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Abbreviation
Description
NC
Not connected
PNP
Positive negative positive (transistor)
TNF
Nominal response temperature
Abbreviation Reference
Description
ATEX
ATEX Directive 2014/34/EU ATmosphere EXplosibles.
HFT
EN IEC 61508
Hardware fault tolerance: HFT=n means that n+1 faults could cause a loss of the
safety function.
PDS/SR
EN IEC 61800-5-2
Power drive system (safety-related).
PFD
EN IEC 61508
Average probability of failure on demand, value used for low-demand operation.
SFF
EN IEC 61508
Safe failure fraction [%]; percentage of safe failures and dangerous detected fail-
ures of a safety function or a subsystem related to all failures.
SIL
EN IEC 61508, EN IEC 62061 Safety integrity level.
STO
EN IEC 61800-5-2
Safe Torque Off
SRECS
EN IEC 62061
Safety-related electrical control system.
1.7.2 Conventions
Numbered lists indicate procedures.
Bulleted and dashed lists indicate listings of other information where the order of the information is not relevant.
Bolded text indicates highlighting and section headings.
Italicized text indicates the following:
Cross-reference.
Link.
Footnote.
Parameter name.
Parameter option.
Parameter group name.
All dimensions in drawings are in metric values (imperial values in brackets).
An asterisk (*) indicates the default setting of a parameter.
AQ267038105120en-000101 / 130R0104
10 | Danfoss A/S © 2022.08
Introduction
VLT® PTC Thermistor Card MCB 112
Operating Guide