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Installation and Connection
3.3.2 Operation
3.3.2.1 Truth Table
STO1 Logic Level
(voltage between
XC25:1-2 terminals)
0 (0 V)
3
0 (0 V)
1 (24 V)
1 (24 V)
NOTE!
Maximum delay between signals STO1 and STO2: 100 ms (otherwise, fault F160 will occur).
The Safety Stop function has priority over the other functions of the inverter.
This function must not be used as control to start and/stop the inverter.
3.3.2.2 Inverter State, Fault and Alarm
State/Fault/Alarm
STO State
F160 fault
Safety Stop function fault
3.3.2.3 Indication of STO Status
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).
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 use the parameters P0275 (DO1), P0276 (DO2),
P0277 (DO3), P0278 (DO4) and P0279 (DO5) according to
Table 3.26: P0275...P0279 options for indication of state of inverter or faults on DOx digital outputs
DOx Digital Output function
Inverter status = STO
(Safety Stop function enabled)
Fault F160
(inverter tripped by actuation of fault of the Safety
Stop function)
Fault
(inverter tripped by the actuation of any fault)
Without fault
(inverter status is not fault)
Refer to inverter programming manual for a complete list of options for parameters P0275...P0279.
3-44 | CFW-11M G2
Table 3.24: Safety Stop function operation
STO2 Logic Level
(voltage between
XC25:3-4 terminals)
0 (0 V)
1 (24 V)
0 (0 V)
1 (24 V)
Table 3.25: State of inverter, fault and alarm related to Safety Stop function
Description
Voltage between terminals 1 and 2 (relay K1 coil) and between terminals 3 and 4 (relay
Safety Stop activated
K2 coil) of XC25 lower than 17 V
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
Safety Stop
Function
Inverter remains in STO state and does not accept
Active
commands. In order to escape this condition,
(enabled)
it's required to have STO1 = 1 and STO2 = 1
simultaneously
Inverter is tripped by F160 fault (Safety Stop
Fault
function related fault). To escape this condition,
it's required to reset the inverter
Disabled
Inverter accepts commands normally
Cause
Table 3.25 on page
Value to be Set in
P0275...P0279
33
Safety Stop function disabled:
relay/transistor OFF
Safety Stop function enabled:
relay/transistor ON
34
Without fault F160: relay/transistor OFF
With fault F160: relay/transistor ON
13
Without fault: relay/transistor OFF
With fault: relay/transistor ON
26
With fault: relay/transistor OFF
Without fault: relay/transistor ON
Inverter Behavior
3-44.
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