Sto Status Indication; Periodic Test - WEG CFW-11 Installation And Operation Manual

3.3 STO STATUS INDICATION

State of the inverter is shown on the left upper side of the display of the keypad of CFW-11 and
CFW-11M series, on the mid upper region of keypad of CFW70x series (not all states of the inverter
are indicated on the keypad of CFW70x) and in parameter P0006.
Possible states of the inverter: ready, run (inverter enabled), undervoltage, fault, self-tunning,
configuration, DC braking and STO (safety stop function activated).
It's possible to set one or more digital and relay outputs of the inverter to indicate that safety stop
function is activated (state of the inverter = STO), if the inverter is or not on a fault state and more
specifically if the inverter was tripped by F160 fault (safety stop function fault). For that set the
parameters P0275 (DO1), P0276 (DO2), P0277 (DO3), P0278 (DO4) and P0279 (DO5) according
to table 5.
Table 5: P0275...P0279 options for indication of state of inverter or faults on DOx digital outputs
DOx digital output function
State of the inverter = STO
(safety stop function activated).
F160 fault
(inverter tripped by safety stop
function fault actuation).
Fault (inverter tripped by
actuation of any fault).
Without fault
(state of the inverter is not fault).
Refer to CFW-11 inverter programming manual for a complete list of options for parameters
P0275...P0279.

3.4 PERIODIC TEST

Safety stop function, alternatively safety stop inputs (STO1 and STO2), must be activated at least
once a year for preventive maintenance purposes. Inverter power supply must be switched off
and then on again before carrying out this preventive maintenance. If during testing the power
supply to the motor is not switched off, safety integrity is no longer assured for the safety stop
function. The drive must therefore be replaced to ensure the operational safety of the machine or
of the system process.
Value to be set
on P0275...P0279
CFW-11 and
CFW70x
CFW-11M
33 30
34 31
13 13
26 24
Safety Stop Function
Comment
Safety stop function disabled:
relay/transistor OFF.
Safety stop function activated:
relay/transistor ON.
Without F160 fault: relay/transistor OFF.
With fault F160: relay/transistor ON.
Without fault: relay/transistor OFF.
With fault: relay/transistor ON.
With fault: relay/transistor OFF.
Without fault: relay/transistor ON.
CFW-11, CFW-11M, CFW70X | 11