WEG CFW-11 User Manual - page 57
Installation and Connection
3
3-36 | CFW-11
For XC25 control cabling considers the following:
Use wire gauge from 0.5 mm
2
(20 AWG) to 1.5 mm
2
(14 AWG) and maximum tightening torque of maximum
0.50 N.m (4.50 lbf.in).
Use shielded cables connected to ground only on inverter side. Use the provided metallic pieces as shown
on
.
Run the cables separated from the remaining circuits (power, 110 V / 220 Vac control, etc.).
3.3.2 Operation
3.3.2.1 Truth Table
Table 3.11 - Safety Stop function operation
STO1 Logic Level
(Voltage Between
XC25:1-2
Terminals)
STO2 Logic Level
(Voltage Between
XC25:3-4
Terminals)
Safety Stop
Function
Inverter Behavior
0 (0 V)
0 (0 V)
Activated
(enabled)
Inverter remains in STO state and does not accept commands. In order to escape this
condition, it’s required to have STO1 = 1 and STO2 = 1 simultaneously
0 (0 V)
1 (24 V)
Fault
Inverter is tripped by F160 fault (Safety Stop function related fault). To escape this
condition, it’s required to reset the inverter
1 (24 V)
0 (0 V)
1 (24 V)
1 (24 V)
Disabled
Inverter accepts commands normally
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.
3.3.2.2 State of Inverter, Fault and Alarm Related to Safety Stop Function
Table 3.12 - State of inverter, fault and alarm related to Safety Stop function
State/Fault/Alarm
Description
Cause
STO state
Safety Stop activated Voltage between terminals 1 and 2 (relay K1 coil) and between terminals 3 and 4 (relay K2 coil)
of XC25 lower than 17 V
F160 fault
Safety Stop function
fault
It’s applied voltage to relay K1 coil (STO1) but it’s not applied voltage to relay K2 coil (STO2) or
vice-versa or there is a delay of more than 100 ms between one signal and the other. To solve it,
correct the external circuit that generates STO1 and STO2 signals
3.3.2.3 STO Status Indication
State of the inverter is shown on the left upper side of the display and in parameter P0006.
Possible states of the inverter: ready, run (inverter enabled), undervoltage, fault, self-tuning, configuration, DC
braking and STO (Safety Stop function activated).