6. SYSTEM PARAMETERS
English
Parameter Function
Range
[Default]
Description / Notes
© Siemens plc 1999
G85139-H1751-U529-D1
53
4/8/99
P071
·
Slip compensation (%)
0 - 200
[0]
The inverter can estimate the amount of slip in an asynchronous motor at
varying loads and increase its output frequency to compensate. This parameter
‘fine tunes’ the compensation for different motors in the range 0 - 200% of the
calculated slip.
Note:
This feature is not active and is not necessary when inSensorless
Vector Control (P077=3).
WARNING:
This parameter must be set to zero when using
synchronous motors or motors that are connected in
parallel or over-compensation can cause instability.
P072
·
Slip limit (%)
0 - 500
[250]
0 - 499 -
This limits the slip of the motor to prevent ‘pull-out’ (stalling), which
can occur if slip is allowed to increase indefinitely. When the slip
limit is reached, the inverter reduces frequency to keep the level of
slip below this limit.
500 - Disables slip limit warning
P073
·
DC injection braking (%)
0 - 200
[0]
This rapidly stops the motor by applying a DC braking current and holds the
shaft stationary until the end of the braking period. Additional heat is generated
within the motor. Braking is effective for the period of time set by P003.
The DC brake can be activated using DIN1 to DIN6
(see P051 to P055 and
P356)
.
WARNING:
Frequent use of long periods of dc injection braking can
cause the motor to overheat.
If DC injection braking is enabled via a digital input then
DC current is applied for as long as the digital input is
high. This causes heating of the motor.
