AMI 420, Installation, Operation And Maintenance Instructions, Page: 63 / 134

Rev. 7
45
Operation
Setup Menu : Load
ampere or Tesla/ampere. If the coil constant value is 0.0 kG/A (or
0.0 T/A), then the default display modes 3 and 4 are not available
(see paragraph 3.1). The default value is 0.0 kG/A unless preset by
AMI.
If the coil constant is not explicitly stated within the magnet
specifications, the value can be obtained by dividing the rated field
by the rated current.
3.2.2.3 Current Limit
The current limit specifies the master current limit associated with
a connected superconducting magnet. This limit will always be
observed during any ramping mode. If the power supply is bipolar,
then the current limit applies for both the positive and negative
current direction.
The current limit and voltage limit (see page 53) define the safe
operating region for the magnet within the full operating range of
the power supply as illustrated in Figure 3-4 below.
Note
The Voltage Limit can be directly accessed via the front panel
92/7$*(/,0,7
key.
$ × &XUUHQW/LPLW$
9V
V
I
10
-10
200 -200
EXAMPLE LIMITS
75 -75
r
Current Limit (A)
±2.5
± Voltage Limit (V)
AMI 4Q05100PS
OPERATING RANGE
Figure 3-4. Example limits setup.