Chapter 3 Start Up
VFD-E Series
Revision August 2006, 01EE, SW--PW V1.03/CTL V2.03 2-13
With long motor cables, high capacitive switching current peaks can cause over-current,
high leakage current or lower current readout accuracy. To prevent this, the motor cable
should be less than 20m for 3.7kW models and below. And the cable should be less
than 50m for 5.5kW models and above. For longer motor cables use an AC output
reactor.
Use a well-insulated motor, suitable for inverter operation.
Terminals [+/B1, B2] for connecting brake resistor
B2
BUE
-(minus sign)
BR
BR
Connect a brake resistor or brake unit in applications with frequent deceleration ramps,
short deceleration time, too low braking torque or requiring increased braking torque.
If the AC motor drive has a built-in brake chopper (frame B and frame C), connect the
external brake resistor to the terminals [+/B1, B2].
Models of frame A don’t have a built-in brake chopper. Please connect an external
optional brake unit (BUE-series) and brake resistor. Refer to BUE series user manual for
details.
Connect the terminals [+(P), -(N)] of the brake unit to the AC motor drive terminals [+/B1,
-]. The length of wiring should be less than 5m with twisted cable.
When not used, please leave the terminals [+/B1, -] open.
WARNING!
Short-circuiting [B2] or [-] to [+/B1] can damage the AC motor drive.
Grounding terminals (
)
Make sure that the leads are connected correctly and the AC drive is properly grounded.
(Ground resistance should not exceed 0.1
Ө
.)
Use ground leads that comply with local regulations and keep them as short as possible.
Multiple VFD-E units can be installed in one location. All the units should be grounded
directly to a common ground terminal, as shown in the figure below. Ensure there are
no ground loops.
goodexcellent
not allowed
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