Hitachi S1 Series Basic Manual page 230

S1 series standard inverter
Inverter model
S1-00320HFEF
S1-00380HFEF
S1-00450HFEF
S1-00600HFEF
S1-00750HFEF
S1-00920HFEF
Note:
1. Select brake resistors according to the resistance and power data provided by our company.
2. The brake resistor may increase the brake torque of the inverter. The preceding table describes
the resistance and power for 100% brake torque, 10% brake usage, 50% brake usage, and 80%
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.


12.8.2 Brake resistor cable selection
Brake resistor cables need to be shielded cables.
12.8.3 Brake resistor installation
All resistors need to be installed in places with good cooling conditions.

Installation of brake resistors


Resistance
applicable
Brake unit
for 100%
model
torque (Ω)
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.
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.
Inverters (37 kW or lower) need only external brake resistors.
PB and (+) are the terminals for connecting brake resistors.
Dissipated
power of
brake
resistor
(kW)
brake
10% brake
usage
44 1.7
32 2
27 3
22 3
17 5
13 6
-225-
Dissipated Dissipated
power of power of
brake brake
resistor resistor
(kW) (kW)
50% brake 80% brake
usage usage
8.3 13.2
11 18
14 22
17 26
23 36
28 44
Min.
allowable
brake
resistance
(Ω)
31
23
19
17
17
11.7