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Parameter
Function
P077
Control mode
P078 • • • •
Continuous boost (%)
P079 • • • •
Starting boost (%)
P081
Nominal frequency for motor (Hz)
P082
Nominal speed for motor (RPM)
P083
Nominal current for motor (A)
P084
Nominal voltage for motor (V)
P085
Nominal power for motor (kW/hp)
G85139-H1750-U049-C1
19/08/99
Range
Description / Notes
[Default]
Model
MM37/3- MM750/3
MM220/3F- MM750/3F
0 - 2
Controls the relationship between the speed of the motor and the
[1]
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.
V
N
V
max
V
(P084)
N
0 - 250
Operates continuously over the whole frequency range.
[100]
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:
0 - 250
For drives which require a high initial starting torque, it is possible to
[0]
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:
limited to 250%.
0 - 400.00
[50.00]
0 - 9999
[
]
These parameters must be set for the motor used.
0.1 - 99.9
Read the specifications on the motor rating plate (see section 3.2.1).
[
]
0 - 1000
Note: The inverter's default setting vary according to the power rating.
[
]
0 - 100.0
[
]
34
5. SYSTEM PARAMETERS
P076 =
0 or 1
50%xP083
80%xP083
50%xP083
80%xP083
0/1
2
f
(P081)
N
If P078 is set too high, overheating of the motor
and/or an overcurrent trip (F002) can occur.
This increase is in addition to P078, but the total is
2 or 3
f
© Siemens plc 1999
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