5. SYSTEM PARAMETERS
English
Parameter Function
Range
[Default]
Description / Notes
© Siemens plc 1999
G85139-H1750-U049-C1
35
19/08/99
P086
••••
Motor current limit (%)
0 - 250
[0]
Defines the motor overload current as a % of the Nominal motor
current (P083) allowed for up to one minute.
With this parameter the motor current can be limited and overheating of
the motor prevented. If the value set in P083 is exceeded for one
minute, (or longer if the overload is small) the output frequency is
reduced until the current falls to that set in P083. The inverter display
flashes as a warning indication but the inverter does not trip. The
inverter can be made to trip using P074.
Note:
The maximum value that P086 can be set to is automatically
limited by the rating of the inverter.
Note:
When P086 is set to 0, the current limit settings in P083 and
P086 are inoperative, the inverter and motor are protected by a fixed
internal limit . Additional overload protection is still offered by P074.
Note: If a value other than the default value of 0 is entered in
P086, this must not be smaller than the sum of the values entered
in parameters P078 and P079 (continuous and staring boost
respectively). Any value lower than this sum will cause the inverter
to go into current limitation.
P089
••••
Stator resistance (
Ω
)
0.01-
100.00
[
]
The stator resistance of the motor should be entered in this parameter.
The value entered should be the resistance between any two phases
with the motor connected.
The measurement should be made at the
inverter output terminals with power off.
Note:
If the value of P089 is too high then an overcurrent trip
(F002) may occur.
P091
••••
Serial link slave address
0 - 30
[0]
Up to 31 inverters can be connected via the serial link and controlled
by a computer or PLC using the USS protocol. This parameter sets a
unique address for the inverter.
P092
••••
Serial link baud rate
3 - 7
[6]
Sets the baud rate of the RS485 serial interface (USS protocol):
3
= 1200 baud
4
= 2400 baud
5
= 4800 baud
6
= 9600 baud
7
= 19200 baud
Note:
Some RS232 to RS485 converters are not capable of
baud rates higher than 4800.
P093
••••
Serial link timeout (seconds)
0 - 240
[0]
This is the maximum permissible period between two incoming data
telegrams. This feature is used to turn off the inverter in the event of a
communications failure.
Timing starts after a valid data telegram has been received and if a
further data telegram is not received within the specified time period,
the inverter will trip and display fault code F008.
Setting the value to zero switches off the control.
P094
••••
Serial link nominal system setpoint
(Hz)
0 - 400.00
[50.00]
Setpoints are transmitted to the inverter via the serial link as
percentages. The value entered in this parameter represents 100%
(HSW = 4000H).
P095
••••
USS compatibility
0 - 2
[0]
0
= Compatible with 0.1 Hz resolution
1
= Enable 0.01 Hz resolution
2
= HSW is not scaled but represents the actual frequency value to
a resolution of 0.01 Hz (e.g. 5000 = 50 Hz).
P099
••••
Option module type
0 - 2
[0]
0
= Option module not present
1
= PROFIBUS module (enables parameters relating to PROFIBUS)
2
= CANbus module (enables parameters relating to CANbus)
