Technosoft IDM240-5EI Technical Reference page 41

WARNING!
CAUTION!
3.2.3.3 Recommendations for Supply Wiring
1. Use short, thick wires between the IDMx40 and the motor power supply. If the wires are
longer than 2 meters, use twisted wires for the supply and ground return. For wires longer
than 20 meters, add a capacitor of at least 1,000 μF (rated at an appropriate voltage) right on
the terminals of the IDMx40.
2. When the same motor power supply is used for multiple drives, do a "star" connection
centered (electrically) around the supply outputs. Connect each drive to the common motor
supply using separate wires for plus and return.
3. Always connect the IDMx40 earth / shield pin to a good quality earth point. The IDMx40
generates electromagnetic disturbances when it's case is not grounded. Use a short and thick
connection from the earth pin of the drive to the earth point. Whenever possible, mount the
IDMx40 drive on a metallic surface connected to earth. For mechanical fixing, use good
quality plated screws that won't oxidize during the expected lifetime.
3.2.3.4 Recommendations to limit over-voltage during braking
During abrupt motion brakes or reversals the regenerative energy is injected into the motor power
supply. This may cause an increase of the motor supply voltage (depending on the power supply
characteristics). If the voltage bypasses U
the drive power stage is disabled. In order to avoid this situation you have 2 options:
Option 1. Add a capacitor on the motor supply big enough to absorb the overall energy flowing
back to the supply. The capacitor must be rated to a voltage equal or bigger than the maximum
expected over-voltage and can be sized with the formula:
where:
U = 63V (IDM240) / 92V (IDM640) is the over-voltage protection limit
MAX
C = 100μF (IDM240) / 200μF (IDM640) is the drive internal capacitance
Drive
U = 48V (IDM240) / 80V (IDM640) is nominal motor supply voltage
NOM
© Technosoft 2011
ALWAYS PROVIDE AN EXTERNAL MEAN TO SWITCH
OFF THE POWER SUPPLIES! ALWAYS TURN OFF
SUPPLIES BEFORE INSTALLING THE DRIVE
ALWAYS LIMIT THE IN-RUSH (START-UP) CURRENT OF
THE MOTOR SUPPLY, OTHERWISE IT CAN DAMAGE THE
DRIVE
, the drive over-voltage protection is triggered and
MAX
×
2
≥
C
2
−
U
MAX
30
E
M
−
C
Drive
2
U
NOM
IDMx40 Technical Reference