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| 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
EMC
L2/N
U
V
W
I0I0I
I0I0I
L1
L3
EMC
L2/N
U
V
W
I0I0I
I0I0I
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
EMC
L2/N
U
V
W
I0I0I
I0I0I
L1
L3
EMC
L2/N
U
V
W
I0I0I
I0I0I
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
Elec
trical Installation
