R
EV
9
187
A
MERICAN
M
AGNETICS
, I
NC
.
S
ERVICE
: T
ROUBLESHOOTING
H
INTS
3. Check the value of the Voltage Limit. Refer to page 66.
NOTE
If an energy absorber is present in the system, the Model 430
Programmer must command enough power supply voltage to
overcome any forward voltage drop due to the energy absorber.
Increase the Voltage Limit to account for the +5 VDC energy
absorber voltage drop.
4. Check for excessive wiring resistances in the magnet-power supply loop
which may prevent proper charge/discharge voltages at the magnet. Use the
local voltmeter on the power supply to see if the proper voltages exist across
the various components in the magnet power loop. Loose or oxidized inter-
connections often exhibit excessive resistances.
C
ANNOT
D
ISCHARGE
THE
M
AGNET
AT
THE
S
ELECTED
R
AMP
R
ATE
NOTE
Rapid discharging of the magnet requires either an energy
absorbing component or a four-quadrant power supply. If a
unipolar supply is used without an energy absorbing component,
only the resistance of the power leads is available as a mechanism
for discharging the magnet.
1. Ensure that the persistent switch heater is on and the switch heated time has
expired. Ramping is disabled during the switch heating period.
2. Check the value of the Voltage Limit. Refer to page 66.
3. For
unipolar power supply systems
, an energy absorber is usually required
to ramp a magnet down in a reasonable amount of time. When ramping the
system down at the fastest rate achievable, observe the voltage appearing at
the power supply output terminals either by a voltmeter on the front of the
supply or by a DVM measurement. If the supply output voltage is approxi-
mately zero, the resistance of the power leads (not the Model 430 Program-
mer) is dictating the maximum ramp down rate. An energy absorber is
necessary to increase the rampdown rate.
C
ANNOT
C
HARGE
THE
M
AGNET
TO
D
ESIRED
F
IELD
1. For
unipolar power supply systems
, if the power supply ramps to full output
current after the supply output voltage exceeds approximately 0.7 V, verify
the polarity of the power supply protective diode.
Ensure the protective
diode remains installed
across the output terminals of the power supply
with the anode at the
negative terminal and the cathode at the positive termi-
nal.
2. Ensure any voltage or current adjust controls on the front of the power sup-
plies that may override remote programming are in their fully clockwise posi-
tion.
3. Ensure that the Model 430 Programmer supply setup submenu is configured
to match the connected power supply, e.g. check that the Model 430 Pro-
grammer is configured for the proper voltage-to-voltage programming range
according to page 78.
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 ...
