Functional Safety For Frequency Converters With Sto, Not Upgradable (+Bef1); Ic7 Functional Safety; Overview - Danfoss iC7 Series Operating Manual

Operating Guide | iC7-Automation Functional Safety Functional Safety for Frequency Converters with STO, Not Upgradable (+BEF1)
Functional Safety for Frequency Converters with STO, Not Upgradable
3
(+BEF1)
3.1

iC7 Functional Safety

3.1.1

Overview

Frequency converters with the functional safety option STO, not upgradable (+BEF1) provide the Safe Torque Off (STO) safety function
with a dual-channel, galvanically isolated input, and an STO feedback signal for diagnostic purposes.
The drive integrates the STO functionality via the functional safety I/O terminals as described in
The iC7 drive with STO functionality is designed and approved suitable for the requirements of:
Category 3 in EN ISO 13849-1
l
Performance Level "e" in EN ISO 13849-1
l
SIL 3 in IEC 61508 and 61800-5-2
l
The STO safety function is active if one or both of the STO inputs are not connected to a +24 V signal. The frequency converter is not able
to go to the RUN state. For more information, see
Prerequisites for normal operation (STO function is not active) are:
STO A and STO B signals are energized.
l
No internal faults are active.
l
All control inputs and outputs are galvanically isolated from supply voltage (PELV) and other high voltage terminals, unless otherwise
specified.
Table 3: Functional Safety I/O Terminals in Frequency Converters
Terminal X31
Numbering Terminal name
41 24 V
42 S.INA+
43 S.INB+
44 S.FB+
Table 4: Instances of the STO Function and STO Feedback Output
STO inputs
Both inputs energized
with 24 V DC
Power removed from
both inputs
Only 1 input energized
1) Regular STO demand: Can be either fault or warning depending on restart settings.
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Table 4.
Functions
+ 24 V DC Output
+ STO Input Chan-
nel A
+ STO Input Chan-
nel B
+ STO Feedback
Operating conditions STO function
Normal operation Deactivated
STO demand Activated
Failure in demand or Activated
due to internal fault
Table
Terminal X32
Numbering Terminal name
45 GND
46 S.INA–
47 S.INB–
48 S.FB–
STO feedback signal
Deactivated
Activated
Deactivated
3.
Functions
0 V/GND
- STO Input Chan-
nel A
- STO Input Chan-
nel B
- STO Feedback
Fault or warning text
No faults or warnings
(1)
"STO activated"
"STO – Fault [channel
(2)
name]"
AQ319741840653en-000401 / 136R0268