Chapter 5 Parameter Introductions
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171
Formula used for calculating resistance (resistance of stator or rotor)
()
%100
3/
% ×
⋅
=
IV
R
R
Formula used for calculating inductance (leakage inductance or mutual inductance):
()
%100
3/
% ×
⋅
=
IV
X
X
If motor parameters are known, please set PA.04 ~PA.07 to the values calculated
according to the above formulas.
After motor power (PA.01) change, the ac drive will change PA.02~PA.08 according
to the ac motor power.
PA.08 Rated Speed
Range: 0～24000 rpm【This value depends on the ac drive
model】
Note:
◆Motor rated speed is used to calculate the value of slip compensation. About the slip
compensation function, please refer to P9.00, P9.01 for details.
5.12 MODBUS Communication (Group Pb)
ALPHA 6000 can perform MODBUS communication with a programmable controller
(PLC). The MODBUS network is composed of a master PLC and 1 to 31 (maximum)
slave ac drives. The master always sends message to slave and the slave responds to
master.
The master can send a message to an addressed slave unit at a time.
Therefore, address numbers are assigned to each slave unit in advance and the master
unit specifies a number to perform signal transmission. The slave unit, which receives
the command from the master unit, executes the function and returns the response to the
master unit.
◆Communication Specifications
Interface: RS-485
Synchronization: Half-duplex asynchronous.
◆Transmission parameters:
Baud rate: Selectable from 1200, 2400, 4800, 9600, 19200, 38400 BPS (parameter
Pb.00)
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