II K 6-21
Operating Instructions
n
Hints for speed controller autotuning
Only successfully commissioned selftuning will change
parameters of the speed controller Speed Reg KP
(5.07) and Speed Reg TI (5.08), other-wise parame-
ters remain unchanged. After selftuning the behav-
iour of the drive must be checked at low speed.
During selftuning the motor accelerates twice up two
80% nominal speed. The application must allow this,
if not, selftuning must not be carried out. In some
cases selftuning will be inhibited by the application.
What allows selftuning:
• motor decoupled from load
• motor + belt transmission
• motor + gear box
• motor + application with 10% load
What inhibits selftuning:
• oscillating load
• full load / overload
• high inertia ( causes long reaction periods)
It is not recommended to start selftuning with:
• cranes / elevators (selftuning is disregarding the lift
height)
n
Speed Autotuning failed
If autotuning fails during Commissioning Wizard:
• Reset the alarm by pressing the MENU button at
the operating panel.
• Press ENTER and follow the Commissioning Wiz-
ard up to the end.
• After finishing the Wizard the speed controller
can be adjusted in the following way:
• Set parameter Act Filt 1 Time (5.29) = 0.01s and
start autotuning (*)
• If fails set Act Filt 2 Time (5.30) = 0.01s and start
autotuning again (*)
• If fails set Act Filt 1 Time (5.29) = 0.02s and start
autotuning again (*)
• If fails set Act Filt 2 Time (5.30) = 0.02s and start
autotuning again (*)
• If fails again and again try to find out the right values
via manually speed tuning. In most cases Speed
Reg KP (5.07) = 1.000 and Speed Reg TI (5.08) =
100.0ms is helpful as a start condition.
Only successfully commissioned selftuning will change
parameters of the speed controller Speed Reg KP
(5.07) and Speed Reg TI (5.08), other-wise parame-
ters remain unchanged. After selftuning the behav-
iour of the drive must be checked at low speed.
(*) To start the speed controller autotuning set param-
eter Contr Service (7.02)=Sp Autotun and start the
drive by using LOC and (I) button at the operating
panel DCS400PAN or ON and RUN command at the
terminals.
n
Drive accelerates to overspeed
With default parameter values (defaults: KP=0.200 /
TI=5000.0 ms) and slow ramps it may happen, that
the drive accelerates to overspeed limit bypassing
maximum speed . This is a result of the extremely high
integration time constant. In this case P- and I- values
have to be corrected via selftuning or manual actions.
If parameters are set manually, you should start with
values given below:
Speed Reg KP (5.07) = 1.000
Speed Reg TI (5.08) = 100.0 ms
Check reaction at low speed and if needed continue
adapting values.
n
Oscillating speed
P-value too high and / or I-value too low.
Set:
Speed Reg KP (5.07) = 50%
Speed Reg TI (5.08) = 200%
of actual values.
Check reaction at low speed and if needed continue
adapting values.
n
Change of speed feedback
If speed feedback is changed from Encoder to Ana-
log Tacho or to EMF control the speed controller
response may be possibly too fast. P- and I-values
have to be adapted. In case of manual adaption set:
Speed Reg KP (5.07) = appr. 50%
Speed Reg TI (5.08) = appr. 200 …400%
of actual values.
Check reaction at low speed and if needed continue
adapting values.
n
Motor does not meet set speed
• Not enough torque available:
Too low field current (1.03).
Too low armature current (1.01).
Check motor data and parameters.
• Speed control too weak:
Check Speed Reg KP (5.07) and Speed Reg TI
(5.08).
• Speed limits not set accordingly:
Base Speed (1.05), Max Speed (1.06), Speed
Lim Fwd (5.31), Speed Lim Rev (5.32).
• Tacho not adjusted (R115).
• Encoder Inc (5.03) not correct.
To Next Page
Loading...
