Programmable Functions - Danfoss MCD3000 Series Manual

Programmable functions

1 Motor FLC
Value:
(Depends On Model) Amps
Function:
Calibrates the MCD3000 for the Full Load Current of
the motor.
Description of choice:
Set according to motor nameplate Full Load Current.
2 Current Limit
Value:
100% - 550% Motor FLC
Function:
Sets the desired starting current limit.
Description of choice:
The current limit should be set so that the motor
accelerates easily to full speed.
ATTENTION
Start current must be great enough to allow
the motor to produce sufficient torque to
accelerate the connected load. The minimum current
required to do this is dependent on motor design and
load torque requirements.
3 Current Ramp - Initial Current
Value:
10% - 550% Motor FLC
= factory setting
MG.15.A2.22 – VLT is a registered Danfoss trademar
MCD3000 Series
Sets the initial starting current for the Current Ramp
start mode. See also parameter 4.
Depends on Model
See parameter 4.
1 - 30 second
Sets the ramp time for the Current Ramp start mode.
The Current Ramp start mode modifies the Current
350%
Limit start mode by adding an extended ramp.
Typically the Current Ramp start mode would be used
in two circumstances.
1. For applications where start conditions vary
350%
Function:
Description of choice:
4 Current Ramp - Ramp Time
Value:
Function:
Description of choice:
between starts the Current Ramp mode provides
an optimum soft start irrespective of motor
loading e.g. A conveyor that may start loaded or
unloaded.
In this case make the following settings.
•
Set Parameter 2 Current Limit so that the
motor can accelerate to full speed when fully
loaded.
•
Set Parameter 3 Current Ramp - Initial
Current so that the motor can accelerate
when unloaded.
•
Set Parameter 4 Current Ramp - Ramp Time
according to the desired start performance.
(Very short ramp time settings will result in
higher than necessary start current for
unloaded starts. Very long ramp time settings
may cause starting delays for loaded starts).
1 second
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