American Magnetics 4Q1005PS-430 Integrated Power Supply System - Manual (Page 105)

Rev. 5 87
Operation
Quench Detection : External Detection
used to clear the quench detect condition, or until the quench condition is
cleared by a remote command.
If the RESET QUENCH key has been locked
1
, the user will be asked to
enter the password to clear the quench. The entry of this password will not
unlock this reset quench feature, but will only reset the current quench
event so operation may resume. Enter the password followed by the
ENTER key to reset the quench and continue.
When the RESET QUENCH SHIFT-key is used to clear the quench
condition or a remote clear command is issued, the Model 430 Programmer
will automatically enter the PAUSED mode and will attempt to maintain
the current present at the point the quench condition was cleared.
3.15.1 External Quench Detection
The rear panel Quench I/O connector provides pins for external quench
input (contact closure — see page 149 of the Appendix for the connector
pinout). If the quench input is asserted, then the Model 430 Programmer
interprets this input as indication of a quench condition and the Model 430
automatically sets the power supply output voltage to zero and will not
respond to further input until the RESET QUENCH SHIFT-key is used to
clear the quench detect condition, or until the quench condition is cleared
by a remote command. The rear panel input cannot be disabled; however,
it may be left disconnected without the possibility of a generating a false
quench condition.
Note
If the external quench detection circuit continues to assert the
quench detection input of the Model 430 Programmer, the RESET
QUENCH SHIFT-key will be unable to clear the quench condition.
1. Refer to section 3.10.3.6.8 on page 63.
+44.36 A Quench Detect @ +80.56 A
+0.00 Vs PSwitch Heater: ON
+44.36 A Enter Password*
+0.00 Vs _