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There are six limit values that can be set. These limits are checked when a Target value is
entered. If the target value exceeds any of the limits, an error is generated. The Actual values
are also checked when the 6600 is in the “Control” mode. If any of these limits is exceeded by
a pre-defined amount, an error will be generated and the 6600 will revert to “Measure” mode
on all three outputs.
Note:
When an Actual value exceeds the limit the 6600 will put all outputs into
Measure mode. To get back into Control mode, it is first necessary to temporarily increase
the limit so that the Actual values are within the new limit. If the limit is not increased, the
Actual value will continue to exceed the limit and will constantly generate an error,
preventing the outputs from going into Control mode.
An explanation of each limit follows:
1. Max. knots :
This defines the maximum airspeed that can entered as a Target value or
generated as an Actual value. Typically this is set to the maximum airspeed that the
instruments on the aircraft can tolerate. The maximum value for this limit is 1100 and the
minimum is 0. A typical setting for this limit is 500.0. The factory default is 400.0.
2. Max. Dfin :
This limit defines the maximum allowed differential between the Ps1 and
Ps2 outputs in inHg. If the limit is set to 3.0 then the maximum difference allowed between
Ps1 and Ps2 pressures is +/- 3.0 inHg. The maximum value allowed for this limit is 30.0 inHg
and the minimum is 1.0 inHg. The factory default is 3.0 inHg.
3. Max. Mach :
This limit is usually set to the maximum allowable Mach number that the
aircraft can tolerate. The maximum value for this limit is 5.0 and the minimum is 0.1 A
typical setting for this limit is 1.0. The factory default is 1.0.
4. Max. Feet :
This limit is usually set to the maximum altitude that the aircraft
instruments can tolerate. The maximum value is 80,000 and the minimum is 0. A typical
setting for this limit is 50,000. The factory default is 55,000.
5. Min. Feet :
This limit is usually set to the minimum altitude that the aircraft
instruments can tolerate. It is usually a negative number. The maximum value for this limit is
80,000 and the minimum is –16,000. A typical setting for this limit is –2000. The factory
default is -2000.
6. Max. Ft./min :
This limit is usually set to the maximum rate of climb that the aircraft
instruments can tolerate. It is usually limited to the maximum indication on the Vertical
Speed Indicator (VSI) on the aircraft. The maximum value for this limit is 50,000 and the
minimum is 100. A typical setting for this limit is 6000. The factory default is 6000.
Important Note:
There is an additional limit for minimum knots. This limit is set
to -200 knots and limits the negative differential between Pt and Ps1. This limit is not
adjustable by the user.
Summary of Contents for 6600
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