1 external quench detection, 2 disabling internal quench detection, Operation – American Magnetics 05100PS-430-601 Integrated Power Supply System User Manual

Page 107

Rev. 5

Operation

Quench Detection : External Detection

If the

RESET QUENCH

key has been locked

, 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 153 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

. 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 65.
2. Refer to section 3.10.2.13 on page 59.

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