American Magnetics 05200PS-430-601 High Stability Integrated Power Supply System - Manual (Page 109)

Rev. 5 91
Operation
Quench Detection : External Detection
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 156 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.
3.15.2 Disabling Internal Quench Detection
The internal quench detection feature may be disabled in the Load
submenu 2 . However, the rear panel Quench I/O connector output remains
active.
If the internal quench detection feature is disabled, the Model 430
Programmer attempts to limit the error between the commanded current
and the present current to a value that will not result in excessive voltages
being introduced across the magnet terminals. Under most operating
conditions this will not damage any internal protection circuits of the
1. Refer to section 3.10.3.6.8 on page 67.
2. Refer to section 3.10.2.13 on page 61.
+44.36 A Enter Password*
+0.00 Vs _