Chapter 5 Web-Based Operations
100
Lynx DSA User's Manual - 9240227J
Inhibit Polarity
The
Enable Inhibit function
disables
(Off) or
enables
(On) the High Voltage
Supply's Inhibit Latch triggered by the detection of the inhibit signal present on the
rear panel’s HV INH connector.
The Inhibit Latch operates similarly to the Lynx’s built-in Current Overload Latch,
with the exception that it is triggered by an external module, such as LN
2
Monitor.
The Lynx’s interpretation of the external inhibit signal also depends on the
Inhibit
Polarity
setting and
Reset
button.
The
Inhibit Polarity
sets the polarity of the High Voltage Power Supply’s inhibit
signal. Defaults to
Positive
for
active high
operation. Selecting
Negative
reverses the
polarity and operation, where:
•
Positive Polarity
is used with Mirion preamplifiers. The 'enable' condition
(cold detector) is an open circuit or active high signal ranging from +1.2 V to
+24 V; Inhibit condition (warm detector) is a signal ranging from –24 V to
<+1.2 V or ground, including ground (0.0 V). With
Negative
polarity
selected an open input will disable the high voltage.
•
Negative Polarity
is used with preamplifiers and LN
2
monitors, where the
'enable' condition (cold detector) is a signal ranging from –24 V to <+1.2 V
including grounds (0.0V); Inhibit condition (warm detector) is open circuit or
active high signal ranging from +1.2 V to +24 V. With
Negative
polarity
selected an open input will disable the high voltage.
Detection of a fault condition, either as result of the Inhibit Latch, the internal
Current Overload Latch, or the internal voltage monitor latch will assert a HVPS
Fault, shut down the HVPS and begin ramping the output voltage to zero. The
Status
& Fault
LEDs for HVPS will indicate Fault (yellow), and the front panel’s HV
indicator will indicate Fault (red). Additionally, the
Reset
button (will reflect in red
as a further indication of the Fault condition).
Once the high voltage power supply is in a Fault condition, the
Reset
button will
change to red and must be pressed or a Reset Fault command must be received by the
Lynx to release the latch. The high voltage power supply will remain ‘latched’ and
cannot be turned back
On
until the Fault has been cleared, and the condition that
caused it has been fixed. If the condition persists, a new Fault will be reasserted
shortly after clearing it. In some cases fault indications will remain latched until
cleared through the
Maintenance
|
Diagnostics
|
Status
option.
