Operation; Truth Table; State Of Inverter, Fault And Alarm Related To Safety Stop Function - WEG CFW-11 Installation And Operation Manual

Safety Stop Function

3. OPERATION

3.1 TRUTH TABLE

STO1 logic level STO2 logic level
(voltage between (voltage between
XC25:1-3
terminals)
0 (0 V)
0 (0 V)
1 (24 V)
1 (24 V)
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)
10 | CFW-11, CFW-11M, CFW70X
Table 3: Safety stop function operation
Safety stop
XC25:2-4 function
terminals)
Activated
0 (0 V)
(enabled)
1 (24 V)
Fault
0 (0 V)
1 (24 V) Disabled
Description
Safety stop Voltage between terminals 1 and 3 (relay K1 coil) and between
activated terminals 2 and 4 (relay K2 coil) of XC25 higher than 17 V.
Safety stop It's applied voltage to relay K1 coil (STO1) but it's 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.
Inverter behavior
Inverter remains in STO state and does not
accept commands. In CFW70x inverters with
software version V1.02 or higher, it's indicated
A170 (activation of safety stop function advice)
on the keypad. In order to escape this condition,
it's required to have STO1 = 1 and STO2 = 1
simultaneously.
Inverter is tripped by F160 fault (safety stop
function related fault). To escape this condition,
it's required to reset the inverter.
Inverter accepts commands normally.
Cause