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220
Affinity User Guide
www.controltechniques.com Issue Number: 5
Single setpoint, dual feedback
(Pr
14.59
= 2 to 5)
PID1 feedback is from two sensors, which can be configured as shown
in the table below.
Dual setpoint, dual feedback
(Pr
14.59
= 6 to 7)
When PID mode 6 or 7 is selected the controller operates in a dual zone
mode. In this mode the reference and feedback quantities from each
PID controller are used to calculate two controller errors. These two
errors are then checked and the zone with the larger or smaller absolute
value of error (depending upon mode selected) is used as the error
signal to the PID1 controller.
11.21.5 Analog reference profile
If analog input 2 is used as a reference, then the following reference
profile can be configured.
For example, if the following is required:
•
Output frequency = 20 Hz when analog reference < 25%,
•
Output frequency = 60 Hz when analog reference > 75%,
•
Output frequency = linear ramp between 20 and 60 Hz when analog
reference is between 25 and 75 %, then the parameters should be
set as follows:
•
Pr
1.06
= 60
•
Pr
1.07
= 20
•
Pr
7.41
= 25
•
Pr
7.44
= 75
If Pr
7.41
is greater than or equal to Pr
7.44
, analog input 2 (Pr
7.02
) will
be forced to 0%, so the output frequency will always be equal to the
value in Pr
1.07
.
If Pr
7.41
is negative and Pr
7.44
positive, the minimum reference will be
forced to zero, so the profile will be as shown below.
Parameters Pr
7.41
and Pr
7.44
are 8 bit parameters so these only have
a resolution of 1%.
11.21.6 Braking Modes
This parameter does not affect the acceleration ramp, as the ramp
output always rises at the programmed acceleration rate subject to the
current limits. It is possible in under some unusual circumstances in
open-loop mode (i.e. highly inductive supply) for the motor to reach a low
speed in standard ramp mode, but not completely stop. It is also
possible if the drive attempts to stop the motor with an overhauling load
in any mode that the motor will not stop when standard ramp mode or
fast ramp mode is used. If the drive is in the deceleration state the rate of
fall of the frequency or speed is monitored. If this does not fall for 10
seconds the drive forces the frequency or the speed reference to zero.
This only applies when the drive is in the deceleration state and not
when the reference is simply set to zero.
0: Fast ramp
Fast ramp is used where the deceleration follows the programmed
deceleration rate subject to current limits.
1: Standard ramp
Standard ramp is used. During deceleration, if the voltage rises to the
standard ramp level (Pr
2.08
) it causes a controller to operate, the output
of which changes the demanded load current in the motor. As the
controller regulates the link voltage, the motor deceleration increases as
the speed approaches zero speed. When the motor deceleration rate
reaches the programmed deceleration rate the controller ceases to
operate and the drive continues to decelerate at the programmed rate. If
the standard ramp voltage (Pr
2.08
) is set lower than the nominal DC
bus level the drive will not decelerate the motor, but it will coast to rest.
The output of the ramp controller (when active) is a current demand that
is fed to the frequency changing current controller (Open-loop modes) or
the torque producing current controller (RFC). The gain of these
controllers can be modified with Pr
4.13
and Pr
4.14
.
Parameter 14.59
Final PID1 feedback
2
PID1 fe PID2 feedback
3
Lowest of PID1 feedback and PID2 feedback
4
Highest of PID1 feedback and PID2 feedback
5
(PID1 fe PID2 feedback) / 2
Parameter 14.59
PID1 Error
6
Lowest of |PID1 Error| or |PID2 Error|
7
Highest of |PID1 Error| or |PID2 Error|
Analog Reference
Maximum
frequency
(Pr
)
1.06
F
reque
ncy
Minimum
frequency
(Pr
)
1.07
Minimum reference
(Pr )
7.41
Maximum reference
(Pr )
7.44
NOTE
2.04
Ramp mode select
RW
Txt
US
OL
Ú
FASt (0), Std (1),
Std.hV (2)
Ö
Std (1)
RFC
FASt (0), Std (1)
NOTE
Maximum
frequency
(Pr
)
1.06
Fr
eq
uen
cy
Minimum
frequency
(Pr
)
1.07
Minimum reference
(Pr )
7.41
Maximum reference
(Pr )
7.44
NOTE
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