Signal definitions, Continued, 3 usm2 signal definition – Alpha Technologies USM2 User Manual
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©2000
™
704-587-B0-003 Rev.D
4.3 USM2 Signal Definition,
continued
Name:
AC Output Voltage
Pin:
J3-4
Signal Type:
USM2 Analog Output
Referenced to:
Common (J3-1, J3-12)
Description:
This pin provides a scaled, analog representation of the XM2’s output voltage.
Parameters:
This analog output should be 0.5VAC, 0.25VDC, or 0.15VDC per VAC of the
XM2’s output. A transponder will slightly load this analog pin when connected
to a USM2. Measured with transponder connected, the scaled output voltage
will be approximately 2% lower than expected (e.g. with a 60VAC output,
instead of 30VAC, a USM2 scaled output connect to a transponder may read
~29.4VAC).
How to test:
Verify voltage on pin #4 is 0.5VAC, 0.25VDC, or 0.15VDC per VAC of the XM2’s
output, as set by configuration.
Name:
Battery Voltage
Pin:
J3-5
Signal Type:
USM2 Analog Output
Referenced to:
Common (J3-1, J3-12)
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:
J3-6
Signal Type:
USM2 Discrete Output
Referenced to:
Common (J3-1, J3-12)
Description:
This USM2 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, 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 on page 19). Next, simulate a battery failure by Switching XM2’s
battery circuit breaker OFF, the Equipment Fail Alarm should go LOW. Reapply
the battery circuit breaker; the General Alarm will stay LOW. To clear the
Equipment Fail Alarm, initiate an inverter test, wait one minute, stop the
inverter test.
4. Signal Definitions