Alpha Technologies USM2.5 Status Monitor - Manual (Page 24)

8. Reference
24 704-683-B0-004, Rev. D
8.1 USM2.5 Signals, Quick Reference
IMPORTANT NOTE: In order for the USM2.5 to function correctly, OUTPUT (N) must be grounded to
the XM Series 2’s chassis! During normal operation this is automatically done though the SPI, but
during bench testing this ground will have to be manually maintained, by placing a jumper between
the Output Neutral and chassis ground.
Output Current 1
(Output Current
2 for ONU
equipped units
PIN
2
1
Signal
Name
Tamper Switch
Return
Tamper Switch
Type
(Ground)
Discrete
(In)
Signal Description
Return for Tamper Switch input to USM2-5 (same as J4 pins 1 and 12)
Tamper Switch input to USM
13
12 Ground
Analog
Ground
Scaled analog representation of UPS output current #2. Scaling: 0.4 VDC per Amp output
Ground reference for all signal and power (same as J5 pin 2 and J4 pin 1).
11
10
Test / Reset
Output Fail
Alarm
Discrete
(in)
Discrete
(Out)
Command to UPS to initiate and hold a UPS battery and inverter test. Pulling the signal to ground for >
100ms will initiate the inverter test. Releasing the signal will allow the test to end. If the UPS has a
latched alarm, successful completion of the test will clear the alarm.
Indicates the state of the UPS output. Signal pulled up to AUX DC.
9
AC Input
Voltage
Analog
Scaled representation of the UPS input voltage. Scaling set by UPS, input voltage can be
.0211 (120 in) or .0113 (240 in) Volts per input volt.
8 Analog Scaled analog representation of UPS output current #1. Scaling: 0.4 VDC per AMP output
7 Tamper Status
Discrete
(Out)
Indicates state of the enclosure tamper switch. Signal pulled up to AUX DC. Polarity of signal
determined by configuration.
6
Equipment Fail
Alarm
Discrete
(Out)
Indicates power supply equipment failure. Signal pulled up to AUX DC.
5 Battery Voltage Analog
Scaled analog representation of UPS battery pack voltage. Scaling set by configuration. Can be
.5 VDC or .15 VDC per battery volt.
4
AC Output
Voltage
Analog
Scaled representation of the UPS output voltage. Scaling set by configuration. Can be .5 VDC or
.15 VDC per output volt.
3
Standby / Line
Fail Alarm
Discrete
(Out)
Indicates the state of the UPS inverter. Signal pulled up to AUX DC.
2
Auxiliary DC
Out
Power Auxiliary output power for transponder. Voltage set by configuration; +5, +15, or +24 VDC
1 Ground Ground Ground reference for all signal and power (same as J5 pin 2 and J4 pin 12).
Output Current 2
(Output Current
1 for ONU
equipped units)