Danfoss MCD3000 Series Manual page 19

7 Phase Imbalance Sensitivity
Value:
1 - 10
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
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.
= factory setting
MG.15.A2.22 – VLT is a registered Danfoss trademar
5 (Normal Sensitivity)
20 %
MCD3000 Series
9 Instantaneous Overload Trip Point
Value:
80% - 550% Motor FLC
Function:
Sets the trip point for the Instantaneous Overload
protection.
Description of choice:
The instantaneous overload trip point should be set to
trip the motor when it begins to stall.
Reaction time of the instantaneous overload protection
can also be adjusted. Refer Par. 14 Instantaneous
Overload Protection Delay.
Instantaneous Overload protection is disabled during
starting and stopping.
10 Excess Start Time Protection
Value:
0 - 255 second
Function:
Sets the maximum allowable start time.
Description of choice:
Set for a period slightly longer than the normal motor
starting time. The MCD3000 will then trip if the start
time exceeds normal. This provides early indication
that the application conditions have changed or that
the motor has stalled. It can also protect the soft
starter from being operated outside its rated start
capability.
ATTENTION
Ensure the Excess Start Time protection
setting is within the MCD3000 rated capability.
11 Phase Rotation Protection
Value:
0 - 2
0 = Off (Forward & Reverse rotation permitted)
1 = Forward Rotation Only
2 = Reverse Rotation Only
Function:
Sets the allowable phase rotation sequence of the
incoming supply.
400%
20 seconds
0 (Off)
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