82
R
EV
9
A
MERICAN
M
AGNETICS
, I
NC
.
O
PERATION
: S
ETUP
S
UBMENU
D
ESCRIPTIONS
: L
OAD
S
UBMENU
S
ENSE
M
AGNET
I
NDUCTANCE
This menu pick will start a process to measure the inductance of
the load magnet. The inductance is determined by measuring the
voltage developed across the magnet (V
m
) with a fixed
di/dt
(current rate-of-change in A/sec) passed through the load.
The
function must be executed with the magnet ramping.
35
When the
sense is initiated by pressing the
ENTER
key, the algorithm will
wait for 2 seconds to allow the charge rate to stabilize and then
make voltage and current measurements, calculate the
inductance, and display the result.
The sensed magnet inductance is automatically saved as the
present magnet inductance and is immediately used to adjust the
control gains if the Model 430 is configured for Auto stability
mode (see page 78).
If the magnet is persistent, not ramping, or encounters a ramp
rate change during the measurement, the measurement will be
aborted with a displayed error notification, and any existing
magnet inductance value is retained.
M
AGNET
I
NDUCTANCE
The magnet inductance submenu displays the present
inductance value for the magnet load and allows manual entry of
a new value or initial guess (an initial guess within ~25% is
adequate). The magnet inductance value
is saved
between
power cycles.
The magnet inductance value, when entered, is immediately
used for control gain configuration if the Model 430 is set for Auto
stability mode (see page 78).
35. See page 111.
0.00 A — Sense Magnet Inductance?
0.00 Vs
Calculate (start w/ENTER)
+46.19 A
Sense Magnet Inductance?
+0.50 Vs
32.13 H
0.00 A — Magnet Inductance (H)
+0.50 Vs
32.13
Summary of Contents for 430
Page 2: ......
Page 16: ...XVI REV 9 AMERICAN MAGNETICS INC FOREWORD SAFETY SUMMARY ...
Page 28: ...12 REV 9 AMERICAN MAGNETICS INC INTRODUCTION OPERATING CHARACTERISTICS ...
Page 64: ...48 REV 9 AMERICAN MAGNETICS INC INSTALLATION POWER UP AND TEST PROCEDURE ...
Page 208: ...192 REV 9 AMERICAN MAGNETICS INC SERVICE RETURN AUTHORIZATION ...
Page 248: ...232 REV 9 AMERICAN MAGNETICS INC APPENDIX SHORT SAMPLE MODE ...
