19
★
= ROM default setting. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
VLT
®
Series 2000
Programming
110 Start Compensation (START COMP)
Value:
0.00 - 99 V/A
Function:
Using this parameter you acn make a load dependent
torque adaptation. This is for example used for motors and
applications where there is a large difference between the
motor's full-load current (parameter 107) and no-load
current (parameter 108).
Description:
If the factory setting is not sufficient, you can set the
parameter so that the motor can start at the actual load.
You can also combine start compensation with parameter
109.
111 V/f Ratio (V/F RATIO)
Value:
0.00 - 20 V/Hz
Function:
Using this parameter you can change the linear ratio
between voltage (V) and frequency (f) to correct motor
magnetization, optimal dynamics, accuracy or efficiency.
Description:
Use this parameter only if you cannot record the correct
motor data in parameters 104 and 105.
The value can be calculated as follows:
Motor voltage (para. 104)
Motor frequency (para. 105)
The value of the factory setting is based on no-load
operation. Therefore it is lower than the value calculated.
The compensation will give the necessary voltage
supplement.
For factory settings refer to the Parameter Chart in the back
of this manual.
107 Motor Current (MOTOR CURR)
Value:
I
MAG (par. 108)
- I
VLT, MAX (par. 209)
Function:
It is important to specify the rated motor current because it
is used in part to calculate torque and thermal motor
protection, (ETR),
Description:
The rated motor current, which can be seen from the motor
nameplate, must be entered. This is also chosen in Quick
Set Up Menu step 2.
108 Motor Magnetizing Current (MOTOR MAG AMP)
Value:
0.3 - I
M,N (par. 107)
Function:
The VLT uses the value for different calculations such as
compensation.
Description:
If the factory setting is unsuitable, the motor current on
running idle should be measured with suitable
amperemeter (RMS). The magnetizing current is then set to
the measured value.
109 Start Voltage (START VOLT)
Value:
0 to (V
M,N
+ 10%)
Function:
By increasing the start voltage, a high start torque can be
obtained. Small motors (<1 HP) normally require a high
start voltage. When motors are connected in parallel, it
may be desirable to increase the starting torque.
Description:
Do not forget to consider that the motor must be able to
start with the required torque:
1. Choose a value to make start possible with the load in
question.
2. Reduce value until starting up with the given
load is just possible.
3. Choose a value where operation in the rest of the
frequency range is possible at the lowest possible
current consumption.
If the start voltage makes normal operation impossible, you
can change the V/f ratio in parameter 111.
V/f =
∆
!
WARNING: Should not be used with
synchronous motors and parallel-coupled motors
and where quick load changes may occur. To
avoid instability do not increase the value more
than necessary.
∆
!
WARNING: If the use of start voltage is
excessive, it can lead to magnetic saturation and
motor overheating.
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