American Magnetics 4Q12125PS-430 Integrated Power Supply System - Manual (Page 55)

Rev. 5 37
Operation
Shift Key Commands : Reset Quench
If Voltage Limit becomes active while ramping, it will be indicated by a
reverse illumination character “V” for the status indicator.
Once the Voltage Limit function becomes active, the current, and therefore
field, will no longer be ramping linearly with time as the voltage available
to charge the magnet will be reduced as the total loop voltage will be
limited. As the IR drop of the leads increased with current, the voltage
available to charge the magnet will be reduced.
3.7.3 Reset Quench SHIFT-key
The RESET QUENCH SHIFT-key is used whenever a quench detection has
occurred and is being indicated on the display (example shown below).
When a quench detection has occurred, the Model 430 Programmer will
respond to no further input until the RESET QUENCH SHIFT-key is used,
or until the quench condition is cleared by a remote command. See Refer to
section 3.15 on page 86.
3.7.4 Increment Field SHIFT-key
The INCR. FIELD SHIFT-key is used to manually increase the field. This
is done at the defined ramp rate.
When the INCR. FIELD SHIFT-key is used, the current/field begins
ramping up. If the INCR. FIELD SHIFT-key is used again (while the
current/field is manually ramping up), the ramping will be paused.
Alternately, the RAMP / PAUSE key may be pressed to pause manual
ramping. Manual ramping will continue until paused or the Current
Limit
1
or Magnet Current Rating is achieved.
Note
If the current/field is negative, using the INCR. FIELD SHIFT-key
to increase (make more positive) the current/field, the magnitude of
the current/field decreases.
1. Refer to section 3.10.2.4 on page 52.
+40.92 A Mode: Ramping
+2.50 Vs V PSwitch: ON
+0.00 A - Quench Detect @ +45.81 A
+0.00 Vs
PSwitch Heater: ON