10 Application examples
ESR5-NV3-30
12/19 MN049010EN
www.eaton.com
21
10 Application examples
10.1 Two-channel emergency stop circuit with DA1 variable frequency drive
Application
•
The SS1 function can be used to shut down drives in a controlled
manner if a braking ramp is used. The STO function can then either be
activated after a set delay time or once the drive has come to a standstill
(stop category 1). The SS1 function is purely functional and is therefore
not classified as safety-related.
•
The STO function may also be used in machines with electronically
controlled drives.
•
Suitable up to category
3, PL d (EN
ISO
13849-1), SILCL 2 (EN
62061)
Conditions
•
Emergency-stop buttons with positive-opening contacts (IEC 60947-5-1
Appendix K), in accordance with EN ISO 13850.
•
Use safety relays with positive-opening contacts.
•
Install the emergency-stop buttons outside the hazardous area and in
a place where they are clearly visible.
•
Only start hazardous motion after a separate reset.
•
Test the emergency-stop function once every quarter.
•
Ensure compliance with any additional applicable standards,
e.g. IEC 60204-1.
•
Use a twisted and screened cable for the power supply to STO+
and STO-.
•
Route the supply cable through a covered cable duct.
•
Ensure that the braided screening (PES) is grounded.
•
The DA1 variable frequency drive and the saftey relay must be
configured in line with the requirements of the application at hand.
•
The ramp time of the selected DA1 variable frequency drive must be
shorter than the delay time of the safety relay.
Features
•
Design based on proven components and safety principles
(EN ISO 13849-1 and EN ISO 13849-2).
•
The pilote device, input wiring and command processing are redundant
and self-monitoring.
→
The emergency-stop function is an additional safety function.
It may not be used as the sole means of protection!
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