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1.4 Selection of other accessories
1.4.1 Selection of regenerative resistance
When the servo motor is driven by the generator mode, the power returns to the servo amplifier side, which is
called regenerative power. The regenerated power is absorbed by charging the smooth capacitor of the servo
amplifier. After exceeding the rechargeable energy, the regenerative resistance is used to consume the
regenerative power.
The servo motor driven by regenerative (generator) mode is as follows:
➢ The deceleration stop period during acceleration and deceleration operation;
➢ Running vertically and axially;
➢ When the external load drives the motor to rotate.
Regenerative resistance connection terminals
Use external regenerative resistance, connect regenerative resistance to RB+
and RB- terminals, P0-25 = power value, P0-26 = resistance value.
The following table is the recommended specifications of external regenerative resistance for each type of motor.
Rmin
(Not less than this value)
External regenerative
resistance
(Recommended power values)
Note:
(1) The smaller the resistance is, the faster the discharge will be, but the smaller the resistance is, the easier the
breakdown resistance will be. Therefore, please close to the the lower limit but not be less than the lower limit
when choosing the type.
(2) When wiring, please use high-temperature flame-retardant wire, and the regenerative resistance surface can
not contact with the wire.
1.4.2 Fuse selection
The role of fuse in the circuit is over-current protection, also known as short-circuit protection.
When there is a short circuit, the current in the circuit is the largest, which undoubtedly far exceeds the rated
current of the equipment. If the circuit breaker is not cut off in time, the electrical equipment will soon be burned
due to the high current. Therefore, in order to cut off the circuit in time and protect the equipment from damage,
the fuse is used, the principle is that the fuse can be fused quickly before the equipment is damaged at the moment
when a large current is generated in the circuit, so as to cut off the circuit.
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