Energy Absorption - Copley Controls Accelnet Plus Dual-Axis Panel EtherCAT Manual

Accelnet
+HV PoWer SuPPly requIremenTS
Regulated Power Supplies
• must be over-voltage protected to 100 Vdc max when the STo (Safe Torque off)
feature of the drive is used.
• require a diode and external capacitor to absorb regenerative energy.
• The Va rating should be greater than the actual continuous output power of the
drives connected to the power supply, and adequate for the transient output
power due to acceleration of motor loads.
• Must handle the internal capacitance of the drives on startup.
Unregulated Power Supplies
• no-load, high-line output voltage must not exceed 90 Vdc.
• Power supply internal capacitance adds to the drive's internal capacitance
for absorption of regenerative energy.
• The Va (Volts & amps) rating at the power supply's aC input is typically 30~40%
greater than the total output power of the drives.
auxIlIary HV PoWer
• aux HV is power that can keep the drive communications and feedback circuits active
when the PWm output stage has been disabled by removing the main +HV supply.
• useful during emo (emergency off) conditions where the +HV supply must be
removed from the drive and powered-down to ensure operator safety.
• Voltage range is the same as +HV.
• Powers the dC/dC converter that supplies operating voltages to the drive dSP and
control circuits.
• aux HV draws no current when the +HV voltage is greater than the aux HV voltage.
moTor ConneCTIonS
• Motor cable shield connects to motor frame,
is grounded with a P-clip near the drive and
terminates in a ring-lug that is screwed to
the drive chassis by a mounting screw to the
panel
• If provided, a green/yellow grounding wire
from the motor connects to the f.G. terminal
of the motor connector.
feedBaCK ConneCTIonS
• Cable shield connects to motor frame and to
the f.G. terminal of the feedback connector.
• When double-shielding is used, the inner
shields connect to the Signal Ground at the
drive, and is not connected at the motor end.
• If not provided by the motor manufacturer,
feedback cables rated for RS-422
communications are recommended for digital
encoders.
reGeneraTIon
This chart shows the energy absorption in
W·s for the drive operating at some typical
dC voltages. It is based on the internal 470
uF capacitor and would be increased by the
capacitance of the external DC power supply.
When the load mechanical energy is greater
than these values an external regenerative
energy dissipater is required, or the dC power
supply capacitance can be increased to absorb
the regen energy.
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
Web: www.copleycontrols.com
Plus
2-Axis Panel EtherCAT
Feedback
{
Enc A
{
Enc B
{
Enc X
Sgnd
F.G.
Motor
U
V
W
F.G.
enerGy
aBSorPTIon
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
25 30 40
(+)
Regulated
Power
Supply
(-)
C
ext: External
Capacitor
Unregulated
Power
Supply
C
ps
Cps
: Power Supply
Capacitor
Inner Shields
Outer Shield
P-clip
50 60 70 80 90
Tel: 781-828-8090
BE2
RoHS
Drive
+ +
C C
ext int
C
int: Internal
Capacitor
(+)
Drive
+
+
C
int
(-)
C
int: Internal
Capacitor
Encoder
Motor
Earth
Ground
Frame
Ground
Fax: 781-828-6547
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