Section 3. Operation

TTL Shutdown

TTL Shutdown

TTL Shutdown allows the output of the power supply to be disabled by a logic level signal. This input is optically isolated from the power supply output and will withstand a highpot test potential of 600Vac minimum. When TTL shutdown is activated, the front panel LED comes on.

Connect the signal source between J5 connector pins 15 (TTL shutdown/positive) and 2 (TTL shutdown return/negative).

Set rear panel switch S1-1 (TTL shutdown) to ON (closed) to obtain positive logic (high signal enables output). The factory-set default is switch OPEN for negative logic (high signal disables power supply output).

Switch SW1-1 Setting

TTL Signal Level

Output Condition

OPEN (Negative logic)

HIGH

OFF

 

LOW

ON

 

 

 

CLOSED (Positive logic)

HIGH

ON

 

LOW

OFF

Notes:Minimum activation signal required: 2V at 500µA

Maximum activation signal allowed : 25Vdc

24

Operating Manual for APG for XT/HPD Series Power Supply

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Xantrex Technology APG-HPD, APG-XT manual TTL Shutdown

APG-HPD, APG-XT specifications

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