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A single large Inverter can be used to supply several smaller motors provided that each
individual motor has overload protection.
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#51
The Inverter must be rated to supply the total
motor current. It is not sufficient to simply sum
the power ratings of the motors, since the Inverter
has also to supply the magnetising current for each
motor.
Note that the overload device will not prevent the
motor overheating due to inadequate cooling at low
speed. Force vented motors may be required;
consult your motor supplier.
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During deceleration, or with
an overhauling load, the
motor acts as a generator.
Energy flows back from the
motor into the dc link
capacitors within the drive.
This causes the dc link
voltage to rise. If the dc link
voltage exceeds 810V for
the 400V build (or 420V for
the 230V build) then the
drive will trip to protect the
capacitors and the Inverter
power devices. The amount
of energy that can be
absorbed in the capacitors is
relatively small; typically
more than 20% braking
M1
M2
584SV
OL1
OL2
M1/U M2/V M3/W
Figure 13-1 Single Inverter supplying
multiple Motors
GATE
DRIVE
CIRCUIT
+
EXTERNAL
RESISTOR
NETWORK
Figure 13-2 Dynamic Braking Circuit
Содержание 584SV Series
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