Shihlin SDH Series, Руководство пользователя

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92
SDH Series Manual
6.6 Other functions
• Before wiring or inspection, switch power off and wait for more than 10 minutes. Then, confirm if the
power indicator is off or the voltage is safe with voltage meter. Otherwise, you may get an electric
shock.
• Please use the specified peripheral equipment products. Otherwise may cause fire or failure.
6.6.1 Selection of brake resistor
• Regenerative resistor and servo drives in addition to the specified combination is not available or it
may become a fire hazard.
As the direction of motor generated torque is opposite to the rotary direction of motor, it becomes a power
generator. The regenerative energy would be turned back to the servo drive. To prevent from P-N voltage exceeded, a
voltage (under 370V) stabilized protection is necessary. The IGBT switch and brake resistors constitute this protection.
Regenerative energy is consumed by the brake resistor.
There is a built-in brake resistor inside the drive. If the regenerative energy is too large, it is not recommended to
use the one. Instead, use an external one to avoid overheating. When using the built-in brake resistor, make sure that the
P-D terminals is short-circuit. If the external brake resistor applied, make P/D terminals open while the external resistor is
connected to the P/C terminals.
Built-in brake resistor specifications for Shihlin servo drive are described below.
Drive (W)
Built-in brake resistor specification
Minimum permissible (Ω) Consumption power of built-in
resistor (W)
resistor (Ω) Capacity (W)
100 100 20 100 10
200 100 20 100 10
400 100 20 100 10
500 100 20 100 10
750 40 40 40 20
1000 40 40 40 20
1500 13 100 13 50
2000 13 100 13 50
3500 13 100 13 50
• The average regenerative power that could be consumed is at 50% rated power of the built-in brake resistor.
So as the external brake resistor.
As external brake resistor is applied, the same resistance value mentioned above is required. If serial or parallel wiring
are applied to increase resistor’s power, be sure that the resistance meets the minimum permissible specification. The
brake resistor with a thermal switch or a cooling fan would be helpful to tell users that the capacity of brake resistor is
insufficient or to reduce the temperature of brake resistor. Please contact the manufacturer of brake resistor to know the
detail load characteristic.
In order to let users easily calculate the power of external brake resistor, the calculations are described below.
(a) Without external load
If the motor is repeated running forward and reverse, the braking regenerative energy would return to the aluminum
capacitors of servo drive. When the P-N voltage exceeds a particular value, the brake IGBT switch is turn on and the
brake resistor would dissipate the regenerative energy. The following statement and table provide the calculation of
regenerative power.
Drive (W) Motor inertia(x10
-4
kg ‧ m
2
)
Regenerative power which from rated
speed to stop without load Es(joule)
Regenerative energy of capacitor
Ec(joule)
100 0.055 0.27 8.98
200 0.208 1.03 8.98
400 0.335 1.65 11.02
500 6.59 14.45 11.02
750 1.2 5.92 19.18
1000 12.56 27.55 19.18
1500 18.52 40.62 41.62
2000 38.8 85.10 41.62
3500 74.8 164.05 55.49
DANGER
CAUTION
CAUTION