ABB ACS880 Series, Руководство пользователя

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Option description and instructions 17
When safety pulse encoders are used, ABB installs the FSO-21 and FSE-31 modules and
the wirings between the FSO modules and the inverter units at the factory.
The user must wire the safety pulse encoders to the FSE modules on site. Obey these
rules:
•
Use a double-shielded, twisted pair cable.
•
The maximum allowed cable length between the safety pulse encoder and the FSE
module is 300 m (980 ft).
For more information, see FSE-31 pulse encoder interface module user’s manual
(3AXD50000016597 [English]).
Use of the safety function

Activating
Switch off the POUS switch.

Resetting
You do not need to push any reset button to restore to normal operation after deactivating
the POUS function. The reset input in the FSO module is set to auto reset mode at the
factory. However, you must reset the inverter units if they have tripped on fault at the
activation of the POUS function. The reaction of the inverter units depends on parameter
settings. See chapter
Parameter settings on page 19 .
POUS indications
When the POUS function is active:
•
the POUS indication lamp is on.
The indications that the FSO module generates are configurable. For more information,
see chapter
Parameter settings on page 19 and chapter Fault tracing in the FSO module
user’s manual.
Fault reaction function
Definition: The safety function has a ‘fault reaction function’ that attempts to bring the
systems to a safe state if it detects any failure within the safety system:
•
a short or open circuit or redundancy failure of the POUS switch wiring chain,
•
any internal failure within the FSO or FSE modules, the safety encoder or inverter unit
STO.
This section describes the fault reaction functions in the FSO and FSE modules, the safety
encoder and the inverter units.

FSO module
The fault reaction function of the FSO module trips the inverter unit if it detects a failure.
The FSO module activates the STO or Safe stop emergency (SSE) function. This
activates on the inverter unit STO function. The inverter unit STO function is active until the
fault has been repaired.
The FSO module goes into the Fail-safe mode. The FSO module LED STATUS/FAULT is
red until the fault has been repaired.