Hitachi SJ Series Safety Function Manual page 5

M
Description
Term/Abbreviation
Power supply necessary for
Main power supply
operation of inverter
MFG No. Manufacturing No.
Mean time to dangerous failure
MTTFd Expectation of the mean time
to dangerous failure
O
Term/Abbreviation Description
The keypad mounted on the
inverter used for configuration
Operator keypad
of parameters and monitoring
of inverter's state
P
Term/Abbreviation Description
Protected
PELV
(EN/IEC60204)
Probability
PFD
failure on demand (IEC61508)
Average
PFH dangerous
(EN/IEC61800-5-2)
Performance level (a-e) (EN ISO
PL
13849-1)
PLC Programmable logic controller
PWM Pulse width modulation
R
Term/Abbreviation Description
Risk remaining after protective
Residual risk
measures have been taken
Delay time inside of the
inverter from a request of
Response time activation of a function until
actual
function
Probability and severity of
Risk
hazard
S
Term/Abbreviation Description
Safety functions to achieve safe
state of system such as STO
Safety Function
function defined in IEC61800-
5-2.
Whole
Safety-Related inverter, sensor, switch and
System safety relay etc. that achieves
Safety function(s)
Safety
SELV
(EN/IEC60950)
Safe
SFF
(IEC61508)
extra-voltage
of dangerous
frequency of a
failure
[1/h]
execution of the
system including
extra-low voltage
failure fraction (%)
S-3
S
Term/Abbreviation Description
Safety function, STO etc. is
Safety state
operating correctly
Safety
SIL
(IEC61508)
SILCL SIL claim limit (EN/IEC62061)
Signal is recognized as ON when
current flows out from signal
Sink logic
terminal.
depending on systems
A type of logic that signal is
recognized as ON when current
Source logic flows into the terminal. This
logic may differ depending on
region or system.
The label
Specification label product, on which specification
of the inverter is written
Safe torque off (EN/IEC61800-5-
STO
2)
A type of stop category defined
in EN/IEC60204-1.
Stop category 0 Stopping by immediate removal
of power to the machine
actuator.
U
Term/Abbreviation Description
The
provides
User's Guide
information
inverter
V
Term/Abbreviation Description
Confirmation by examination
and provision of objective that
Validation the safety system meets the
requirements
specification
Confirmation by examination
and
Verification
evidence that the requirements
have been fulfilled
Introduction
integrity level (1-3)
That may differ
affixed on the
documentation that
the detailed
to handle the
set by the
provision of objective