E1 Series Servo Drive User Manual Safety Function
HIWIN MIKROSYSTEM CORP. 12-3
12.2.1 Risk assessment
Risk assessment must be done before using STO safety function. When STO safety function is enabled,
the following potential risks could exist. Take these risks into consideration while doing risk assessment.
(1) When STO safety function is enabled, the motor could still be moving due to external force, such as
gravity on vertical axis.
(2) If the servo drive malfunctions as STO safety function is enabled, the motor could move within a
small range (within half of magnetic pole pair pitch).
(3) When STO safety function is used as emergency stop function, please be noted that only the power
supplied to the internal power module of the servo drive will be cut off. The main circuit power cannot
be cut off, so another device must be installed to cut off the main circuit power during maintenance.
12.2.2 STO safety function enabling state
The servo drive state when STO safety function is enabled is shown in figure 12.2.2.1. When SF1 and
SF2 signals are OFF, STO safety function is enabled. The servo drive goes into STO safety function
enabling state (STO state).
STO safety function enabling state
Figure12.2.2.1
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