Fuji Electric Frenic-Mini - Page 106

5-25
The relations stated above are indicated in the following expressions.
(1) If analog input bias base point:
(F18) Bias = (%)1SettingFrequency
(2) If analog input > bias base point:
(%)1SettingFrequency
inputAnalog
point)base(Biaspoint)base(Gain
(Bias)(Gain)
×
−
−
=
point)base(Biaspoint)base(Gain
point)base(Bias(Gain)point)base(Gain(Bias)
−
×−×
+
C50C34
C50C32C34F18
inputAnalog
C50C34
F18C32
−
×−×
+×
−
−
=
In the above expressions, each function code expresses its data.
Example:
Setting the bias, gain and their base points when analog input range from
+1 to +5 VDC is selected for frequency command 1
(Point A)
If the analog input is at 1 V, to specify the reference frequency at 0 Hz, set the bias
at 0% (F18 = 0). Since 1 V is the bias base point and it is equal to 10% of 10 V, then
set the bias base point at 10% (C50 = 10).
(Point B)
If an analog input is at 5 V, then set the gain at 100% (C32 = 100) to keep frequency
at the maximum value. Since 5 V is the gain base point and it is equal to 50% of 10
V, set the gain base point at 50% (C34 = 50).
When using the function codes for setting a gain or bias alone without
changing any base points, the setting procedure for the function codes is
the same as that of Fuji conventional inverter models (FVR-C9S,
FVR-C11S, etc.).
F20 to F22
H95
DC Braking (Braking starting frequency, Braking level, and Braking time)
DC Braking (Braking response mode)
These function codes specify the parameters for DC braking, a mechanism to
prevent the motor from coasting due to the inertia of moving loads while it is de-
celerating to a stop. During a decelerated stop cycle, i.e., when any Run command
"OFF" has been issued or the reference frequency has dropped below the stopping
frequency, DC braking is invoked as soon as the output frequency has reached the
starting frequency (F20) for DC braking.
Set function codes F20 for the starting frequency, F21 for the braking level, and F22
for the braking time. Optionally, you can also select the quick-response DC braking
with H95.