Safety Stop Function - WEG CFW11W G2 Series User Manual

3.3 SAFETY STOP FUNCTION

The CFW11WG2...O...Y... inverters have the SRB board that provides the Safety Stop function. Through this board
it is possible to control two safety relays (K1 and K2) which act directly on the power circuit, more specifically on
the power supply of the IGBT activation fiber optics. The safety relays ensure that the IGBTs remain turned off
when the Safety Stop function is activated, even in case of only one internal fault. The position of the SRB boards
and terminals XC25 (Safety Stop control terminals) on the inverter is shown in
The Safety Stop function prevents the accidental start of the motor.
SRB Board
DANGER!
The activation of the Safety Stop function does not ensure the electrical safety of the motor terminals
(which are not isolated from the power supply in such condition).
ATTENTION!
In case of multiple faults on the power circuit of the inverter, the motor shaft may turn up to 360/
(number of poles) degrees even with the activation of the Safety Stop function. That must be taken
into account in the application.
NOTE!
The Safety Stop function of the inverter is only a component of the safety system of a machine and/
or process. When the inverter and its Safety Stop function are correctly used and with other safety
components, it is possible to comply with the requirements of EN 954-1 / ISO 13849-1, Category
3 (machine safety) and IEC/EN 61508, SIL2 (safety/signaling applied to processes and systems).
Parameter P0029 indicates if the inverter identified the SRB board correctly. See Bit 9 in
for further details.
XC25
Figure 3.48: Location of the SRB board on the control rack
Installation and Connection
Figure 3.48 on page 3-41.
Table 3.24 on page 3-42
CFW-11W G2 | 3-41
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