Alpha Technologies USM2.5 Status Monitor - Manual (Page 17)

4. Signal Definitions
17 704-683-B0-004, Rev. D
4.1 USM2.5 Signal Definition, continued
Name: AC Output Voltage
Pin: J4-4
Signal Type: USM2.5 Analog Output
Referenced to: Common (J4-1, J4-12)
Description: This pin provides a scaled, analog representation of the XM2’s
output voltage.
Parameters: This analog output should be 0.5VAC or 0.15VDC per VAC of the
XM2’s output. The calculated voltage should be within 5% of the
measured output voltage.
How to test: Verify voltage on pin #4 is 0.5VAC, or 0.15VDC per VAC of the
XM2’s output, as set by configuration. Front panel potentiometer
can be used to adjust the DC scaled voltage.
Name: Battery Voltage
Pin: J4-5
Signal Type: USM2.5 Analog Output
Referenced to: Common (J4-1, J4-12)
Description: This pin provides a scaled, analog representation of the XM2’s
battery string voltage.
Parameters: This analog output should read 0.1VDC, 0.3VDC, or 0.5VDC per
VDC of the XM2’s battery voltage, as set by configuration
SW1(pins 1 and 2).
How to test: Verify voltage on J3-5 is 0.1 VDC, 0.3VDC, or 0.5VDC per VDC of
the XM2’s battery voltage, as set by configuration.
Name: Equipment Fail Alarm
Pin: J4-6
Signal Type: USM2.5 Discrete Output
Referenced to: Common (J4-1, J4-12, J5-2)
Description: This USM2.5 output indicates the general health of the XM2.
Active Means: An active Equipment Fail Alarm pin indicates a ‘latched’ failure of
an automated, local or remote inverter test or some other major
alarm within the XM2. No matter the cause, an Equipment Fail
Alarm indicates the XM2 will NOT perform as required and
should be serviced. Once this condition has been detected by
the USM2.5, the Equipment Fail Alarm will stay active until reset
by the successful completion of a Self Test (either locally or
remotely).
Active State: LOW
Inactive Means: Utility AC line input is present and no inverter failures have been
detected.
Inactive State: HIGH
How to Test: Verify that Equipment Fail Alarm is not currently latched HIGH.
With utility AC line and batteries present, initiate a remote
inverter test (see description of Pin 11 Test/Reset). Next,
simulate a battery failure by Switching XM2’s battery circuit
breaker OFF, the Equipment Fail Alarm should go LOW. Close
the battery circuit breaker; the Equipment Fail Alarm will stay
LOW. To clear the Equipment Fail Alarm, initiate an inverter test,
wait one minute, stop the inverter test.