LAFERT HP Combi Flow - Page 28

28 | HPI Combi Flow User Guide | Version 3.11 www.lafert.com
4.10.7. Recommended “STO” Wiring
Using an External 24V DC Power Supply Using the Drives On-board 24V DC Supply
L1
L3 EMCL2/N
UVW
I0I0II0I0I
L1
L3 EMCL2/N
UVW
I0I0II0I0I
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
- Twisted-Pair
- Shielded cables
Protective Capped Trunking
or equivalent to prevent
STO Cable short circuit to
an external Voltage source.
Safety relay
Protective Capped Trunking
or equivalent to prevent
STO Cable short circuit to an
external Voltage source
.
Safety
relay
Protected
shielded cables
0V
+24Vdc
External
Power
Supply
L1
L3 EMCL2/N
UVW
I0I0II0I0I
L1
L3 EMCL2/N
UVW
I0I0II0I0I
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
- Twisted-Pair
- Shielded cables
Protective Capped Trunking
or equivalent to prevent
STO Cable short circuit to
an external Voltage source.
Safety relay
Protective Capped Trunking
or equivalent to prevent
STO Cable short circuit to an
external Voltage source
.
Safety
relay
Protected
shielded cables
0V
+24Vdc
External
Power
Supply
+24V DC
Wires should be
protected against
short circuits as shown
above
NOTE The Maximum cable length from Voltage source to the drive terminals should not exceed 25 metres.
4.10.8. External Power Supply Specification
Voltage Rating (Nominal) 24V DC
STO Logic High 18-30V DC (Safe torque off in standby)
Current Consumption (Maximum) 100mA
4.10.9. Safety Relay Specification
The safety relay should be chosen so that at minimum it meets the safety standards in which the drive meets.
Standard Requirements SIL2 or PLd SC3 or better (with forcibly guided contacts)
Number of Output Contacts 2 independent
Switching Voltage Rating 30V DC
Switching Current 100mA
4.10.10. Enabling the “STO” Function
The “STO” function is always enabled in the drive regardless of operating mode or parameter changes made by the user. In order
to ensure that the drive does not immediately re-start when the STO is energised, the 'start mode' (P2-36) should be set to 'Edge-r' as
opposed to the default value of 'Auto-0'. This means that when the drive is ready to run (STO active and drive healthy), it will only start
when it sees a rising edge on the run command.
4
Electrical Installation