17
Ultima MOS-5 Detector
4.0 Operation
4.1 Start-Up Checklist
Prior to starting the system, verify the following:
•
Inhibit any external devices, such as trip amplifiers, PLC, or DCS systems.
•
Verify that the optional settings are set for the desired configuration.
•
Verify that the unit is properly mounted. Ensure the conduit/cable gland entries are
pointed downward.
•
Verify that the signal wiring is correct.
•
Verify that the power supply is connected properly. The Ultima MOS-5 Intelligent
Sensor is powered by +24 VDC (20 to 36 VDC voltage range). The detector will output
a low voltage fault (F6) at 18.5 VDC or below.
•
Make sure the lid is securely installed or the area has been declassified.
•
Make sure the HART option is selected if desired.
•
Make sure Modbus is properly configured if desired.
4.2 Start-Up
Before applying power to the system for the first time, all wiring connections should be checked
for correctness and the housing cover replaced. Upon first power-up, the sensor may take up to
fifteen minutes to stabilize.
At the initial application of power, the unit test all LED segments by displaying “
88.8
”. The
software revision letter is then displayed for a few seconds. When the software revision level
appeared, the unit enters Operational Mode and the current gas concentration at the sensor will
be displayed. For details on Calibrating and Gas Checking the unit, see Sections 4.56 and 4.7.
4.3 Relay Reset
If the warn and alarm relays are configured as latching, they must be manually reset after an
alarm occurs. This can be accomplished by three different methods:
•
The relays can be reset by using a magnet. To do this, place the magnet over the MSA
logo on the cover of the unit. After 3 seconds, the display shows “rSt”. After the LED
displayed this code, remove the magnet. The relays are now reset (Figure 11).
