Danfoss VLT 3522 User Manual

VLT
®
Series 3500
62
★ = ROM default setting. ✔ = Normal Danfoss setup. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
Group 1 -- Load and Motors
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]
Variable torque low with constant torque start
(VT LOW W/CT) [3]
Variable torque, medium, with constant torque
start (VT MED W/CT) [4]
Variable torque, high, with constant torque
start (VT HIGH W/CT) [5]
No operation (NO OPERATION) [6]
No operation (NO OPERATION) [7]
No operation (NO OPERATION) [8]
Variable torque with AEO function and
constant torque start (ENERGY CT.ST) [9]
★ Variable torque, low, with AEO (ENERGY VT.L)* [10]
Variable torque, medium, w/AEO (ENERGY VT.M)* [11]
✔ Variable torque, high, with AEO (ENERGY VT.H)* [12]
Function:
This parameter allows the drive’s V/Hz pattern to be tai-
lored to the requirements of the load. Low V/Hz means re-
duced energy consumption and less motor noise. Too low
a V/Hz pattern results in poor speed regulation or the inabil-
ity to start the load.
With the factory setting [10], the AEO function (Automatic
Energy Optimizing) is active. This means that the drive au-
tomatically adjusts the voltage to the present load from the
pump or fan motor. This ensures optimum efficiency and
minimum motor noise. The AEO function is active above
20% of f
MAX
(parameter 202).
Description of choice:
Variable torque (VT) low [0], medium [1] or high [2] is cho-
sen if the motor torque load is proportional to the square of
the speed (centrifugal pumps and fans). The choice of
torque characteristic should be made taking into account
the need for trouble-free operation, minimum energy con-
sumption and the lowest possible acoustic noise level.
Variable torque (VT) low [3], medium [4] or high [5] with
constant torque (CT) start
is selected if there is a need for a
greater breakaway torque than that available with variable
torque start. The curve for constant torque is followed until
the speed reference is reached. Variable torque operation
is provided after that. The magnitude of the starting voltage
is controlled by parameter 109.
Variable torque with AEO function and constant torque start
[9] is selected if the variable torque characteristic is un-
known and there is a need for a high breakaway torque.
When the desired speed reference has been reached, the
AEO function will adjust the voltage to the optimum value,
which minimizes motor noise and maximizes efficiency.
Variable torque low [10], medium [11] and high [12] with
AEO is selected when the starting torque is relatively low.
The AEO function is active; it adjusts the voltage to the load
which minimizes motor noise and maximizes efficiency.
* There is only one AEO curve available for the VLT Type
3575-3800, and for the 208/230 V VLT Type 3542-3562.
Parameters [10], [11] and [12] all select the AEO VT LOW
curve.
NOTE:
When multiple motors will be run at once, it is not
advisable to use the AEO function.
101 Speed Control (SPEED CONT)
Value:
★ Open loop (OPEN LOOP) [0]
Closed loop (CLOSED LOOP) [2]
Function:
It is possible to choose two different kinds of speed control:
Open loop and closed loop .
Description of choice:
Open loop [0] is chosen if normal control is desired.
Closed loop [2] is chosen if operation with process feed-
back is required. The closed loop PID controller must be set
up through parameter 119 to 125.

Danfoss VLT 3522 Specifications

General

Brand	Danfoss
Model	VLT 3522
Category	DC Drives
Language	English