Copley Controls XM2-230-20, Instruction

Page: 32 / 34

Vac E
100 155
120 145
200 85
240 43
Max Energy 100 W·s (J)
Resistance 18 W
Power, continuous 20 W
Power, peak 70 W
time 2000 ms
Velocity
Bus
Vdc
HVdc
390
Off
Active
Regen
Resistor
Absorption
Decel time
Regen time
Velocity
Bus
Voltage
Regen
Active Regen
Dwell Time
Regen
Cycle Time
RoHS
Xenus
PLUS
2-Axis
MACRO
XM2
Rev 01
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
16-01419 Rev A Page 32 of 34
regeneratIon
The drive has has an internal regen resistor which can handle regenerative energy that exceeds the absorption capacity of the
internal bus capacitance. the internal regen resistor will be switched on when the energy shown in the table has been absorbed
and the bus voltage driven up to 390 Vdc at which point the internal regen resistor will be switched to absorb the kinetic energy
of the load.
ABSoRPtion
INTERNAl REGEN RESISTOR
CAlCUlATING THE REGEN REPETITION FREQUENCy
Step 2: Subtract the absorption at your mains voltage to get the energy that must
be dissipated in the regen resistor. Use 240 Vac:
75J - 43J = 32 J
Step 3: Divide the regen energy by the continuous power rating of 20 Watts
to get the dwell time that can dissipate the regen energy in the resistor:
Dwell Time = 32 Joules = 1.6 sec
20 Watts
Step 4: Find the total regen cycle time by adding the deceleration time
to the dwell time:
Decel Time = 1.25 sec
Dwell Time = 1.60 sec
Cycle Time = 2.85 sec
Step 1: Find the energy of motion for a rotating load, for this example let it be
75 Joules:
E = J * RPM
2
= 75 J
182
Joules; kg·m
2
, RPM
Seconds; Joules, Watts
Joules; Joules
Absorption is the energy that can be transferred to the
internal capacitors during deceleration. this table shows
the energy absorption in W·s for a drive operating at some
typical mains voltages. The capacitor bank is 2350 uF and
the energy absorption is shared with both axes.
if the deceleration energy is less than the absorption
capacity of the drive, then a regeneration resistor will not
be used because the bus voltage will not rise enough to hit
the over-voltage level that would disable the PWM outputs.
terms:
E
Energy Joules, Watt·seconds
J Rotary Moment of Inertia kg·m
2
P Power Watts