D.8.2 Selecting The Brake Resistor Cables - INVT Goodrive35 Series Operation Manual

Goodrive35 Series Closed-loop Vector Control VFD
 Do not use brake resistors whose resistance is lower than the specified minimum
resistance. VFDs 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 Selecting the brake resistor cables

Brake resistor cables need to be shielded cables.
D.8.3 Installing the brake resistor
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 the brake resistor:
 VFDs of 380 V, 37 kW or lower need only external brake resistors.
 PB and (+) are the terminals for connecting brake resistors.
Installation of brake units:
The following figure shows the connection of one VFD to a dynamic brake unit.
Goodrive35
 The VFDs of 380 V (≥37 kW) need external brake units.
 The VFDs of 660 V need external brake units.
 (+), (-) are the terminals for connecting brake units.
 The connection cables between the (+) and (-) terminals of a VFD 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.
+
External
brake
resistor
PB
288
Optional peripheral accessories