State Of Inverter, Fault And Alarm Related To Safety Stop Function; Sto Status Indication - WEG CFW-11 Guía De Instalación, Configuración Y Operación

Safety Stop Function
NOTE!
Maximum delay between STO1 and STO2 signals: 100 ms (otherwise inverter will
be tripped by F160 fault).
Safety stop function takes priority over all other functions of the inverter.
This function should not be used as a control for starting and/or stopping the inverter.

3.2 STATE OF INVERTER, FAULT AND ALARM RELATED TO SAFETY STOP FUNCTION

Table 4: State of inverter, fault and alarm related to safety stop function
State / Fault / Alarm
STO state
F160 fault
A170 alarm (only on
CFW70x inverters with
software version V1.02
or higher)

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 is possible to program one or more digital outputs (relay or transistor) of the inverter to
indicate (1) that the safety stop function is active (inverter state = STO), (2) that the inverter is
in a fault state or (3) not, and more specifically (4) that the inverter is blocked by F160 (safety
stop function fault). For that set the parameters P0275 (DO1), P0276 (DO2), P0277 (DO3),
P0278 (DO4) and P0279 (DO5) according to
12 | CFW-11, CFW-11M, CFW70X
Description
Safety stop Voltage between terminals 1 and 2 (relay K1 coil) and between
activated terminals 3 and 4 (relay K2 coil) of XC25 lower than 17 V
Safety stop It is applied voltage to relay K1 coil (STO1) but it is not applied
function fault voltage to relay K2 coil (STO2) or vice-versa or there is a delay
of more than 100ms between one signal and the other. To solve
it, correct the external circuit that generates STO1 and STO2
signals
Safety stop Only for keypad indication purpose, this alarm is indicated in
activated CFW70x inverters when the state of inverter is switched to STO
Cause
Table 5 on page 13.