English
5. OPERATING MODES
G85139-H1751-U529-D1
© Siemens plc 1999
4/8/99
38
For example:
P386 = Load i motor shaft inertia
motor shaft inertia
P387, the integral term, may now be adjusted. Again, whilst operating the inverter under typical conditions,
increment this parameter until the first signs of speed instability occur. The setting should then be reduced slightly
(approx. 30%) until stability is restored.
If fault code F016 occurs, this indicates that SVC is unstable and further adjustment or recalibration is needed. F001, DC link
overvoltage can also be caused by instability in SVC operating mode.
For further information concerning SVC operation refer to Application Note “Sensorless Vector Control”, which may be obtained from
http://www.siemens.com/micromaster
or a Siemens Sales Office.
Note: This mode gives the best flux control and higher torque.
5.4 Stopping the Motor
Stopping can be achieved in several ways:
·
Cancelling the ON command on the terminals or pressing the OFF button (
O
) on the front panel causes the inverter to Ramp-down
at the selected Ramp-down rate
(see P003)
.
·
OFF2 - operation causes the motor to coast to a standstill
(parameters P051 to P055 or P356 set to 4)
.
·
OFF3 - operation causes rapid braking
(parameters P051 to P055 or P356 set to 5)
.
·
DC injection braking up to 250% produces more effective braking to provide a quicker stop after cancellation of the ON command
(see P073)
.
·
Resistive braking for MMV
(see parameter P075)
.
·
Compound braking (
see P066
)
5.5 If the Motor Does Not Start Up
If the display shows a fault code, refer to section 7.
If the motor does not start up when the ON command has been given, check that the ON command is valid, check if a frequency
setpoint has been entered in P005 and check that the motor specifications have been entered correctly under parameters P080 to
P085.
If the inverter is configured for operation via the front panel (P007 = 001) and the motor does not start when the RUN button is pressed,
check that P121 = 001 (RUN button enabled).
If the motor does not run after parameters have been changed accidentally, reset the inverter to the factory default parameter values by
setting parameter
P944
to
1
and then pressing
P
.
5.6 Local and Remote Control
The inverter can be controlled either locally (default), or remotely via a USS data line connected to the internal interface terminals (24
and 25) or to the RS485 D-type connector on the front panel. (Refer to
parameter P910 in section 6 for the available remote control
options.)
When local control is used, the inverter can only be controlled via the front panel or the control terminals. Control commands, setpoints
or parameter changes received via the RS485 interface have no effect.
For remote control, the serial interface is designed as a 2-wire connection for bi-directional data transmission. Refer to
parameter P910
in section 6 for the available remote control options.
Note:
Only one RS485 connection is allowed. Use either the front panel D-type interface [e.g. to connect an Clear Text
Display(OPM2)] or terminals 24 and 25,
but not both
.
When operating via remote control the inverter will not accept control commands from the terminals.
Exception: OFF2 or OFF3 can be
activated via parameters P051 to P055 and P356 (see section 6).
