DA98A AC Servo Drive Unit
User Manual
CHAPTER 7 RUNNING
49
z The drive unit and the motor must be well grounded, and the PE terminal of drive
unit must be well connected with the device grounding part.
z It is suggested that the power supply of drive unit is provided via isolation
transformer and power supply filter to get better security and anti-interference
capability.
z Only after wiring is correctly completed could the power supply be switched on.
z An emergent stop circuit should be connected to cut off the power supply
immediately if there is a fault in the system. (Refer to Fig. 7.1).
z After alarm is issued by the drive unit, it should be ensured that the fault has been
resolved and SON signal is invalid before restart.
z Do not touch the AC servo drive unit and motor within at least 5 minutes to avoid
electric shock after their power is cut off.
z Be careful of the scalding by the temperature rising of the drive unit and motor
running for a span of time.
Note
7.1 Power supply connection
Refer to Fig. 7.1 for power supply connection and connect it by following steps:
1) Connect the power supply with the power input terminals (3-phase to R, S, T and single
phase to R,S ) of the main circuit via electromagnetism contactor.
2) The control circuit power supply r, t and the main power supply are switched on
simultaneously or the former is prior to the latter. If power supply of control circuit is
switched on singly, the servo ready signal (SRDY) is set for OFF.
3) After the main power supply is switched on and 1.5s delay, and the servo ready signal
(SRDY) is set for ON for receiving the servo enable (SON)signal and if the SON signal is
detected to be valid，the AC servo drive unit output is valid and the motor is excited for
running. When the SON signal is detected to be invalid or alarm is issued with the PWM
circuit off, the motor is in a free state.
4) The PWM circuit is put on in about 1.5s when the SON and power supply are through.
5) If the power supply is switched on or off frequently, the soft start circuit and the energy
brake circuit may be damaged. The on-off frequency should be less than 5 times in one
hour and 30 times less each day. Owing to the overheating of the drive unit and the motor,
the power supply can be switched on only after the fault is resolved and 30-minute
cooling.
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