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T Series Data Sheet
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500 Watt AC-DC Converters
Table 14: System monitoring.
Signal status and LED display status depending on the situation of the various system elements
Possible Situation
Open collector output
LED
System Good Power Down
Sys OK
V o OK
Error
All OK
low
low
on
on
off
No mains and battery OK or no mains and V o > V t
2
high
low
off
on
on
Unit inhibited and battery OK or unit inhibited and V o > V t
Internal error
2
2
Sys In input
No mains and battery low or no mains and V o < V t
Short circuit on LT/UT output, V o < 4 V
Current limit LT/UT output, V o > 4 V, V o < V t
Battery chargers: sensor not connected or out of range
3
2
2
high
high
high
low
high
low
high
high
high
low
off
off
off
on
off
on
off
off
off
on
off
on 1
off
on
on
1
2
3
LED is on until the output capacitors are discharged.
Sys In connected to Vo–.
Sys In not connected to Vo– (single T status monitoring) or system status monitoring.
Display Status of LEDs
LED Sys OK
A green LED corresponds to the signal System Good. It lights,
if no internal or external error is detected.
LED V o OK
Another green LED indicates the output voltage status,
corresponding to the signal Power Down. The LED lights, as
long as V o exceeds the upper threshold level and has not
fallen below the low threshold level V t .
LED Error
This red LED lights, if one or more of the following conditions
are detected:
–
–
–
–
–
–
–
–
Input overvoltage
Input undervoltage (mains failure)
Output overvoltage
Output short circuit
Output voltage below threshold V t
Internal overtemperature
Internal circuit fault
i/Vcr remote control input error, such as:
- Inhibit voltage <2.5 V (rectifier models)
- Remote control voltage V cr out of range 5.3 – 14 V
(battery chargers)
- Sensor not connected, open remote control input.
BCD20023 Rev AB, 02-Nov-2010
Page 17 of 31
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