AKD 2800
■
Load and Motor
100 Configuration
(CONFIGURATION)
Value:
✭
Speed control, open loop
(SPEED OPEN LOOP)
[0]
Process control, closed loop
(PROCESS CLOSED LOOP)
[1]
Function:
This parameter is used to select the configuration
to which the frequency converter is to be adapted.
This makes adaptation to a given application
simple, since the parameters not used in a given
configuration are hidden (not active).
Description of choice:
If
Speed control, open loop
[0] is selected, normal
speed control is obtained (without feedback
signal) with automatic load and slip compensation
to ensure a constant speed at varying loads.
Compensations are active, but may be disabled in
parameter 134
Load compensation
and parameter
136
Slip compensation
as required.
If
Process control, closed loop
[3] is selected, the
internal process regulator is activated to enable precise
control of a process in relation to a given process
signal. The process signal can be set to the relevant
process unit or as a percentage. A feedback signal
must be added from the process and the process
regulator must be set in parameter group 400
Special
functions
. Process closed loop is not active if a
DeviceNet card is mounted and Instance 20/70 or
21/71 is chosen in parameter 904
Instance types
.
101 Torque characteristic
(TORQUE CHARACT)
Value:
✭
Constant torque
(CONSTANT TORQUE)
[1]
Variable torque high
(TORQUE: HIGH)
[2]
Variable torque high with CT start
( VT HIGH CT START)
[3]
Special motor mode
(SPECIAL MOTOR MODE)
[4]
CT = Constant torque
Function:
This parameter enables a choice of principle for
adaptation of the U/f ratio of the frequency converter
to the torque characteristic of the load.
Description of choice:
If
Constant torque
[1] is selected, a load-dependent U/f
characteristic is obtained, in which output voltage and
output frequency are increased at increasing loads in
order to maintain constant magnetization of the motor.
Select
Variable torque high
[2], if the load is
square (centrifugal pumps, fans).
High with CT start
[3], are selected if you need a
greater breakaway torque than can be achieved
with the three first characteristics.
NB!:
Load and slip compensation are not active
if variable torque or special motor mode
have been selected.
Select
Special motor mode
[4], if a special U/f setting
is needed that is to be adapted to the present
motor. The break points are set in parameters
423-428
Voltage/frequency
.
Select Constant Torque [1] for use with compressors.
Select Variable torque high [2] for use with condenser
fans or pumps. Use Special motor mode [4] if
several fans are connected in parallel.
NB!:
Please note that if a value set in the nameplate
parameters 102-106 is changed, there will
be an automatic change of parameter 108
Stator resistance
and 109
Stator reactance
.
102 Motor power P
M,N
(MOTOR POWER)
Value:
0.25 - 22 kW
✭
Depends on unit
Function:
Here you must set a power value [kW] P
M,N
,
corresponding to the motor
’
s rated power. The
factory sets a rated power value [kW] P
M,N
, that
depends on the type of unit.
Description of choice:
Set a value that matches the nameplate data on the
motor. Settings between one size below and one
size over the factory setting are possible.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.H2.02 -
18