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
_
Summary of Contents for 05100PS-430-601
Page 2: ......
Page 10: ...x Rev 5 List of Figures ...
Page 12: ...xii Rev 5 List of Tables ...
Page 18: ...xviii Rev 5 Foreword Safety Summary ...
Page 30: ...12 Rev 5 Introduction Operating Characteristics ...
Page 42: ...24 Rev 3 Installation Power Up Procedure ...
Page 114: ...96 Rev 5 Operation Summary of Operational Limits ...
Page 156: ...138 Rev 5 Remote Interface Reference Error Messages ...
Page 168: ...150 Rev 5 Service Return Authorization ...
Page 226: ...208 Rev 5 Index ...
