sepam 20 user manual - Schneider Electric

7
Commissioning Checking phase current
input connections
LPCT type current sensors
Description
Check to be performed for Sepam S20, S23, T20, T23
or M20, when phase currents are measured by
LPCT-type current sensors.
Phase current measurement by LPCT
sensors
b The 3 LPCT current sensors are connected via an
RJ45 plug to the CCA670 connector which is to be
mounted on the rear panel of Sepam, identified as
b The connection of only one or two LPCT sensors is
not allowed and causes Sepam to go into the fail-safe
position
b The primary rated current In measured by the LPCT
sensors is to be entered as a Sepam general setting
and configured by microswitches on the CCA670
connector.
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B
DE80136
Procedure
The tests to be carried out to check phase current input connections are the
same whether the phase currents are measured by CTs or by LPCT sensors.
Only the Sepam current input connection procedure and current injection
values change.
To test current inputs connected to LPCT sensors with a standard injection box, the
ACE917 injection adapter is required.
The ACE917 adapter is inserted between:
b The standard injection box
b The LPCT test plug:
v integrated in the Sepam CCA670 connector
v or transferred by means of the CCA613 accessory.
The ACE917 injection adapter should be set according to the currents selected on
the CCA670 connector: the ACE917 setting should be equal to the number of the
microswitch that is set to 1 on the CCA670.
The injection value depends on the primary rated current selected on the CCA670
connector and entered in the Sepam general settings, i.e.:
b 1 A for the following values (in Amps): 25, 50, 100, 133, 200, 320, 400, 630
b 5 A for the following values (in Amps): 125, 250, 500, 666, 1000, 1600, 2000, 3150.
Block diagram (without CCA613 accessory)
Current
generator
Sepam
S20/S23/
T20/T23/M20
PCRED301005EN - 06/2008