IMO SD1 Series - Page 118

SD1 Series Inverters Fault Tracking
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disappear automatically after state restoration, which requires no reset action. After reset of
external running command, the drive will execute running command again.
Running
command
Running
VFD output
Running
Stop
Running
Running
Stop
H1
H2
ON
ON
ON
ON
OFF
OFF
Fig 6.4
STL1 fault
As shown in below fig 6.5, when the hardware circuit of safety circuit 1 is abnormal while that
of H2 signal is normal, namely, when H1 is abnormal during operation (safety function is
required), the drive enters safety mode and stops output no matter whatever the running
command is. Despite of reset commands and external running commands reset, the drive will
not execute running command again, and it is STL1 alarm locked all the time.
Running
command
Running
Stop
H1
VFD output
Running
Stop
Running
ON ON
OFF
Reset
Reset (RST)
H2
ON
Fig 6.5
STL 2 fault
As shown in below fig 6.6, when the hardware circuit of safety circuit 2 is abnormal while that
of H1 signal is normal, namely, when H2 is abnormal during operation (safety function is
required), the drive enters safety mode and stops output no matter whatever the running
command is. Despite of reset commands and external running commands reset, the drive will
not execute running command again, and it is STL2 alarm locked all the time.