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Do not modify the Inverter by any means. Any modification will void not only the compliance
with the standard, but also the product warranty.
The response time is defined as the time from the input of a request to activate the safety function until
the activation of the safety function. In the case of the STO function, it is the time from input of STO sig-
nals until shutoff of the power to the motor.
For the 3G3MX2-EV2 Series Inverter, the response time of the STO function is 20 ms or less.
Taking this response time into consideration, design the system so that the equipment does not cause
dangerous situations.
The 3G3MX2-EV2 Series Inverter has a diagnosis function to detect faults in internal safety paths.
If a fault is detected in the safety paths, the internal diagnosis function maintains the output to the motor
in a shutdown state, regardless of the STO signal status.
The 3G3MX2-EV2 Series Inverter has two STO inputs to which redundant, dual signals must be input.
It is assumed that properly separated dual STO signals are input from an external device. In order to
comply with the standard, both inputs must be used.
To connect a host device that outputs diagnostic test pulses to the GS1/GS2 terminals, keep the OFF
pulse width of the test pulses to 500 µs or less.
To monitor the input status of STO signals to the 3G3MX2-EV2 Series Inverter or the fault detection
sta- tus of the internal safety paths using an external device, use the EDM output terminal.
The EDM signal is a reference signal. You cannot use the EDM signal to drive safety devices.
In order to maintain the SIL and PL levels of the functional safety system, it is necessary to perform a
periodic functional test for properly verifying the STO function at least once a year.
In the STO functional test, check that the status of the output to the motor and the status of the EDM
signal in response to the GS1 and GS2 inputs are in accordance with the table provided in 7-10-4 Peri-
odic Inspection on page 7-104.
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