Microdrive Series Instruction Manual
4201-109 Rev I
54
SETTING UP The particular arrangement of limits and set
points on the Microdrive offers a great
degree of flexibility, depending upon the
values chosen.
Generally the reference frequency setpoints
will be set within the bounds of the
maximum and minimum frequencies.
Setting a reference setpoint above the
maximum frequency will result in a top end
deadband control region. Setting a
reference setpoint below the value of the
minimum frequency will result in the
Microdrive stopping when the frequency
demand falls below the minimum frequency
unless run at minimum frequency (Screen
78) is selected. A special case of this is the
setting of reference setpoint 1 below the
minimum frequency to ensure that the
Microdrive switches off upon the loss of the
frequency control signal.
Bidirectional analogue control is possible by
setting the reference setpoints with positive
and negative values.
Inverse control (lower input levels cause
higher output frequencies) is possible by
setting the reference setpoint 1 to a higher
value than reference setpoint 2.
21, 22, 23, 24 FREQUENCY CONTROLS
Screen 21 MIN FR= 0.0Hz
Description MINIMUM FREQUENCY
Min/Max 0.0/MAX FREQUENCY
Units HERTZ
Screen 22 MAX FR= 60.0Hz
Description MAXIMUM FREQUENCY
Min/Max MIN FREQ/200
Units HERTZ
Screen 23 FR F1= +0.0Hz
Description REFERENCE FREQUENCY SETPOINT 1
Min/Max -200/+200
Units HERTZ
Screen 24 FR F2=+60.0Hz
Description REFERENCE FREQUENCY SETPOINT 2
Min/Max -200/+200
Units HERTZ
FUNCTION Minimum Frequency:
Sets a minimum frequency below which the
Microdrive cannot be set to run. If run at
minimum frequency (Screen 78) is enabled
(Y) then the Microdrive will operate at the
minimum frequency if the absolute value of
the reference is set below the minimum. If
run at minimum frequency is disabled (N),
then the Microdrive will stop under the
above conditions.
Maximum Frequency:
Sets a maximum frequency above which the
Microdrive cannot be instructed to run.
Demand (by any control input) of an
absolute value greater than this frequency
will be clamped to this frequency.
Inch controls allow operation below the
minimum frequency.
Reference Frequency Setpoint 1:
Sets the reference frequency that is
demanded by the minimum level of the
selected analogue (010V or 420mA)
frequency input.
Reference Frequency Setpoint 2:
Sets the reference frequency that is
demanded by the maximum level of the
selected analogue (010V or 420mA)
frequency input.
The maximum and minimum frequency
limits dictate the absolute bounds of
frequency of operation, regardless of input
source (except inch).
The reference frequency setpoints dictate
the range of values commanded by the
selected analogue frequency input (values
between the setpoints are linearly
interpolated).
The reference frequency setpoints also
control the bounds of switch speed control
and motorised potentiometer control
(Screen 66).
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