GFK-3111A PACMotion VFD AC Variable Speed Drive User Guide 39
External Power Supply Specication
Table 23: External Power Supply Specication
Voltage Rating (Nominal) 24 V DC
STO Logic High 18-30 V DC (Safe torque off in standby)
Current Consumption (Maximum) 100 mA
Safety Relay Specication
The safety relay should be chosen so that at minimum it meets the safety standards that the drive meets.
Table 24: Safety Relay Specication
Standard Requirements SIL2 or PLd SC3 or better (With Forcibly guided Contacts)
Number of Output Contacts 2 independent
Switching Voltage Rating 30 V DC
Switching Current 100 mA
Enabling the “STO” Function
The “STO” function is always enabled in the drive regardless of operating mode or parameter changes made
by the user.
Testing the “STO” Function
Before commissioning the system the “STO” function should always be tested for correct operation, this
should include the following tests:
• With the motor at standstill, and a stop command given to the drive (as per the start source method
selected in P1-13):
o De-energise the “STO” inputs (Drive will display “INHIBIT”).
o Give a start command (as per the start source method selected in P1-13) and check that the drive still
displays “Inhibit” and that the operation is in line with the section “STO” Operation and section “STO”
Status and Monitoring.
• With the motor running normally (from the drive):
o De-energise the “STO” inputs.
o Check that the drive displays “INHIBIT” and that the motor stops and that the operation is in line with
the section and section “STO” Operation and section “STO” Status and Monitoring.
“STO” Function Maintenance
The “STO” function should be included within the control systems scheduled maintenance program so that
the function is regularly tested for integrity (Minimum once per Year), furthermore the function should be
integrity tested following any safety system modications or maintenance work. If drive fault messages are
observed refer to section Fault Messages on page 90 for further guidance.
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