ABB ACS880-104

DescriptionTerm
Safety integrity level (1...3) (IEC 61508)SIL
Safe stop 1 (IEC/EN 61800-5-2)SS1
Safe stop emergencySSE
Safe torque off (IEC/EN 61800-5-2)STO
There are three categories of stop functions:
• stop category 0: an uncontrolled stop where power to the machine actuators is re-
moved immediately (STO)
• stop category 1: a controlled stop where the machine actuators have power for
stopping, after which the power is removed (SS1)
• stop category 2: a controlled stop where the machine actuators continue to have
power SS2).
Stop category
Proof test interval. Defines the probabilistic failure rate (PFH or PFD
avg
) for the safety
function or subsystem. Performing a proof test at a maximum interval of T
1
is required
to keep the SIL capability valid. The same interval must be followed to keep the PL
capability (EN ISO 13849) valid. Note that any T
1
values given cannot be regarded
as a guarantee or warranty.
T
1
Mission time: the period of time covering the intended use of the safety function/device.
After the mission time elapses, the safety device must be replaced. Note that any T
M
values given cannot be regarded as a guarantee or warranty. (EN ISO 13849-1)
T
M
Potentially explosive atmosphere. Hazardous areas are divided into zones, based on
the frequency and duration of the occurrence of an explosive atmosphere. (EN/IEC
60079)
Zone
Later in this manual, the term “drive” is used to refer to drives, drive modules and inverter
modules.
Related manuals
CodeManual
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Inverter units
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Drive firmware
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Introduction 13