Siemens SITRANS LU SAM, Инструкция по эксплуатации

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7ML19985CF02 SITRANS LU SAM – INSTRUCTION MANUAL Page 7
Operation
Relay setpoints and function are established when programming the associated
application device. Refer to the associated instruction manual.
When power to the SITRANS LU SAM is applied, the Power / Data LED (center)
illuminates to indicate the power on condition. All relays default to the energized state,
relay LEDs off, until updated by the application device.
The Power / Data LED flashes whenever a valid message is received from the application
device. If the LED does not flash, check for faulty communication wiring.
The buffers associated with the individual relay points hold the received data until it is
updated, controlling the relay and the relay LED status accordingly. When an alarm ON
status is received, the programmed relay de-energizes and the corresponding LED lights.
As the buffers are updated subject to the scan sequence as programmed into the
application device, relay and LED status are independent of the application device LCD
display.
On interruption of power, all relays de-energize (LEDs off), but the stored status is
memorized for ten minutes. Once power is restored, all relays revert to their previous
status, if the memory is intact, and normal operation resumes.
If SW1 - 7 is closed, relay 20 is redefined as a Loss of Communication (LOC) alarm. If
communication is broken for 5 minutes or more, the relay de-energizes and its associated
LED lights. When communication is re-established, or by opening SW1 - 7, the relay and
LED resume their normal operating status.
The SITRANS LU SAM may be tested in two ways:
1.
Via the associated application device. Refer to the associated instruction manual.
2. Via the TEST switch SW1 - 6, located at the upper right corner of board A.
Test overrides the normal operation of all 20 relays. The status LEDs sequentially flash on
and off until switch 6 is reset (0) for normal operation of the SITRANS LU SAM. During
test, the SITRANS LU SAM buffer is updated if communication has continued. Upon
resumption of normal operation, the relays and LEDs assume the status found in the
buffer.
8
5
MIN
5
MIN
7 8 7 8 7 8 7
5
MIN
5
MIN
Loss of Communication Normal
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TEST TEST
5 6 7 5 6 7 5 6 7 5 6 7
TEST TEST
Test
Normal
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