88 MG.30.A7.02 - VLT
®
is a registered Danfoss trademark
✮ = Factory setting. Text in ( ) = Display text.
The figures in [ ] are used in bus communication.
Parameter description 1.. Load and motor
Function:
Adjustment of the VLT
®
frequency convert-
er’s U/f characteristics to the load torque’s
characteristics.
Description of choices:
Variable torque (VT) low, medium or high
is selected if the load is quadratic (centrifu-
gal pumps, fans). Choice of torque should
normally be made with due consideration
of problem-free operation, lowest possible
energy consumption and least possible
acoustic noise.
Variable torque (VT) low, medium or high
with constant torque (CT) start is selected if
there is a need for higher break-away
torque than can be achieved with the three
aforementioned characteristics. The con-
stant torque curve is followed until the set
reference is reached, after which the vari-
able torque characteristics are followed.
Constant torque without start compensa-
tion is a load-independent U/f characteristic
used for parallel-coupled motors and
synchronous type motors.
Constant torque with start compensation is
a load-dependent U/f characteristic where
the output voltage is increased on increas-
ing load (current) to maintain con-stant
magnetization of the motor and to compen-
sate for loss in the motor during start.
Constant torque with 4 quadratic slip
compensation has the same function as
described for [7] but with slip compensation
for both motor and regenerative op-
eration. Slip compensation on regenerative
operation will usually require use of the
brake option/module. However, the slip
compensation is only active if the function
is selected in parameter 101.
100
Load
(Load type)
Value:
Variable torque low (VT mode-low) [0]
Variable torque medium
(VT mode-med) [1]
Variable torque high (VT mode-high) [2]
VT low CT start (VT low W/CT) [3]
VT medium CT start (VT med W/CT) [4]
VT high CT start (VT high W/CT) [5]
Constant torque (CT mode) [6]
✭ Constant torque compensated
(CT with comp) [7]
CT 4 quadratic with slip
compensation (CT W 4Q COMP) [8]
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