Phase AxN series, Installation Manual

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Resistance
The selection of the external brake resistor resistance must be proper. If the resistance is smaller
than Minimum Resistance, the IGBT might be damaged by the overload brake current. And if the
resistance is bigger than Maximum Resistance, the brake procedure might be abort because of the
high DC-Bus Voltage (over 900V).
Refer to following table to check the Minimum and Maximum Resistance of external brake resistor
which is suitable for a particular drive:
AxN Size5 Minimum Resistance (Ω) Maximum Resistance (Ω)
AxN 90.150.4 2 3.7
AxN 110.200.4 2 2.7
Maximum Absorb Energy and Maximum Power
Maximum Absorb Energy and Maximum Power are two important factors to evaluate the energy
absorption ability of the brake resistor. The values of these two factors may differ from one
application to another, but the basic idea is always the same, to dissipate the required power to
decelerate the load in desired time.
NOTE: Brake resistor wires’ insulation grade must be higher than 1000Vac and 3000Vdc.
2.3.4 External Brake Resistor Installation
Step 1: Check the Brake Resistor
Check the external brake resistor’s resistance, maximum absorb energy and maximum power.
Make sure that the brake resistor is suitable for AxN Size5 Drive and real application.
Step 2: Fabricate Brake Resistor Wires
In order to install the brake resistor to AxN Size5 Drive, the brake’s wire should be clamped ring
terminals to fit the terminals on drive. AxN Size5 series drives are recommended to use the RNY
series Ring Terminals manufactured by KST. And the recommended strip length is 14mm. Refer to
following figure and table for more detail.
Ring Terminal d2 (mm) W (mm) F (mm) E (mm) D (mm) d1 (mm)
RNYB 22-8 8.4 16.5 13.5 24 13 7.7
Step 3: Find out the External Brake Resistor Terminals
DC+ and Brk-, these are the two terminals called External Brake Resistor Terminals. AxN Size5
Drive’s Internal Brake Resistor Terminals are in the Power Supply Input Port (P1) which is on the