Figure 3-12. example current limit setup, 5 calculate magnet inductance, Figure 3-12 example current limit setup – American Magnetics 05100PS-430-601 Integrated Power Supply System User Manual

Page 73: Operation

Rev. 5

Operation

Setup Menu : Load

The Current Limit setting can be used to limit the magnet current

to values lower than the Magnet Current Rating for testing or other

purposes (refer to Figure 3-12).

The value can be set by using either the numeric keypad per

the power supply is four quadrant, the Current Limit applies to

both the positive and the negative current direction (current limit

symmetry). The Model 430 Programmer will beep once and deny

the change if the user attempts to set the Current Limit below the

present Target Field Setpoint.

3.10.2.5

Calculate Magnet Inductance

This menu pick will automatically determine the inductance of the

load magnet. The inductance is determined by measuring the

voltage developed across the magnet (V

) 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.

After the

function is executed by pressing the

ENTER

key, the algorithm will

wait for 2 seconds to allow the current charge rate to stabilize and

Figure 3-12.

Example Current Limit Setup

+00.00 A — Magnet Inductance (H)

+0.00 Vs

Calculate