MCD3000 Series
✭ = factory setting
MG.15.A4.22 - VLT is a registered Danfoss trademark 19
Pro
rammin
Calibrates the MCD3000 motor thermal model for the
connected motors thermal capacity. The Motor
Thermal Capacity is defined as the length of time the
motor can sustain Direct-On-Line current.
Description of choice:
The factory setting is adequate for most applications.
When setting the Motor Thermal Capacity two
approaches can be taken.
1. Set according to the Motor DOL time as shown
on the motor data sheet. This makes the full
thermal capacity of the connected motor available
for use. The motor will be allowed to operate up to
its maximum capability during start and when
subjected to operational overloads.
This is ideal when starting high inertia loads or for
applications such as Bandsaws that must ride
through high operating overloads.
ATTENTION
The MCD3000 assumes Direct-On-Line
current to be 600% of motor Full Load
Current. Actual motor DOL current can be accounted
for by using the following formula to calculate the value
of the Motor Thermal Capacity setting.
2. Set according to load requirements. While the
Motor Thermal Capacity can safely be set
according to the motor’s published DOL time limit,
some load types do not need this capacity for
starting or riding through overloads while running.
In such circumstances setting the Motor Thermal
Capacity based on what the load requires will
provide an earlier warning of abnormal operation.
To set the Motor Thermal Capacity according to
load requirement, set MCD3000 display to read
motor temperature, run the load, stop and restart
the load while monitoring the calculated motor
temperature. The Motor Thermal Capacity setting
can be reduced until the temperature at the end of
a restart is approximately 80%.
7 Phase Imbalance Sensitivity
Value:
1 - 10 ✭ 5 (Normal Sensitivity)
1 - 4 = Increased sensitivity
5 = Normal sensitivity
6 - 10 = Reduced sensitivity
Function:
Sets the sensitivity of the imbalance protection.
Description of choice:
Adjust the trip point to accommodate the tolerated
phase imbalance. The factory setting is normally
acceptable but may have to be adjusted to
accommodate individual site variations.
Reaction time of the phase imbalance protection can
also be adjusted. Refer Par. 12 Phase Imbalance
Protection Delay.
ATTENTION
The phase imbalance trip point is desensitised
by 50% during starting and stopping.
8 Undercurrent Trip Point
Value:
15% - 100% Motor FLC
✭ 20 %
Function:
Sets the minimum allowable running current.
Description of choice:
Where it is desired to stop motor operation on
detection of an abnormally low current, set the
Undercurrent trip point above the motor magnetising
current and below the normal running current.
To defeat the Undercurrent protection function, set the
trip point below the motor’s magnetising current.
Typically < 25%.
Reaction time of the Undercurrent protection can also
be adjusted. Refer Par. 13 Undercurrent Protection
Delay.
Undercurrent protection is disabled during starting and
stopping.
9 Instantaneous Overload Trip Point
Value:
80% - 550% Motor FLC ✭ 400%
Function:
Sets the trip point for the Instantaneous Overload
protection.
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