MCD3000 Series
✭ = factory setting
18 MG.15.A4.22 - VLT is a registered Danfoss trademark
Pro
rammin
Sets the initial starting current for the Current Ramp
start mode. See also parameter 4.
Description of choice:
See parameter 4.
4 Current Ramp - Ramp Time
Value:
1 - 30 seconds
✭ 1 second
Function:
Sets the ramp time for the Current Ramp start mode.
Description of choice:
The Current Ramp start mode modifies the Current
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
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).
2. On generator set supplies where a gradual
increase in current is required to allow greater
time for the generator set to respond to the
increased loading.
In this case make the following settings.
• Set Parameter 2 Current Limit as desired.
• Set Parameter 3 Current Ramp - Initial
Current to a lower level than the Current Limit.
• Set Parameter 4 Current Ramp - Ramp Time
to achieve the desired gradual draw of start
current.
5 Soft Stop Ramp Time
Value:
0 - 100 seconds
✭ 0 seconds (Off)
Function:
Sets the time of the soft stop ramp. The soft stop
function extends motor deceleration time by ramping
down voltage supplied to the motor when a stop is
initiated.
Description of choice:
Set the ramp time to optimise stopping characteristics
for the load.
The MCD3000 soft stop function has two modes,
standard and enhanced pump control. The enhanced
pump control mode can offer superior performance in
some pumping applications. Refer Par. 17 Soft Stop
Profile.
ATTENTION
The MCD3000 soft stop function automatically
determines the step-down voltage setting, no
user adjustment is required.
ATTENTION
The Soft Stop and D.C.Brake functions cannot
be used together. Setting a soft stop ramp
time greater than 0 seconds causes Par. 18 D.C.Brake
- Brake Time to be set to 0 seconds and Par. 38 Relay
C - Function Assignment to be set to OFF.
6 Motor Thermal Capacity
Value:
5 - 120 seconds
✭ 10 seconds
Function:
(11 pages)
(12 pages)
(10 pages)
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