Glossary - VLT® Safety Option MCB 152
B
Blank initial state The blank initial state is the state of the safety option when it leaves the fac-
tory with default settings.
D
Degree of protection The degree of protection is a standardized specification for electrical equip-
ment that describes the protection against the ingress of foreign objects
and water (for example, IP20).
E
Error Discrepancy between a computed, observed, or measured value or condi-
tion and the specified or theoretically correct value or condition.
Error class Classification of errors into groups. The different error classes allow for spe-
cific responses to errors, for example by severity.
F
Fatal error If a fatal error occurs, the product is no longer able to control the motor so
that the power stage must be immediately disabled.
P
Parameter Device data and values that can be read and set (to a certain extent) by the
user.
PL/Performance level Discrete level used to specify the ability of safety-related parts of control
systems to perform a safety function under foreseeable conditions (EN ISO
13849-1).
R
RS485 Fieldbus interface as per EIA-422/485 Bus Description, which enables serial
data transmission with multiple devices.
S
Safe state If a safe state fault is detected, the safety option goes into safe state. This
includes faults related to integrity of hardware and firmware.
STO - Safe Torque Off Safety function in accordance with EN IEC 61800-5-2, prevents torque from
being generated by the motor. This function is integrated within the drive
as a standard.
W
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
Glossary - VLT® Safety Option MCB 152Installation Guide | VLT®Safety Option MCB 152
AN327351953089en-000101 / 130R0578| 79
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