DRV-28 inverter
s Optional peripheral accessories
-334-
brake usage. You can select the brake system based on the actual operation conditions.
3.
When using an external brake unit, set the brake voltage class of the brake unit properly by
referring to the manual of the dynamic brake unit. If the voltage class is set incorrectly, the
inverter may not run properly.
Do not use brake resistors whose resistance is lower than the specified
minimum resistance. Inverters do not provide protection against overcurrent
caused by resistors with low resistance.
In scenarios where brake is frequently implemented, that is, the brake usage
is greater than 10%, you need to select a brake resistor with higher power as
required by the operation conditions according to the preceding table.
D.8.2 Brake resistor cable selection
Brake resistor cables need to be shielded cables.
D.8.3 Brake resistor installation
All resistors need to be installed in places with good cooling conditions.
The materials near the brake resistor or brake unit must be non-flammable.
The surface temperature of the resistor is high. Air flowing from the resistor is
of hundreds of degrees Celsius. Prevent any materials from coming into
contact with the resistor.
Installation of brake resistors
Inverters of 400V, 37 kW or lower need only external brake resistors.
PB and (+) are the terminals for connecting brake resistors.
Installation of brake units
(+) and (-) are the terminals for connecting brake units.
The connection cables between the (+) and (-) terminals of an inverter and
those of a brake unit must be shorter than 5 m, and the connection cables
between the BR1 and BR2 terminals of a brake unit and the terminals of a
brake resistor must be shorter than 10 m.
The following figure shows the connection of one inverter to a dynamic brake unit.
