Dynamic Braking (DB) Selection
General Procedure
Use the following steps for proper selection of dynamic braking hardware:
1.
Calculate the watts to be dissipated per the formulas to follow.
2.
Identify the middle number of the controller and determine which dynamic brake hardware is
required based on the model number suffix (-E, -ER).
3
Select the required hardware from the Baldor Electric Company 501 catalog or from the
hardware listings that follow.
Sizing Procedure
For either general machinery or hoisting applications, the same sizing procedure (with different
formulas) is used:
1.
Determine TDEC (Deceleration Torque or weight to be lowered)
2.
Determine D r (Dynamic Braking Duty Cycle)
3.
Determine W r (Regenerated Watts)
4.
Use External Dynamic Brake Resistor Assemblies Table to select the part number for braking
hardware.
General Machinery
To determine deceleration torque, use the formula:
Where:
T
DEC
= deceleration torque in lb-ft
∆
RPM
= change in speed
WK
2
= inertia in lb-ft
2
t
= seconds
Hoisting Applications:
To determine hoist braking duty cycle use the formula:
Where:
Dr
= duty cycle
LT
= lowering time
TCT
= total cycle time
2-14 INSTALLATION
∆
RPM x WK
2
308 x t
T
DEC
=
LT
TCT
Dr =
MN723H-10/95 11/28/95 1:09 AM Page 26 (Black plate)
Summary of Contents for 23H Series
Page 11: ...1 8 GENERAL INFORMATION MN723H 10 95 11 28 95 1 07 AM Page 12 Black plate...
Page 83: ...3 30 KEYPAD PROGRAMMING AND OPERATION MN723H 10 95 11 28 95 1 13 AM Page 84 Black plate...
Page 99: ...4 16 DIAGNOSTIC INFO AND TROUBLESHOOTING MN723H 10 95 11 28 95 1 14 AM Page 100 Black plate...
Page 125: ...5 26 APPENDIX G MN723H 10 95 11 28 95 1 21 AM Page 126 Black plate...
Page 126: ...MN723H 10 95 11 28 95 1 21 AM Page 127 Black plate...
