AMD5x Passive Infeed Unit and AMD5x Servo Drive - User Guide
ANCA MOTION
D-000129 Rev 09
80
exponential decay of time constant
t
= 36 x 1,515 = 55ms.The equivalent rectangular power (18kW) pulse has
duration of
t
/2 = 27ms.
If in Example 1 three capacitor modules were added to the AMD5x system, then total bus capacitance = 7,860µF
and thus E
C
= 1418J. Since the capacitor energy is greater than kinetic energy, no energy will be dissipated into
the brake resistor. This can present considerable energy cost savings, and the resistor wattage rating is much
lower.
With three capacitor modules, the brake resistor must be able to dissipate E
C
=½ C V
2
M
= 2553J when the PIU
bus is discharged during a shut down.
With a 36Ω Brake Resistor, the resistor and total capacitance discharges
with exponential decay of time constant
t
= 36 x 7860 = 283ms which equates to a rectangular power pulse of
18kW for duration of
t
/2 = 141ms. The brake resistor must have an energy rating greater than this single
discharge pulse. The three capacitor modules require the brake resistor to have minimal wattage rating, but
higher pulse power rating.
5.10
DC Busbar and PE Terminals
Danger
– High Voltage Area:
If you require access to the Busbar screw terminals ensure that the DC Bus
capacitors have been fully discharged. Refer to the Product Rating Sticker on the side of the drive for further
information. Refer
The AMD5x PIU and Drives utilise a common DC Bus where power is supplied from the PIU and distributed to all
Drives connected on the same bus. The Protective Earth bus runs parallel to the DC Bus and uses the same
busbars to connect between Drives and PIU.
Longer Busbars are supplied with “Wide” Drives (the 35A and
35AH).
Warning:
The M4 nuts holding the busbars must be tightend to 1.5Nm
Warning:
Ensure all busbars are installed before applying mains power to the AMD5x system.
5.11
Checking the Insulation of the Assembly
The Installed three-phase supply and motor cables must be tested for functioning insulation according to local
regulations by using an insulation resistance tester at 500Vdc.
The AMD5x PIU and Drives have internal voltage surge suppression components fitted to reduce EMI originating
from switching of high power internal components. When carrying out an insulation resistance test
(megohmmeter) on an installation in which the AMD5x PIU and Drive is fitted, the internal voltage surge
suppression components may cause the test to fail, and potentially damage the PIU and/or Drive. To
accommodate the insulation resistance test, the cables
must
be disconnected from the PIU and Drive, before the
insulation resistance test is carried out on the cables.
The cables to be disconnected are: three-phase supply (X2 on PIU), regenerative brake resistor connector (X1
on PIU) and motor connector (X11 on Drive).
Checking the Regenerative Brake Resistor Insulation
5.11.1
The resistor must be disconnected from X1 on the PIU and mounted in the electrical cabinet.
The external regeneration resistor must be tested for functioning insulation according to local regulations by using
an insulation resistance tester at 1000V. Both resistor leads must have an insulation resistance greater than 1
MegOhm to the Protective Earth conductor. A test should also be carried out to ensure that the resistance of the
regeneration resistor is as expected.
Summary of Contents for AMD5x Series
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