2.7.3 Precautions for use of an external braking resistor When an external braking resistor is used, the resistor is connected to terminals P+ and C of the driver; at the same time, the short-circuiting piece installed on terminals P+ and D shall be removed to leave the circuit between terminals P and D open. The resistance of the external braking resistance shall be no less than that provided in Table 2-2; otherwise damage may be caused to the driver. Please set the resistance and capacity of the external braking resistor correctly to the functional parameters of the driver; otherwise execution of the function will be executed.
● P8-10 (resistance of the braking resistor), P8-11 (power of the braking resistor), P8-13 (derated percentage of the braking resistor). In the natural environment, when the recoverable capacity (average value) that can be handled by the braking resistor is used at the rated capacity, the resistor temperature will rise to above 120℃(under the condition of constant braking). For the sake of safety, forced cooling shall be performed to lower the temperature of the braking resistor; alternatively, it is recommended to use a braking resistor with a thermoswitch. For load characteristic of the braking resistor, please consult the manufacturer.
2.8 Measures against disturbance The servo unit has a built-in micro-processor that may be affected by electromagnetic noise produced by peripheral devices of the driver. To suppress noise disturbance between the servo driver and peripheral devices, measures for protection against electromagnetic noise may be taken as necessary. ● It is advisable to place the input command device and the electromagnetic noise filter near the servo driver wherever possible. ● Do install surge absorbers on the coil of the relay, the solenoid and the electromagnetic contactor. ● Do not set the following cables into the same sleeve or trunking, nor bind them together.
Besides, it is required to keep an interval of above 30cm upon wiring. ■ Main circuit cable and input/output signal cable. ■ Main circuit cable and encoder cable. ● Do not use the same power source with an electric discharge machine, an electric welder or a high-frequency induced furnace. It is required to connect a noise filter on the input side of the main circuit power cable and the control power cable when a high frequency generator is present nearby, even if not the same power source is used. For connection of the noise filter, refer to Section 2.8.1. ● Proper grounding is required.
2.8.1 Noise filter (EMI Filters) All electronic devices (including the servo driver) will, during normal operation, produce some high- or low-frequency noise that will transmitted or radiated to disturb peripheral devices. Use and proper installation of an EMI filter can minimize such disturbance. If the servo driver and EMI filter can be installed and wired in accordance with this Manual, we can assure that they conform to the following specifications: 1. EN61000-6-4 (2001) 2. EN61800-3 (2004) PDS of category C2 3. EN55011+A2 (2007) Class A Group 1 An example of wiring is shown below 17 Technical Manual for EA190 Series Servo Driver V100 Caution☞ 1.
The resistance of the external braking resistance shall be no less than that provided in Table 2-2; otherwise damage may be caused to the driver. 2. When an external brake resistor is used, failure to remove the short-circuiting piece between P+ and D may cause damage to the driver Important ● The servo unit is an industrial device, and thus no measure against radio disturbance is adopted.
● The servo unit has a high-speed switching element in its main circuit, and electromagnetic noise produced by the switching element may affect peripheral devices of the servo unit.When it used near a residence, or in any other place where radio disturbance is a problem of concern, measures against noise disturbance shall be taken.