Using the digital operator
Page 41 / 52
DC brake
braking time
A 55
N
The time during which the DC brake is activated can be
configured from 0.0s through 60s.
0.0
Function
Display *)
Function description / parameter setting range
Standard
setting
Set
values
Upper/lower limiter, jump frequency
A 61
A 62
Upper fre-
quency limit
Lower fre-
quency limit
0V
10V
f
f
0Hz
t
Acceleration 1
Acceleration
15
25
35
0,5Hz
0,5Hz
15Hz
Jump width
0,5. jump
(
A 64
)
Accel. 2
Frequency
upper limit
A 61
N
Setting range 0.5Hz–360Hz.
(When 0.0 is entered, this function is not active).
0.0
Frequency
lower limit
A 62
N
Setting range 0.5Hz–360Hz
(When 0.0 is entered, this function is not active).
0.0
1. jump frequency
A 63
N
Setting range 0.1Hz–360Hz
(When 0.0 is entered, this function is not active).
0.0
1. jump frequency
width
A 64
N
Setting range 0.1Hz–10Hz
(When 0.0 is entered, this function is not active).
0.5
2. jump frequency
A 65
N
Setting range 0.1Hz–360Hz
(When 0.0 is entered, this function is not active).
0.0
2. jump frequency
width
A 66
N
Setting range 0.1Hz–10Hz
(When 0.0 is entered, this function is not active).
0.5
3. jump frequency
A 67
N
Setting range 0.1Hz–360Hz
(When 0.0 is entered, this function is not active).
0.0
3. jump frequency
width
A 68
N
Setting range 0.1Hz–10Hz
(When 0.0 is entered, this function is not active).
0.5
Function
Display *)
Function description / parameter setting range
Standard
setting
Set
values
PID control
Introduction
The PID closed loop control has been designed with a control variable of “frequency in Hz” where the proportional gain
(k
p
), the integral gain (T
N
), and the differential gain (T
V
) of the control algorithm can be set independently from each
other. The set value and the actual value are scaled in % (setting range 0–100%). For a better presentation of these
values they can be scaled and displayed in the desired physical engineering unit (e.g. flow or throughput of 0 to 30l/h).
The PID control output is limited to a lower limit of 0 Hz (or the frequency set under
A 62
) and to the frequency set
under
A 04
(or
A 61
, respectively) as an upper limit. This ensures that the motor running direction will not be reversed
when a negative deviation is present.
In order to optimize the PID control’s behaviour it is advisable to keep acceleration and deceleration times as short as
possible.
Set value
Function
A 01
is used to configure the method by which the set value is input and also the terminal where it is input:
Set value
Parameter
Scaling
Built-in potentiometer
00
0–100%
Function
F 01
02
(0–100%) * (parameter value of function
A 75
)
Multistage frequencies
A 20
...
A 35
-
(0–100%) * (parameter value of function
A 75
)
Analog input O (0–10V)
01
0–100% (independant of
A 11
thru
A 14
)
Analog input OI (4–20mA)
01
0–100% (independant of
A 11
thru
A 14
)
Actual value
For input of the actual value, one of the two analog inputs available (O or OI) can be used. The adjustment of the
actual value is done using functions
A 11
through
A 14
. (This adjustment of the actual value has already been
described as “set value adjustment” earlier in this manual. However, this description is only correct when the PID
(
To be continued on next page
)
Содержание L2000 Series
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