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Note: * indicates Stop Ramp time is not controlled
by DMS. Motor will coast to stop.
Trip Class selection:
This setting is applicable only for the Extended
versions of DMS.
The DMS motor overload protection is an advanced
motor thermal model. Motor temperature is
continuously calculated by the microprocessor.
This uses a sophisticated mathematical model
to accurately reflect motor heat generation and
dissipation during all stages of operation, e.g.
Starting, Running, Stopping & Stopped.
Because it operates continuously, the motor thermal
model eliminates the need for protection systems such
as Excess Start Time, Limited Starts per hour etc.
Calibrate the DMS motor thermal model for theTrip
Class of the connected motor. The Motor Trip
Class is defined as the length of time the motor
can sustain Locked Rotor Current. The motor
Trip Class can be found from the motor curves
or data sheet. For example, if a given motor can
withstand Locked Rotor Current for 10 sec, set
Trip Class 10 (or lower) in the DMS.
If in doubt, use "Trip Class 5", which is the Factory
Default setting for this parameter. With this setting,
the DMS will trip & protect the motor if the Locked
Rotor current sustains for more than 5 secs.
FLC setting table :
DIP Switch bits
2 (B2)
3 (B3)
4 (B4)
5 (B5)
6 (B6)
MG.90.F2.22 - VLT is a registered Danfoss trademark
Value (Amps)
3.2
1.6
0.8
0.4
0.2
6.3 Amps, when B2-B6
are all On
Decentral Solutions
# In some applications, actual ramp time on the
motor shaft could differ from the settings.
Use the DIP switches A5-A6 to choose the Trip Class.
Trip Class selection table :
Trip Class
5
6
Time
(A5)
(A6)
(sec)
5
Off
Off
10
Off
On
20
On
Off
0
On
On
Full Load Current setting:
This setting is applicable only for the Extended
versions of DMS and refers to the ETR function. It
may not be used for current limitation.
Calibrate the DMS for the connected motor
nameplate Full Load Current (FLC).
Use the five (5) DIP switches B2-B6 to add up to motor
nameplate FLC minus 0.1 Amps. (0.1 Amps is added
internally to the FLC amps. read from the DIP switches)
Please note that switch B1 is not used.
Example-1 for setting
FLC=4.3 Amps
On
Off
On
Off
On
0.1+3.2+0+0.8+0+0.2
= 4.3
See remark
Remarks
Trip Class 5
Trip Class 10
Trip Class 20
Motor Protection off
Example-2 for setting
FLC=2.9 Amps
Off
On
On
On
Off
0.1+0+1.6+0.8+0.4+0
=2.9
See remark
51
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