asynchronous, synchronous motors and permanent
magnet motors. See examples in 3.12.1 Terminal 37 Safe
Stop Function.
NOTE
FC 301 A1 enclosure: When Safe Stop is included in the
frequency converter, position 18 of Type Code must be
either T or U. If position 18 is B or X, Safe Stop Terminal 37
is not included!
Example:
Type Code for FC 301 A1 with Safe Stop:
FC-301PK75T4Z20H4TGCXXXSXXXXA0BXCXXXXD0
WARNING
After installation of Safe Stop (STO), a commissioning test
as specified in section Safe Stop Commissioning Test of the
Design Guide must be performed. A passed commissioning
test is mandatory after first installation and after each
change to the safety installation.
Safe Stop Technical Data
The following values are associated to the different types
of safety levels:
Reaction time for T37
- Maximum reaction time: 20 ms
Reaction time = delay between de-energizing the STO
input and switching off the output bridge.
Data for EN ISO 13849-1
- Performance Level "d"
- MTTF
d
(Mean Time To Dangerous Failure): 14000
years
- DC (Diagnstic Coverage): 90%
- Category 3
- Lifetime 20 years
Data for EN IEC 62061, EN IEC 61508, EN IEC 61800-5-2
- SIL 2 Capability, SILCL 2
- PFH (Probability of Dangerous failure per Hour) =
1=-10/h
- SFF (Safe Failure Fraction) > 99%
- HFT (Hardware Fault Tolerance) = 0 (1001
architecture)
- Lifetime 20 years
Data for EN IEC 61508 low demand
- PFDavg for 1 year proof test: 1E-10
- PFDavg for 3 year proof test: 1E-10
- PFDavg for 5 year proof test: 1E-10
No maintenance of the STO functionality is needed.
Take security measure, e.g. only skilled personnel must be
able to access and install in closed cabinets.
SISTEMA Data
From Danfoss Functional safety data is available via a data
library for use with the SISTEMA calculation tool from the
IFA (Institute for Occupational Safety and Health of the
German Social Accident Insurance), and data for manual
calculation. The library is permanently completed and
extended.
Abbrev. Ref. Description
Cat. EN ISO
13849-1
Category, level “B, 1-4”
FIT Failure In Time: 1E-9 hours
HFT IEC 61508 Hardware Fault Tolerance: HFT = n means,
that n+1 faults could cause a loss of the
safety function
MTTFd EN ISO
13849-1
Mean Time To Failure - dangerous. Unit:
years
PFH IEC 61508 Probability of Dangerous Failures per
Hour. This value shall be considered if the
safety device is operated in high demand
(more often than once per year) or
continuous mode of operation, where the
frequency of demands for operation made
on a safety-related system is greater than
one per year
PFD IEC 61508 Average probability of failure on demand,
value used for low demand operation.
PL EN ISO
13849-1
Discrete level used to specify the ability of
safety related parts of control systems to
perform a safety function under
foreseeable conditions. Levels a-e
SFF IEC 61508 Safe Failure Fraction [%] ; Percentage part
of safe failures and dangerous detected
failures of a safety function or a
subsystem related to all failures.
SIL IEC 61508 Safety Integrity Level
STO EN
61800-5-2
Safe Torque Off
SS1 EN 61800
-5-2
Safe Stop 1
Table 3.20 Abbreviations related to Functional Safety
3.12.1
Terminal 37 Safe Stop Function
The FC 302 and FC 301 (optional for A1 enclosure) is
available with safe stop functionality via control terminal
37. Safe stop disables the control voltage of the power
semiconductors of the frequency converter output stage
which in turn prevents generating the voltage required to
rotate the motor. When the Safe Stop (T37) is activated,
the frequency converter issues an alarm, trips the unit, and
coasts the motor to a stop. Manual restart is required. The
safe stop function can be used for stopping the frequency
converter in emergency stop situations. In the normal
operating mode when safe stop is not required, use the
frequency converters regular stop function instead. When
Introduction
VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
MG33BE02 - VLT
®
is a registered Danfoss trademark 53
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