EA180 Series Servo Drive Users Manual 3.2.3 Power-on timing sequence diagram Control circuit power supply Main circuit power supply Power on Power off Delay 1.5s Servo ready for output(S-RDY) Not ready Ready S-ON signal Invalid Valid Invalid Servo enable Enable invalid （ S-ON) Servo motor excitation Motor OFF Position/speed/ torque command Command not Figure 3-3 Power-on timing sequence diagram received Please refer to Figure 3-1 and Figure 3-2 for power supply connection, and turn on the power supply in the following sequence: 1) The power supply L1C and L2C of the control circuit must be turned on before or at the same time as the main circuit power supply is turned on.
If only the power supply of the control circuit is switched on, the servo ready signal (S-RDY) will not be valid. 2) Connect the power supply to the power input terminals (L1, L2 and L3 for three-phase, and L1 and L2 for single-phase) of the main circuit through the electromagnetic contactor. 3) After the power supply of the main circuit is turned on, the servo ready signal (SRDY) will be valid after a delay of about 1.5s, and now the servo enable (S-ON) signal can be accepted. After detecting that the servo enable signal is valid, the motor is excited and runs. If servo enable signal is void or an alarm is detected, the servo drive output is switched off and the motor is in a free state.
4) When the servo is enabled at the same time as the power supply is turned on, the motor will be excited in about 1.5 seconds. 5) Frequent switching on and off the main circuit power supply may damage the soft-start circuit and the energy consumption braking circuit. The frequency of switching on and off is preferably limited to 5 times per hour and less than 30 times per day. If the drive unit or motor is overheated, after the cause of the fault is eliminated, it will take 30 minutes to cool down before the power supply can be switched on again. 6) Do not connect the input power line to the output terminals U, V, and W, otherwise it will damage the servo drive.
7) It is absolutely forbidden to connect braking resistor between the P + and ⊖ terminals of the DC bus, otherwise a fire may be caused. 8) After the power supply is turned off, there may be residual voltage on the internal capacitor of the servo drive. Please make sure that the CHARGE indicator on the servo drive panel is off before checking. 22 Attention☞ 1. If you do not want to cut off the main circuit power supply in the event of a fault, there is no need to use the RA relay. 2. L1C and L2C can also be connected to P + and - terminals (with no need to distinguish polarity) respectively without using external power supply.
Power off Power on Enable invalid Motor OFF Command not received Command received