Hardware
Lynx II DSA User's Manual – 7096089 103
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 II’s built-in Current Overload Latch, with
the exception that it is triggered by an external module, such as LN
2
Monitor. The Lynx
II’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 Positive polarity selected, an open input
will enable 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 an 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 a result of the Inhibit Latch, the internal Current
Overload Latch, or the internal voltage monitor latch will assert an 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 rear panel’s HV indicator will indicate
Fault (red). The HV field on the front panel LCD display will also show Fault.
Additionally, the Reset button will display as 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 II to
release the latch. The high voltage power supply will remain ‘latched’ off 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.
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