American Magnetics 4Q1005PS-430 Integrated Power Supply System - Manual (Page 67)

Rev. 5 49
Operation
Setup Menu : Load
by using either the numeric keypad per section 3.3 on page 25 or
the fine adjust knob (section 3.4 on page 26). The valid range is
from 0.0 to 100.0%. The default value is 0.0% unless preset by AMI
to match a specific superconducting magnet.
Superconducting magnets without a persistent switch require 1 a
specific Model 430 Programmer stability setting based on the
magnet inductance as follows:
For magnet inductance <= 100 Henries (H):
Stability Setting = (100 - H)
For magnet inductance > 100 Henries:
Stability Setting = 0
The graph below may be used as a guide to set the stability setting
for magnets with a persistent switch installed and inductance of
less than 3 henries. Magnets with an inductance of greater than 3
henries that have a persistent switch installed should operate with
a stability setting of 0.0%.
The Model 430 Programmer internal control loop gain is
proportional to the multiplier (100% – [Stability Setting]), except
that for a Stability of 100% the multiplier is set to a low non-zero
value suitable for controlling current in a short circuit. For this
1. Effective with Model 430 firmware version 1.62.
y g g
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7
Inductance (H)
Stab
ility Settin
g
(%)
Figure 3-9. Stability Setting vs. Magnet (with PSwitch) Inductance
Model 430 Stability Setting vs. Magnet Inductance
(for Magnets with Persistent Switch)