Danfoss VLT MCB 150 Operating Instructions Manual page 9

Introduction
PL/ Discrete level used to specify the ability of
Performance safety-related parts of control systems to perform
Level a safety function under foreseeable conditions
(EN ISO 13849-1)
PUST Power Up Self Test. Internal self test on the
safety option.
RS-485 Fieldbus interface as per EIA-422/485 Bus
Description, which enables serial data
transmission with multiple devices.
Safe state If a safe state fault is detected, the safety option
goes into safe state. This includes faults related
to integrity of hardware or firmware.
SF Safe Function
SIL Safety Integrity level (IEC61508, IEC61800-5-2,
IEC62061)
SLS - Safely Safety function in accordance with EN IEC
limited speed 61800-5-2, monitors the frequency converter to
check that it stays within a defined speed limit.
SLS is the abbreviation for safely limited speed.
SO Safety Option
SRECS Safety Related Electrical Control System (IEC
62061)
SRP/CS Safety related parts of control systems (EN ISO
13849-1)
SS1 - Safe Safety function in accordance with EN IEC
Stop 1 61800-5-2, ensures that the motor decelerates in
the expected way. SS1 is the abbreviation for
safe stop 1.
STO - Safe Safety function in accordance with EN IEC
Torque Off 61800-5-2, prevents torque from being
generated by the motor. This function is
integrated within the frequency converter as
standard. STO is the abbreviation for safe torque
off.
TM Mission Time (EN ISO 13849-1)
Warning If the term is used outside the context of safety
instructions, a warning alerts to a potential
problem that was detected by a monitoring
function. A warning is not an error and does not
cause a transition of the operating state.
Table 1.1 Abbreviations and Definitions
MG34W302
Operating Instructions
Danfoss A/S © Rev. 2014-02-11 All rights reserved.
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