VLT
®
2800 Series
Programming
Description of choice:
To be set as a percentage value of the max. DC
brake voltage, which depends on the motor.
133 Start voltage
(START VOLTAGE)
Value:
0.00 - 100.00 V
✭ Depends on unit
Function:
A higher start torque can be obtained by increasing
the start voltage. Small motors ( < 1.0 kW)
normally require a high start voltage.
Description of choice:
The factory setting will be suitable for must
applications, the value may need to be increase
gradually for high torque application.
Warning: If th e use of start vo ltage
is e xaggerated, this may lead to
over-energizing and overheating of the
motor and t he frequency converter may cut out.
134 Load compensation
(LOAD COMPENSATIO)
Value:
0.0 - 300.0%
✭ 100.0%
Function:
In this parameter, the load characterist ic is set. By
increasing the load c ompe nsation, the motor is g
iven an
extra voltage and frequency supplement at increasing
loads. This is used e.g. in motors/applications in
which there is a big difference between th
e full- load
current and idle-load current of the motor.
NB!:
If this value is set too high, the frequency
converter m ay cut out because of overcu
rrent.
Description of choice:
If the factory setting is not adequate, load
compensation must be set to enable the motor
tostartatthegivenload.
Warning: S hould be set to 0% in
connection with synchro nous and
parallel-coupled motors and in the
case of quick load changes. Too high load
compensation may lead to instability.
135 U/f-ratio
(U/F RATIO)
Value:
0.00 - 20.00 at Hz
✭ Depends on unit
Function:
This parameter enables a shift in the ratio between
output voltage (U) and output frequency (f) linearly,
so as to ensure correct energizing of the motor and
thus opt imum dynamics, accuracy and efficiency.
The U/f-ratio only affects the voltage characteristic
if a selection has bee n made of Constant torque
[1] parameter 101 Torque characteristic.
Description of choice:
The U/f-rat io is only to be changed if it is not
possible to set the co rrect motor data in parameter
102-109. The value programmed in the factory
settings is based on idle operation.
136 Slip compensation
(SLIP COMP.)
Value:
-500 - +500% of rated slip compensation
✭ 100%
Function:
Slip compensation is calculated automatically, on
the basis of such data as the rated motor speed
n
M,N
. In this p arameter, the slip compensation c an be
fine-tuned, thereby compensating for tolerances on
the value for n
M,N
. Slip compensation is only active if
a selection h as been made of Speedregulation, open
loop [0] in parameter 100 Configuration and Constant
torque [1] in parameter 101 Torque characteristic.
Description of choice:
Key in a % value.
✭ = factory setting. () = di splay text [] = value for use in communication via serial communicat ion port
MG.28.E9.02 - VLT is a registered Danfoss trademark
75
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