P54x/EN GS/La4 Getting Started
(GS) 3-6
MiCOM P543, P544, P545 & P546
GS
Figure 2 P543 relay rear view (60TE)
Note: Above diagram indicates example P543 60TE case layout for
information purposes, exact layout will vary depending on model
configuration and case size.
Refer to the wiring diagram in chapter P54x/EN IN for complete connection details.
1.3 Relay connection and power-up
Before po
wering-up the relay, confirm that the relay power supply voltage and nominal ac
signal magnitudes are appropriate for your application. The relay serial number, and the
relay’s current and voltage rating, power rating information can be viewed under the top
hinged cover. The relay is available in the following auxiliary voltage versions and these are
specified in the table below.
Nominal ranges
Operative dc
range
Operative ac
range
24 - 48 V dc 19 to 65 V -
48 - 110 V dc (40 - 100 V ac rms) ** 37 to 150 V 32 to 110 V
110 - 250 V dc (100 - 240 V ac rms) ** 87 to 300 V 80 to 265 V
** rated for ac or dc operation
Note: The label does not specify the logic input ratings.
The P54x relay is fitted with universal opto isolated logic inputs that can be programmed for
the nominal battery voltage of the circuit of which they are a part. See ‘Universal Opto input’
in the Firmware chapter for more information on logic input specifications.
Note: The opto inputs have a maximum input voltage rating of 300 V dc at
any setting.
Once the ratings have been verified for the application, connect external power capable of
delivering the power requirements specified on the label to perform the relay familiarization
procedures. Figure 2 indicates the location of the power sup
ply terminals but please refer to
the wiring diagrams in the Installation section for complete installation details ensuring that
the correct polarities are observed in the case of dc supply.
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