POWER ELECTRONICS
SDRIVE 700
DESCRIPTION OF PROGRAMMING PARAMETERS
77
Parameter
Name /
Description
Range
Default
value
Function
Set on
RUN
7 I SLIP=2.0%
I SLIP COMPENSAT
G19.2.7
/ Current
limit factor
0.0 – 20.0%
2.0%
Modifies the speed by reducing the output frequency to keep the
output current within a controllable margins (display shows LTI).
Adjusting this parameter can improve the stability of the current limit
function taking the motor slip into account.
Note:
We recommend this value is adjusted only when the current
limit action is unstable. A low value will improve the stability
although the current limit action will operate earlier.
YES
9 STR FRQ = 0.0%
START FREQUENCY
G19.2.9
/ Initial
frequency
0.0% to
100%
0.0%
Allows setting of an initial frequency that will be applied from the
drive at the moment of starting.
YES
10 V/H BREK=OFF
FRQ V/Hz CHANGE
G19.2.10
/
Frequency V/Hz
change
OFF=0.0,
0.1 – 100%
OFF
In some applications, during a certain frequency range, excessive
current oscillation may be generated, and this may cause the drive
trip in overcurrent or over voltage protections.
In order to avoid these oscillations, this parameter must be
decreased down to a certain frequency value below which, a special
algorithm will be implemented. This algorithm will improve the
instability of the drive. This parameter operates together with
parameters G19.2.11 and G19.2.12.
Note:
Whenever there is no instability in the system (installation), do
not modify the default value of this parameter.
YES
11 STA F AC=OFF
STABILIZE F ACC
G19.2.11
/
Stabilize factor in
acceleration
80.0 –
99.9%,
OFF=100%
OFF
This parameter operates together with parameter G19.2.10. In
general, by decreasing the value of this parameter, the instability
during acceleration period will be reduced.
YES
12 STA F DC=OFF
STABILIZE F DEC
G19.2.12
/
Stabilize factor in
deceleration
80.0 –
99.9%,
OFF=100%
OFF
This parameter operates together with parameter G19.2.10. In
general, by decreasing the value of this parameter, the instability
during deceleration period will be reduced.
YES
13 CTR Vbus=OFF
REGEN BUS VOL
G19.2.13
/
Regeneration
bus voltage
625 – 799V,
OFF=800V
OFF
If the setting of previous parameters G19.2.10, G19.2.11 and
G19.2.12 has not been enough to reduce instability, then, in case of
fault ‘F2 V LIM FLT’ is produced, decrease the value of this
parameter until fault disappears. The optimum result will be
obtained when this parameter is used together with the previous
parameters G19.2.10, G19.2.11 and G19.2.12.
YES
10.18.3.
Subgroup 19.3 – S19.3: Motor Model
Parameter
Name /
Description
Range
Default
value
Function
Set on
RUN
1 R STATOR=0.9%
STATOR RESISTOR
G19.3.1
/ Stator
resistance (Rs)
0.0 – 9.9%
0.9%
Set as a percentage of motor rated impedance.
This parameter is used to compensate for motor voltage drop. It is
very important for applications with large torque transients,
especially at low speed. If the resistance value entered is very too
low then the motor torque produced will be reduced. When this
value is increased, then torque boost will be increased. Please, see
the following table for approximate Rs values according to the motor
power ratings:
Power (kW)
Rs value (%)
75
1.5 – 2
150
1 – 1.5
300
0.6 – 1.2
450
0.35 – 0.7
630
0.25 – 0.5
Note:
If this value is set too high then increased motor currents can
reach the current limit (G10.5) preventing further acceleration to the
motor. We recommend consulting the above standard value table as
Rs value is variable according to the drive capacity.
YES
