EA180 Series Servo Drive Users Manual
18
Built-in braking resistor specifications
Energy handling capacity
of built-in braking resistor
Allowable minimum
external resistance
2.7.2 Calculation of external braking resistor capacity
When the regenerative energy exceeds the handling capacity of the built-in braking resistor
(e.g. alarm Al017 occurs), an external braking resistor should be used.
According to the calculation formula of the regenerative energy, assuming total load inertia is
N times the inertia of the motor rotor, when brake motor is braked from the rated speed to 0,
regenerative energy is N *Eo, the action cycle is T(s), then,
𝑃𝑜𝑤𝑒𝑟 𝑜𝑓 𝑏𝑟𝑎𝑘𝑖𝑛𝑔 𝑟𝑒𝑠𝑖𝑠𝑡𝑜𝑟 =
2
(
𝑁 × 𝐸
0
− 𝐸
𝑐
)
𝑇
2.7.3 Notes for using external braking resistor
When using an external braking resistor, the resistor should be connected to the P + and C terminals of the
drive. At the same time, the short connector installed on the P + and D terminals must be removed to create
an open circuit between the P and D terminals.
The resistance of the external braking resistor cannot be less than that listed in Table 2-2, otherwise the
servo drive may be damaged.
Please correctly set the resistance and capacity of the external braking resistor used into the function
parameters of the drive, otherwise the function will be affected.
P8-10 (braking resistance value), P8-11 (braking resistor power), P8-13 (braking resistor derating
percentage).
In the natural environment, when the braking resistor is used at the rated capacity, the temperature of the
resistor will rise to above 120 ℃ (under the condition of continuous braking). For safety reasons, please use
forced cooling to lower the temperature of braking resistor, or a braking resistor with a thermal switch is
recommended. Please consult the manufacturer about the load characteristics of the brake resistor.
1. The resistance of the external braking resistor cannot be less than that listed
in Table 2-2, otherwise the servo drive may be damaged.
2. When using an external brake resistor, the servo drive will be damaged if the
short connector between P and D is not removed.
2.8 EMI filters
All electronic equipment (including servo drives) will generate high-frequency or low-frequency noise during
normal operation, which will interfere with peripheral equipment by conduction or radiation. The interference
can be minimized if an appropriate EMI filter is used and correctly installed.
If the servo drive and EMI filter can be installed and wired according to the instructions in this Manual, we can
make sure that they meet the following specifications:
1. EN61000-6-4 (2001)
2. EN61800-3 (2004) PDS of category C2
3. EN55011+A2 (2007) Class A Group 1
2.8.1 Notes for installation of EMI filter:
In order to ensure that the EMI Filter can exert the greatest effect of suppressing the interference of the servo
drive, in addition to the installation and wiring of the servo drive according to the instructions in this Manual,
attention should also be paid to the following points:
1) The servo drive and EMI filter must be installed on the same well-grounded metal plane.
2) All wires should be as short as possible.
3) The metal casing of the servo drive and EMI filter must be reliably connected to the metal plane, and the
contact area should be as large as possible.
2.8.2 Notes for motor cable selection and installation
The selection and installation of motor cables partly determine whether EMI Filter can exert the maximum
interference suppression effect. Please note the following points:
1) Use cables with isolation copper mesh (preferably with double isolation layers).
2) The isolation copper mesh at both ends of the motor cable must be grounded at the shortest distance and
with the maximum contact area.
3) The isolation copper mesh of the motor cable must be correctly connected with the metal plane, and the
isolation copper mesh at both ends shall be fixed with the metal plane using a U-shaped metal piping
bracket.
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