Multifunction Protection and Switchgear Control unit REF542plus
Manual: Motor Protection with ATEX-Certification
The phase currents and phase voltages must be taken as measured input quantities.
All other measured values are quantities derived from them.
Test as follows:
Check whether the set rated values match the rated values required by the user (in
the order documentation).
If necessary, load the application into the PC from the REF542plus.
Select the menu item Main Menu/Settings/Connections/Analog Inputs in
the configuration program. The rated values are shown in the dialog window that ap-
pears and, if necessary, changed.
Test the wiring of the transformers or sensors
Disconnect the transducers or sensors from the REF542plus.
The current transformers must be short-circuited, combination sensors disconnected.
Connect the test set to the REF542plus. The relevant current and voltage signals are
applied to the analog inputs.
Set the required rated values on the test set
Table 7: Rated values of the current and voltage signals
Transducer/sensor Rated value
Current transformer 1A or 5A
Voltage Transformer 100V
Rogowski coil 150 mV
Voltage sensor 2V
To test the phase sequence, set every phase separately to the rated value and then
check the value on the LC display screen. At the end reset the phase to zero.
Generate one symmetrical system each for current and voltage with the rated values.
Check the calculated values. A three-phase current and voltage tester is recom-
mended to test the power. By changing the phase angle between the current and the
voltage system the calculation of reactive and effective values and of cos ϕ can be
checked.
8.7 Testing the protective functions
To ensure that no damage has been caused by transport or setup and installation of
the protection equipment and systems, secondary tests are run on the REF542plus
protection and control unit with the configured protective functions.
Warning!
Always observe the applicable safety regulations when conducting the secon-
dary test with an appropriate test set.
Caution
When testing ensure that the limit values of the measuring inputs and the auxil-
iary voltage supply are not exceeded.
1VTA100114-Rev. 04 en PTMV, 19.01.05 Motorprotection 54 / 66
Valid from Version V4D02
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