sepam 20 user manual - Schneider Electric

Control and monitoring
functions
PCRED301005EN - 06/2008
Self-tests and fail-safe position
Selecting the trip command and examples of
use
An analysis of the operational reliability of the whole installation should determine
whether availability or safety of this installation should be prioritized if Sepam is in the
fail-safe position. This information is used to determine the choice of trip command as
outlined in the table below.
CAUTION Selecting the trip command
RISK OF UNPROTECTED INSTALLATION
Diagram Control Event Trip Advantage Disadvantage
Always connect the watchdog output to a
1 Shunt trip breaker Sepam failure or No Availability of Installation not
monitoring device when the selected trip
or mechanical loss of the
the installation protected until
command does not result in the installation
tripping when Sepam fails.
latching contactor auxiliary power
supply
remedial
intervention
Failure to follow these instructions can cause
equipment damage.
(1)
2 Breaker with
undervoltage trip
Sepam failure or Yes
loss of the
Safety of the
installation
Installation not
available until
coil (fail-safe) auxiliary power
remedial
supply
intervention
3 Breaker with Sepam failure No Availability of Installation not
undervoltage trip
the installation protected until
coil (not fail-safe)
remedial
intervention (1)
Loss of auxiliary Yes Safety of the Installation not
power supply
installation available until
remedial
intervention
(1) It is essential to use the watchdog, see the warning notice opposite.
DE80351
Inhibit closing
Closing
O2
O11
N/O
closing
coil
8
7
L
2
3
O1
Trip
5
4
Example of use with shunt trip coil (diagram 1)
Shunt
trip
coil
Breaker closed Breaker open
4 M 1 M
5 I12 2 I11
Setting the Sepam output parameters:
O1: N/O
O2: N/C
O11: N/O
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