Selection criteria
5.
S
E
LECT
ING CRI
T
ERIA
Ballast resistor selection
guide
· 198 ·
198
Ref.2003
QC-PDS
HARDWARE
5.7
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 (mass of the mobile elements of
the motor and mechanics) with regard to the rotation axis 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 the braking, given by the maximum
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 QC-PDS
Page 1: ...DRIVE QC PDS Hardware manual Ref 2003...
Page 6: ...6 I 6 Ref 2003 6 QC PDS HARDWARE This page intentionally left blank...
Page 16: ...16 Ref 2003 16 Previous I QC PDS HARDWARE This page intentionally left blank...
Page 18: ...18 Ref 2003 18 Previous II QC PDS HARDWARE This page intentionally left blank...
Page 80: ...2 POWER SUPPLIES Power supplies 80 Ref 2003 QC PDS HARDWARE...
Page 138: ...3 DRIVES Drives 138 Ref 2003 QC PDS HARDWARE...
Page 174: ...4 AUXILIARY MODULES Auxiliary modules Ref 2003 174 QC PDS HARDWARE...
Page 302: ...8 INSTALLATION Installation Ref 2003 302 QC PDS HARDWARE...
Page 366: ...12 COMMERCIAL MODELS Commercial models Ref 2003 QC PDS HARDWARE 366...
Page 367: ...ANNEXES...
Page 368: ...ANNEX A1...
Page 383: ...ANNEX A2...
Page 398: ...ANNEX A3...
Page 418: ......
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