusively about the TRIP alarm, which has already caused a lot of confusion. If the message ‘TRIP alarm’
appears on the keypad, it is nothing to do with a drive trip. It is a fantastically poorly chosen acronym for Tamper
Resistant Input Protection.
Appendix one contains what is known about this from the control manual NXGPRO Control Manual
A5E33474566A_AA.pdf
Basically, a breaker release test has to be performed during commissioning and the drive will not run until it has been
done. Thereafter everything is normal. The setup is called tamper resistant as it cannot be bypassed with wire links.
Note that the control manual says that the test is initiated with parameter function 7126. This is true from the keypad, but
not from Drivetool where the parameter does not appear. From Drivetool the test is initiated from the calibrate menu
Test TRIP response is a new item on the calibrate
menu. Note that it is greyed out here. That is because
the MV was off.
The test is done by manually closing the drive MV breaker and applying MV, then running the test either from the keypad
or tool suite.
After that the drive can be used normally.
THE ICB
The control manual talks about the ICB. I had to ask what this is, as I know that some drives built in the USA have
integrated switchgear for the transformer primary in addition to the customer main breaker. This is nothing to do with
that.
The expression ‘ICB’ is an attempt to standardise the name of the Incoming Circuit Breaker that feeds the transformer.
The customer-supplied, overload protected MV breaker that feeds the drive. (there has in the past been some ambiguity
about names use for this, typically “drive breaker” which can also be used for one of the breakers in sync transfer/bypass).
We have, for many years, provided an MV enable or Breaker enable signal1
intended to be connected to the undervolt
release coil of the ICB to protect the installation from certain faults. But, apparently, some customers in less civilised
parts of the world have used a fused supply and an unprotected contactor, where there is no obvious method of connecting
the drive protection.
1 Two names for the same thing. I begin to see their point.
https://www.robiconperfectharmony.com/
Page 2 of 6
What Pittsburgh have decided for the NGXpro is that
The use of an ICB is now mandatory
The connection of drive protection is now mandatory
The existence of an ICB must be declared in parameter 7127 (Drive Has Input Breaker) The drive won’t run until the ICB release has been tested as described above
ERROR MESSAGES
There are two error messages associated with the T.R.I.P function
Input Breaker Required
This alarm means that parameter 7127 has been set to no but the control thinks the drive should have an ICB. The drive
will not operate like this.
TRIP alarm
The T.R.I.P. test has not been performed on this DCR. The drive will not operate like this. This appears as the word
‘TRIP’ In the keypad status field
M1 RELAY ON SIB
Note that the Latched Fault Relay / MV enable signal is no longer controlled from a predetermined output relay on the
breakout board, but is connected to a dedicated M1 relay on the SIB.
Robert Harvey
Principal Engineer
Page 3 of 6
APPENDIX ONE: DESCRIPTION OF T.R.I.P. FROM THE
CONTROL MANUAL
Tamper Resistant Input Protection
The "Tamper Resistant Input Protection" feature tests the proper functioning of the input circuit breaker (ICB). The ICB
must function correctly or the drive will be inhibited thereby preventing drive operation.
Drives equipped with NXGpro control require an input circuit breaker to protect the drive. Refer to the Operating
Instructions manual supplied with the drive for further information on the coordinated input protection scheme.
Note
Drives produced prior to NXGpro control may not be equipped with an ICB.
The "Tamper Resistant Input Protection" feature requires the completion of a test to verify that the input circuit breaker is
operating correctly and is able to remove medium voltage within a specified timeframe.
● The test must be performed and successfully passed before the drive will be permitted to run. The test must be run once
initially and will rerun automatically any time the system opens the input breaker. The result of the test is stored in
nonvolatile memory in the NXGpro control so that the test need not be performed every time the system is repowered.
● If this test is not performed and successfully passed, the drive will be inhibited and will not be permitted to run.
● This test must be performed and successfully passed if the NXGpro DCR rack is replaced
Menu parameters associated with the "Tamper Resistant Input Protection" feature are as follows:
● Parameter ID 7127 "Drive Has Input Breaker": This parameter indicates that the drive has an input breaker that is under
NXGpro control.
– The default setting is "yes".
– Setting this parameter to "no" for a drive originally equipped with NXGpro control will cause incorrect drive operation.
The "no" option is for retrofit purposes only for systems that are not utilizing an input circuit breaker.
Note
Siemens recommends always using an ICB.
Note
Incorrectly setting this parameter to "no" for drives which require ICB protection will result in an "Input Breaker
Required" fault.
● Parameter ID 7125 "Input Breaker Open Time": This parameter is used to set the maximum expected opening time for
the input breaker when using Tamper Resistant Input Protection.
– The default time is 0.4 seconds.
– The maximum time setting is 0.5 seconds.
● Parameter ID 7126 "Test TRIP Response": This parameter initiates the test of the "Tamper Resistant Input Protection" to
measure the ICB response time. The input breaker will open during the test and removal of medium voltage within the
required time period will be verified.
Refer to Chapter Troubleshooting Faults and Alarms, Section Handling Tamper Resistant Input Protection Related Faults
for fault related information.
The following table provides information for terminal block TB1 connection. Refer to the drive specific wiring diagrams
for TB2 connection points.
Page 4 of 6
APPENDIX TWO: EXTRACT FROM THE FAULT REFERENCE
MANUAL
Taken from the fault reference manual A5E33486417A_AA.pdf
Note that the other message, TRIP alarm, does not appear in the fault reference to date. It appears on the Keypad display
like this:
TRIP status means that the T.R.I.P. test has not been performed.
Page 5 of 6
APPENDIX THREE: WIRING UP THE LFR
There are two methods in use, apparently, for wiring up the LFR. The following diagrams from the provisional notes are,
mysteriously, both attributed to the Gen3e. Field experience suggests the genIV is the same.
The old way: how the LFR was connected up in an NGX2 drive
Note that Nuremberg built drives had a different arrangement, with K41 driving the breaker enable signal
Page 6 of 6
The new way: a dedicated relay on the SIB is used for the MV enable signal.
The signal to flip the LFR is still derived from a User IO, DO-115
The red emendations are mine
Again I expect the German built drives to be different.
SIB
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