II K 6-22
Operating Instructions
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Motor drifts at zero speed reference
Eliminate speed offset via Tacho Offset (5.34)
• switch drive OFF
• read Speed Actual from panel
• set Tacho Offset (5.34) to this value incl. polarity
• switch drive ON and finetune Tacho Offset (5.34)
Eliminate speed offset via alternative parameters
(5.21…5.25) of speed controller
• switch drive OFF
• read Speed Actual from panel
• set Speed Level 1 (5.16) to twice this value without
polarity
• set Alt Par Sel (5.21) = Sp < Lev1
• set Alt Speed KP (5.22) = Speed Reg KP (5.07)
• set Alt Speed Ti (5.23) = 0.0s
• set Alt Accel Ramp (5.24) = Accel Ramp (5.09)
• set Alt Decel Ramp (5.25) = Decel Ramp (5.10)
• switch drive ON and finetune Speed Level 1 (5.16)
Eliminate speed offset via additional Fixed Speed
(5.13 / 5.14)
• switch drive OFF
• read Speed Actual from panel
• set Fixed Speed 1 / 2 (5.13 / 5.14) to this value incl.
polarity
• set Aux Sp Ref Sel (5.26) = Fixed Sp1 / 2
• switch drive ON and finetune Fixed Speed 1 / 2
(5.13 / 5.14)
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Gear protection
The DCS 400 has no gear protection. However, using
the alternative parameters it is possible to reach a
smooth rotation change over, if the alternative param-
eter set is activated and Alt Speed KP (5.22) and Alt
Speed TI (5.23) are set to appropriate values.
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Comments to flux optimisation
When selftuning motor accelerates to 50% nominal
speed. The application must allow this. If not do not
selftune.
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Flux adaptation failed
Check parameter Diagnosis (7.03) and read chapter
6.4.7
Diagnostic Messages
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Change macro
• When changing macros all parameters set Macro
depend will be changed as well.
• If parameters originally set Macro depend have
been switched individually, they will not change.
• In case SDCS-CON-3A will be exchanged, we
recommend to set all parameters to Factory Set-
ting to ensure that all values from former applica-
tions will be extinguished.
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Regenerative mode plus
fieldweakening
If a DCS 400 is intended to be used in regenrative
mode including field-weakening we recommend the
following sequence to switch the drive on:
• Switch ON command only at zero speed.
• Switch RUN command at any time possible
Reason: If ON and RUN are given, to regenerate with
reduced field, it may happen, that the field current
cannot be reduced fast enough caused by the time
constant of the field winding, which results in arma-
ture overvoltage and blown fuses.
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Using motors with nominal armature
current less than 4 A
The armature current range for DCS 400 is
20 A…1000 A. Possible parameter setting for that is
4 A…1000 A. Motors with an armature current less
than 4A are usually not supported because of arma-
ture autotuning function. To make sure that armature
autotuning works right a minimum current of 20% of
nominal converter current is necessary. In case of
smallest DCS401.0020 minimum current is 20% of
20 A = 4 A.
That’s the reason why not possible to set parameter
Arm Cur Nom (1.01) less than 4 A.
For using motors with armature current nominal
lessthan 4A it’s necessary to set parameter Arm Cur
Max (3.04) less than 100% !
e.g. Motor armature current nominal = 2,4 A
Set Arm Cur Nom (1.01) = 4 A
Set Arm Cur Max (3.04) = 60%
Arm Cur Max (3.04) is related to Arm Cur Nom (1.01)
meaning maximum armature current is 60% of motor
nominal current. Maximum current in this case is 2,4A
for normal operation.
But armature autotuning works always with Arm Cur
Nom (1.01). That means motor will be tuned with 4A!
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