Power On Sequence - YASKAWA SGD7S-1R9D Product Manual

4.3 Wiring the Power Supply to the SERVOPACK

4.3.3 Power ON Sequence

4.3.3

Power ON Sequence

Consider the following points when you design the power ON sequence.
• The ALM (Servo Alarm) signal is output for up to five seconds when the control power supply
is turned ON. Take this into consideration when you design the power ON sequence, and
turn ON the main circuit power supply to the SERVOPACK when the ALM signal is OFF (alarm
cleared).
Control power supply
Main circuit power supply
• Design the power ON sequence so that main circuit power supply is turned OFF when an
ALM (Servo Alarm) signal is output.
• Make sure that the power supply specifications of all parts are suitable for the input power
supply.
• Allow at least 1 s after the power supply is turned OFF before you turn it ON again.
Important
4-14
Power ON
Servo Alarm (ALM)
Alarm
output signal
Up to 5.0 s
Turn ON the control power supply and the main circuit power supply at the same time or turn ON
the control power supply before the main circuit power supply.
Turn OFF the main circuit power supply first, and then turn OFF the control power supply.
 Even after you turn OFF the power supply, a high residual voltage may still remain in the
SERVOPACK. To prevent electric shock, do not touch the power supply terminals after you
turn OFF the power. When the voltage is discharged, the CHARGE indicator will turn OFF.
Make sure the CHARGE indicator is OFF before you start wiring or inspection work.
Alarm cleared.
WARNING