Signal definitions, Continued, 3 usm2 signal definition – Alpha Technologies USM2 User Manual
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©2000
™
704-587-B0-003 Rev.D
4. Signal Definitions
4.3 USM2 Signal Definition,
continued
Name:
Tamper Switch Status
Pin:
J3-7
Signal Type:
USM2 Discrete Output
Referenced to:
Common (J3-1, J3-12)
Description:
USM2 output indicates the current state of the XM2’s enclosure tamper switch.
This is a non-latching type alarm.
Active Means:
The enclosure door is opened or the tamper switch is disconnected.
Active State:
HIGH
Inactive Means:
The enclosure tamper switch is properly connected and the door is closed.
Inactive State:
LOW
How to Test:
Disconnect any tamper switch from the USM2 TMPR connector. Short USM2
TMPR connector; the USM2 tamper status (pin #7) should go LOW. Remove
the short on USM2 TMPR connector (open circuit) and the Tamper Status output
should go HIGH.
Name:
Output Current #1
Pin:
J3-8
Signal Type:
USM2 Analog Output #1
Referenced to:
Common (J3-1, J3-12)
Description:
This USM2 analog output is a DC approximation of the total XM2 AC output #1
current.
Parameters:
0.4VDC per AC ampere XM2 output.
How to Test:
Verify voltage on J3-8 is 0.4VDC per AC ampere XM2 output #1.
NOTE:
Due to design improvements and changes the Quick Charge function is no longer supported, however, some
“old” USM2 may still have this function. The Quick Charge definition remains only as a reference, current
configurations do not have this feature.
Name:
Quick Charge
(Not used in newer versions of the USM2)
Pin:
J3-9
Signal Type:
USM2 Discrete Input
Referenced to:
Common (J3-1, J3-12)
Description:
This USM2 input controls the mode of the XM2 charger. Allowing remote
initiation of a charger Accept mode. This control signal originates from the
transponder.
Active Means:
The XM2 has been commanded to initiate and hold a battery charger Accept
mode.
Active State:
LOW
Inactive Means:
The XM2 charger is no longer commanded to hold an Accept mode. The charger
may return to Float. Disconnected from a transponder, this USM2 input defaults
to the inactive state.
Inactive State:
HIGH
How to test:
To perform a test of the Charger Accept pin, disconnect the transponder from
the USM2. With line and battery applied to the XM2, carefully short & hold the
Charger Accept J3-9 to ground (J3-1). The XM2 charger should immediately
enter Accept mode, verified by the Charger Mode screen on the Smart Display.
Release J3-9 from ground and the charger should return to Float mode.