American Magnetics 430, Инструкции по установке, эксплуатации и обслуживанию

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84 R
EV
9
A
MERICAN
M
AGNETICS
, I
NC
. O
PERATION
: S
ETUP
S
UBMENU
D
ESCRIPTIONS
: S
WITCH
S
UBMENU
If
NO
is selected, the various settings are
not
made available
within the Switch submenu and the
PERSIST. SWITCH
CONTROL
key becomes inoperable.
The default value is
YES
unless preset by AMI to match a
specific superconducting magnet.
PS
WITCH
C
URRENT
D
ETECT
(
M
A)
This function will automatically determine the proper value of
heater current in a persistent switch installed on a magnet
connected to the power supply system. The power supply should
be energized and at zero current. When the
ENTER
key is
pressed to initiate the process, the following steps occur:
1. The persistent switch current is set to 0.1 mA.
2. The power supply current is ramped to 2 A at 0.1 A/sec.
3. After the power supply current reaches 2 A, the persistent switch cur-
rent is slowly increased (as shown on the display) until the Model 430
Programmer detects a change in the load, indicative of the persistent
switch transitioning from superconducting to resistive. Before this
transition is detected, the display will show the heater current value
as it is increased in the persistent switch heater; the magnet current
is changed back to zero during this process.
4. The current that was present when the superconducting to resistive
transition occurred is displayed.
NOTE
If the PSwitch Current determined by this method is accepted as
described below, the detection process will exit to the heated
switch mode with zero amps being delivered to the magnet.
5. If the
ENTER
key is pressed, the determined value of PSw current is
stored in the Model 430 Programmer. If the escape key is pressed,
0.00 A
P
PSwitch Current Detect(mA)
0.00 Vm Auto detect
+2.00 A
P
PSwitch Current Detect(mA)
+0.37 Vm Detecting...(26.7mA)
0.00 A
P
PSwitch Current Detect(mA)
0.00 Vm 27.2