American Magnetics 430, Инструкции по установке, эксплуатации и обслуживанию

Страница: 106 / 254

90 R
EV
9
A
MERICAN
M
AGNETICS
, I
NC
. O
PERATION
: S
ETUP
S
UBMENU
D
ESCRIPTIONS
: P
ROTECTION
S
UBMENU
overrides the internal quench detection function of the Model 430
and cannot be disabled. For further discussion of the quench
detection logic and operation, please refer to on page 123.
A
DDITIONAL
Q
UENCH
D
ETECTION
S
ELECTIONS
If the optional
Operational Limits f(T)
functionality is enabled (see
page 91), then the quench detection menu includes some
additional selections as illustrated below:
As described previously, the quench detect can be set to
Off
and
is inactive. If set to
Current
, the detection is based on magnet
current only which is the same as the base quench detection
functionality as described above.
If set to
Tmax
, the detection logic will only be based on the input
temperature from an external measurement device that is
connected to Auxiliary Input 3 on the rear panel of the Model 430
(see page 202).
If set to
Both
, the quench detection logic will operate on both the
magnet current
and
the temperature measurement provided via
Auxiliary Input 3. If either violates the predefined detection logic,
a quench will be detected.
Q
UENCH
S
ENSITIVITY
This picklist value specifies the sensitivity (formerly called “rate”)
of the quench detection algorithm. The default “Normal” value will
be appropriate for most magnets. Occasionally, some magnets
quench very slowly and the value of this parameter may need to
be adjusted to a more sensitive value so that the Model 430
Programmer detects the gradual, slow quench.
The available range for this parameter is five (5) steps from least
to most sensitivity. If the magnet quenches and the Model 430
Programmer does not detect the quench, the sensitivity should
39. Refer to page 200.
+50.00 A — Enable Quench Detect?
+0.50 Vs Off Current Tmax Both
+50.00 A
P
Quench Sensitivity (Rate)
+0.50 Vs Less < Normal > More