Nidec Answer Drives 1000 Series - Page 119

Summary
Preface P. 6
Chapter 2 P. 17
Technical data
Chapter 5 P. 76
Reception, storage
and installation
Chapter 4 P. 54
General information
Chapter 3 P. 47
Application notes
Chapter 6 P. 115
Options
Chapter 7 P. 129
Preventive maintenance
Chapter 1 P. 15
Overview
and installation diagram
Answer Drives 1000
119
6
Terms and symbols used:
The ohmic value of RB must be greater or equal to the value shown
in Table 6.2.1.
The braking voltage must be selected according to the voltage class
of the drive, as shown in the following table
Table 6.2.3 Braking Voltage for drives voltage class
After calculations the braking resistor can be selected using
the following values:
• ohm value (X),
• braking energy (J)
• working cycle,
• peak voltage to ground 1200 Volt.
AC voltage class of the AD1000 DC voltage to be used in the formula
F
from 380 to 480V
750
6.2.3 RESISTOR SELECTION
MB = braking torque of the motor speed from N1 to N2 in a time tb. Nm
J = total inertia of the motor shaft. Kgm2
ML = load torque to the motor shaft. Nm
PR = resistor average power. W
WB = braking energy. J
MN = Motor rated torque Nm
N = Motor rated speed. RPM
P = Motor rated power. W
V = Rated braking DC voltage (See the values in the table 6.1-3)
NM
X
J
W