Yamaha SRCP manual Installing an external leakage breaker, Installing a circuit protector

Models: SRCP

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INSTALLATION AND CONNECTION

2-2 Connecting the Power Supply

c CAUTION

The SRCP series controller does not have a power switch. Be sure to provide a power supply breaker (insulation) of the correct specifications that will turn the power on or off to the entire system including the robot controller. Power to EXT. CN must first be supplied before supplying power to the power supply terminal block. If this order is reversed, an alarm (06: 24V POWER OFF) might be issued to prevent operation. (See "2.7 Connecting to the EXT. CN Connector" in this chapter and Chapter 3, "I/O INTERFACE".)

w WARNING

Before beginning the wiring work, make sure that the power supply for the entire system is turned off. Doing the wiring work while power is still turned on may cause electrical shocks.

2-2-3 Installing an external leakage breaker

To ensure safety, a leakage breaker must be installed in the power supply connection section of the robot controller. Since the robot controller drives the motors by PWM control, leakage current flows at high frequencies. This might cause the external leakage breaker to malfunction.

When installing an external leakage current breaker, it is important to choose the optimum sensitivity current rating (IΔn). (Check the leakage breaker manufacturer's data sheets to select the optimum product compatible with inverters.)

Leakage current

SRCP

4mA (Max.)

c CAUTION

1.Leak current was measured with a leak tester with a low-pass filter turned on (100Hz). Leak tester: Hioki Electric 3283

2.When using two or more controllers, sum the leakage current of each controller.

3.Make sure that the controller is securely grounded.

4.Stray capacitance between the cable and FG may vary depending on the cable installation condition, causing the leakage current to fluctuate.

w WARNING

Electrical shocks, injuries or fires might occur if the motor breaks down while the robot controller is used without installing a leakage breaker.

2-2-4 Installing a circuit protector

To ensure safety, a circuit protector must be installed in the power supply connection section of the robot controller. An inrush current, which might be from several to nearly 20 times higher than the rated current, flows at the instant that the SRCP controller is turned on or the robot motors start to operate.

When installing an external circuit protector for the robot controller, select a circuit protector that provides optimum operating characteristics.

To ensure proper operation, we recommend using a medium to slow response circuit protector with an inertial delay function. (Refer to the circuit protector manufacturer's data sheets for making the selection.)

Example

Rated current

Operating characteristics

Slow type with inertia delay

SRCP20A( 300% 2 sec. ) 1000% 0.01 sec.

w WARNING

Electrical shocks, injuries or fires might occur if the motor breaks down while the robot controller is used without installing a circuit protector.

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Yamaha SRCP manual Installing an external leakage breaker, Installing a circuit protector