Servotronix CDHD2S - Page 97

Drive Setup
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EM = Total energy consumed by the amplifier (J)
C=Bus module capacitance (F); please refer to the Bus Specifications section
VHigh = Hysteresis point: the regenerative circuit is turned on (V); please refer to the Bus
Specifications section.
VLow = Hysteresis point: the regenerative circuit is closed (V); please refer to the Bus
Specifications section.
tcycle = Deceleration interval+deceleration time (s)
Determine the resistor power for peak
Regen
2
M
PK
R
V
=P
RRegen = Regenerative resistor resistance (ΩL-L)
VM = Maximum bus voltage (v); please refer to the Bus Specifications section.
Example for the calculation of regenerative resistor resistance (in US standard units)
Motor and drive specifications
CDHD2S-006 drive, using single-phase AC voltage 240V input
Jmotor=0.000484lb·ft·sec2
RM=1.32Ω
Ipeak=18A
TM=19.8lb∙ft
C=0.001120F
VM=420V
KB=81.2V/krpm=0.0812V/rpm
kt=1.188lb·ft/A
System specifications
Tf=1.5lb∙ft
JLoad=0.0015lb·ft·sec2
VMax=2,500rpm=>ωM=261rad/s
VNOM=240Vrms=340VDC
Deceleration interval=5s
Calculation of deceleration time
( ) ( ) ( )
s 0.0181
)T+(T
)ω ()J+(J
t
fM
MLoadMotor
d
=++=

= 5.18.19/261001.0000484.0