GE Fuji Electric AF-300 Mini Startup Manual page 71

NOTE: Analog input under the bias reference point is
limited by the bias data.
The relations stated above are indicated in the following
expressions.
(1) If analog input ≤ bias reference point:
Frequency Setting 1(%) = Bias (F18)
(2) If analog input > bias reference point:
In the above expressions, it is assumed that each func-
tion code expresses its data.
Example: Setting the bias, gain and its reference point
when analog input range from 1 to 5 Vdc is selected for
the frequency command 1.
(Point A)
If the analog input is at 1 V, the set frequency is 0 Hz.
Therefore, the bias is 0% (F18 = 0). Since 1 V is the bias
reference point and it is equal to 10% of 10 V, then the
bias reference point should be 10% (C50 = 10).
(Point B)
If the analog input is at 5 V, the set frequency comes
to be the maximum value. Therefore, the gain is 100%
(C32 = 100). Since 5 V is the gain reference point and
it is equal to 50% of 10 V, then the gain reference point
should be 50% (C34 = 50).
NOTE: When using the function codes for setting a
standalone gain or bias without changing any reference
points, the setting procedure for the function codes is
the same as that of GE Fuji's conventional drive models.
F20 to DC Brake (Starting frequency,
F22 Braking level, and Braking time)
These function codes enable a dc brake to prevent the
motor from coasting by its inertia while it is decelerat-
ing to a stop. Set function codes F20 for the starting
frequency, F21 for the braking level, and F22 for the
braking time as follows.
CAUTION:
The brake function of the drive does not provide me-
chanical holding means.
Otherwise injuries could occur.
F43, Current Limiter (Operation condition and
F44 Limiting level)
F43 enables or disables the current limiter. If it is
enabled, the drive controls the output frequency while
keeping the current set to the value in F44 in order to
prevent the motor from stalling.
With F43, you may select whether the current limiter
works during constant speed operation only (F43 = 1) or
during both acceleration and constant speed operation
(F43 = 2). Set F43 to 1, for example, to drive the motor
at maximum performance in the acceleration zone and
to limit the drive current in the constant speed zone.
WARNING
If the current limiter function has been selected, the
drive may operate with an acceleration/deceleration
time or frequency different from those set. Design the
machine so that safety is ensured even if this happens.
Otherwise an accident could occur.
F50, Electronic Thermal (Discharging capability
F51 and Allowable loss)
These function codes configure the electronic thermal
feature to protect the braking resistor from overheating.
For built-in braking resistors, set function codes F50 and
F51 to 0 and 0.00, respectively.
NOTE: Depending on the energy dissipation margin of
the braking resistor, the electronic thermal protection
may operate and issue the overheat alarm "dbH," even
though the actual temperature of the resistor is within
limits. Check braking resistor performance again and
review the data setting of function codes F50 and F51.
E01
to
Command Assignment for Terminals [X1]
E03,
to [X3], [FWD] and [REV]
E98,
E99
E01 to E03, E98 and E99 may assign commands (listed
below) to terminals [X1] to [X3], [FWD], and [REV] which
are general-purpose programmable input terminals.
These function codes may also switch the logic system
between normal and negative to define the property
of those input terminals so that the drive logic may
interpret either the ON or OFF status of each terminal
as active. The default setting is normal logic, that is
"Active ON."
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