Periodic Inspection
The redundancy circuit is configured so that when the safety function is activated, the inverter shuts off
its output if current no longer flows to either the safety input terminal [SF1] or [SF2]. Therefore, the
inverter must be periodically inspected to ensure that there is no defect in the [SF1] and [SF2] terminal
wirings so that redundancy is not lost to ensure reliable operation. Be sure to perform periodical in-
spection at least once in three months.
In periodic inspection, inspect the statuses shown in the table below.
Signal Status 1 Status 2 Status 3 Status 4
Input SF1 OFF ON OFF ON
SF2 OFF OFF ON ON
Output EDM ON OFF OFF OFF
Output to motor Shut off Shut off Shut off Output ena-
bled
Alarm None ECF ECF None
Timing of transition to safety status
When one of safety input terminals [SF1] and [SF2] turns OFF and then both terminals turn OFF within
50 ms, control transitions to the STO state.
Normal state
STO state
RUN command
Safety input 1 terminal [SF1]
Safety input 2 terminal [SF2]
Motor power ON state
EDM output
Normal state
on
on
on
off
off
off
Response time w
ithin 50 ms
STO state
Within 20 ms
Within 50 ms
When one of terminals [SF1] and [SF2] turns OFF and then both terminals do not turn OFF within 50
ms, EN circuit failure (alarm code: ECF) is generated.
RUN command
Safety input 1 terminal [SF1]
Safety input 2 terminal [SF2]
Motor power ON state
EDM output
EN circuit failure (ECF)
Normal state
Normal state
Normal Alarm output
on
on
onoff
off
off
STO state
STO state
50 ms
When terminals [SF1] and [SF2] are turned ON from an STO state, control returns from the STO state.
7 Other Functions
7-72
M1 Series Standard Type User's Manual (I669)
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