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5. SYSTEM PARAMETERS
Parameter Function
Range
[Default]
Description / Notes
G85139-H1750-U049-C1
© Siemens plc 1999
19/08/99
34
Model
P076 =
0
or
1
2
or
3
MM37/3- MM750/3
50%xP083
80%xP083
MM220/3F- MM750/3F
50%xP083
80%xP083
P077
Control mode
0 - 2
[1]
Controls the relationship between the speed of the motor and the
voltage supplied by the inverter. One of two modes can be selected:
0/1
= Linear voltage/frequency
Use this curve for synchronous motors or motors connected
in parallel.
2
=
Quadratic voltage/frequency relationship
This is suitable for centrifugal pumps and fans.
P078
••••
Continuous boost (%)
0 - 250
[100]
Operates continuously over the whole frequency range.
For many applications it is necessary to increase low frequency torque.
This parameter sets the start-up voltage at 0 Hz to adjust the available
torque for low frequency operation. 100% setting will produce rated
motor current at low frequencies.
WARNING:
If P078 is set too high, overheating of the motor
and/or an overcurrent trip (F002) can occur.
P079
••••
Starting boost (%)
0 - 250
[0]
For drives which require a high initial starting torque, it is possible to
set an additional current (added to the setting in P078) during ramping.
This is only effective during initial start up and until the frequency
setpoint is reached.
WARNING:
This increase is in addition to P078, but the total is
limited to 250%.
P081
Nominal frequency for motor (Hz)
0 - 400.00
[50.00]
P082
Nominal speed for motor (RPM)
0 - 9999
[
]
These parameters must be set for the motor used.
P083
Nominal current for motor (A)
0.1 - 99.9
[
]
Read the specifications on the motor rating plate
(see section 3.2.1)
.
P084
Nominal voltage for motor (V)
0 - 1000
[
]
Note:
The inverter’s default setting vary according to the power rating.
P085
Nominal power for motor (kW/hp)
0 - 100.0
[
]
V
N
(P084)
f
N
(P081)
V
N
f
0/1
2
V
max
