Selection criteria
S
E
LECT
ING CRI
T
ERIA
Ballast
resistor selection
guide
5.
229
DDS
HARDWARE
Ref.1310
5.6 Ballast resistor selection guide
Calculate the value of:
Based on the following formulae:
where:
Wm
Energy generated by the braking of each system motor.
Pe
Rms power generated by all braking of all the motors
throughout a complete duty cycle.
Jt
Total inertia of the servo system (motor + mechanics) in kg.m².
n
Turning speed of the motor when the braking starts in rpm.
Wmi
Energy of each braking during a cycle of time T in Ws.
Wp
Potential energy lost by the machine mass while braking (only on
non-compensated axes) in Ws.
ti
Braking time (in seconds) when the Wmi energy is generated.
T
Time (in seconds) in a full cycle.
Dh
Height (in m) lost while braking.
Wmx
Maximum energy among all the Wm.
Pmx
Maximum power generated by all the braking, given by the maxi-
mum value among all the (Wmi / ti) quotients of each braking in kW.
Wm
Wp
1
2
---
+
Jt
2
n
60
--------------
2
Ws
=
Wp m g
h
=
Pe
Wmi
2
ti
------------
i
T
---------------------
w
=
Pmx
Wmi
ti
------------
max
kW
=
Summary of Contents for APS-24
Page 1: ...DRIVE DDS Hardware manual Ref 1310...
Page 6: ...I 6 DDS HARDWARE Ref 1310...
Page 9: ......
Page 10: ......
Page 11: ......
Page 12: ......
Page 16: ...16 Ref 1310 DDS HARDWARE...
Page 30: ...1 DESCRIPTION 30 Description DDS HARDWARE Ref 1310...
Page 94: ...2 POWER SUPPLIES 94 Power supplies DDS HARDWARE Ref 1310...
Page 188: ...3 DRIVE MODULES 188 Drive modules DDS HARDWARE Ref 1310...
Page 204: ...4 AUXILIARY MODULES 204 Auxiliary modules DDS HARDWARE Ref 1310...
Page 232: ...SELECTING CRITERIA 5 232 Selection criteria DDS HARDWARE Ref 1310...
Page 266: ...7 CABLES 266 Cables DDS HARDWARE Ref 1310...
Page 312: ...8 INSTALLATION 312 Installation DDS HARDWARE Ref 1310...
Page 326: ...9 FUNCTIONAL SAFETY 326 Functional safety DDS HARDWARE Ref 1310...
Page 354: ...10 CONNECTION DIAGRAMS 354 Connection diagrams DDS HARDWARE Ref 1310...
Page 378: ...12 SALES REFERENCES 378 Sales references DDS HARDWARE Ref 1310...
Page 384: ...13 COMPATIBILITY 384 Compatibility DDS HARDWARE Ref 1310...
Page 385: ......