Rorze RD-023MS - Protection Circuits and Heat Management

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12. Heat Dissipation 13. Other Functions 14. Consumption Current

１２．Heat Dissipation

Caution

Please dissipate heat generated by driver and motor enough.

If it is insufficient, temperature rise causes malfunction, failure or fire.

Keep the motor’s maximum case temperature below 100℃ and driver’s below 60℃ by adjusting

the drive current or by installing a cooling fin, fan, etc.

１３．Other Functions

13-1 Auto. current down

This works after about 0.3 seconds of inactivity. Setting stop current lower to run current will

prevent heat generation. However, if stop current is high, position gap will decreases. (See fig. 4)

Also even if the motor rotation is stationary, the auto. current down doesn’t work under the condition

applying the voltage between clock input terminals.

13-2 Over heating protection circuit

This works when the internal temperature of the driver reaches about 70℃. It turns ALARM output

ON and ALARM LED will be turned ON. Furthermore, if the temperature keeps on rising, it stops

motor compulsively and works auto. current down. If the body temperature drops about 10℃

below the triggered temperature, the driver will restore automatically.

13-3 Over current protection circuit

This works when abnormal current inside the driver occurred by mis-wiring or short-circuiting etc.

has been detected.

13-4 Low supply voltage protection circuit

The driver has a built-in low voltage protection circuit to prevent current overload. The low supply

voltage condition normally occurs when power is turned ON.

１４．Consumption Current

The current consumed by driver and motor varies, depending on the supply voltage, pulse (clock)

frequency, motor’s inductance, rated current and holding torque. Also, the ripple according to the

cycle of PWM (50kHz) and RPM is added into the consumption current. Please use the power

supply which current is more than 1.2 times the rated current of the motor as a standard.

If other devices share the same power supply and voltage change can’t be allowed, then use the

power supply which can flow 1.7 times of the max value of the supply current, or incorporate a large

capacitor.

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