sepam 20 user manual - Schneider Electric

7
MT10587
Commissioning Maintenance
Sepam has a large number of self-tests that are
carried out in the base unit and in additional
modules.
The purpose of the self-tests is:
b To detect failures that can lead to nuisance
tripping or the failure to trip when a fault occurs
b To put Sepam in the fail-safe position to avoid
user errors
b To notify the operator that a maintenance
operation is required.
The "Sepam Diagnosis" screen of the SFT2841
software provides access to data on the status of
the base unit and optional modules.
SFT2841 "Sepam Diagnosis" screen.
CAUTION
HAZARD OF DAMAGE TO SEPAM
b Do not open the Sepam base unit.
b Do not attempt to repair any components in the
Sepam range, either in the base unit or an
accessory.
Failure to follow these instructions can cause
equipment damage.
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Shutdown of the base unit in fail-safe position
The base unit goes into the fail-safe position in the following conditions:
b Detection of an internal failure by the self-tests
b Sensor interface connector missing (CCA630, CCA634, CCA670 or CCT640
according to the type of application)
b No connection of one of the 3 LPCT sensors to the CCA670 (connectors L1, L2, L3)
b MES module configured but missing.
See “List of self-tests which place Sepam in the fail-safe position” page 4/17.
The fail-safe position is conveyed by:
b ON LED on
b LED on the base unit steadily on
b O4 "watchdog" relay in fault position
b Output relays dropped out
b All protection units inhibited
b Display showing fault message
01
b LED on DSM303 module (remote advanced UMI option) flashing.
Downgraded operation
The base unit is in working order (all the protection functions activated are
operational) and indicates that one of the optional modules such as DSM303,
MET148-2 or MSA141 is faulty or else that a module is configured but not connected.
See “List of self-tests which do not place Sepam in the fail-safe position” page 4/17.
According to the model, this operating mode is conveyed by:
b Sepam with integrated advanced UMI (UD base):
v ON LED on
v LED on the base unit flashing, including when the display is out of order (off)
v LED on the MET or MSA module faulty, steadily on.
The display shows a partial fault message and indicates the type of fault by a code:
v code 1: inter-module link fault
v code 3: MET module unavailable
v code 4: MSA module unavailable.
b Sepam with remote advanced UMI, UX base + DSM303:
v ON LED on
v LED on the base unit flashing
v LED on the MET or MSA module faulty, steadily on
v the display indicates the type of fault by a code (same as above).
Special case of faulty DSM303:
v ON LED on
v LED on the base unit flashing
v LED on DSM303 steadily on
v display off.
This Sepam operating mode is also transmitted via the communication link.
RTD fault
Each temperature monitoring function, when activated, detects whether the
temperature sensor associated with the MET148-2 module is short-circuited or
disconnected.
When this is the case, the alarm message "RTD FAULT" is generated.
Since this alarm is common to all 8 functions, the identification of the faulty sensor or
sensors is obtained by looking up the measured values:
b Measurement displayed "****" if the sensor is short-circuited
(T < -35°C or T < -31°F)
b Measurement displayed "-****" if the sensor is disconnected
(T > +205°C or T > +401°F).
Replacement and repair
When Sepam or a module is considered to be faulty, have it replaced by a new
product or module, since the components cannot be repaired.
PCRED301005EN - 06/2008