Technical Specifications; Electrical Control Characteristics; Operational Safety Characteristics - WEG CFW-11 User Manual

Circuit operation of SS1 function from
In this case, when the activation command is given to the external safety relay, safety relay opens inverter DI2
signal (via terminals 23 to 24) and motor is decelerated first by the inverter (via deceleration ramp). When
the time delay set at the external safety relay expires (this delay must be higher than required time to stop the
motor, taking into account deceleration time set on the inverter and inertia of the motor load), the safety relay
delayed contacts (terminals 47 to 48 and 57 to 58) opens inverter STO1 and STO2 signals and the inverter
Safety Stop function is activated. The motor stops according to category 1 (SS1) of standard IEC/EN 60204-1.
In order to drive the motor again, it is required to apply STO1 and STO2 signals again (to close terminals 13
to 23 and 23 to 24) and apply a pulse on inverter DI1 input (START).

3.3.4 Technical Specifications

3.3.4.1 Electrical Control Characteristics

Safety Stop function inputs XC25:1-2, XC25:3-4
External safety relay General requirements IEC 61508 and/or EN 954-1 and/or ISO 13849-1
specifications (only when SS1
Output requirements
function is required according
to IEC/EN 61800-5-2 and
IEC/EN 60204-1 standards)
refer to Figure 3.28 on page
Example
3-38

3.3.4.2 Operational Safety Characteristics

Protection Of the machine
Of the system process Safety Stop function which forces stopping and/or prevents the motor from restarting
Figure 3.28 on page 3-38:
2 independent inputs for Safety Stop function
Power supply: 24 Vdc (max. 30 V)
Impedance: 960 Ω
State 0 if < 2 V, state 1 if > 17 V
Number of current paths: 2 independent paths (one for each STO path)
Switching voltage capability: 30 Vdc per contact
Switching current capability: 100 mA per contact
Maximum switching delay between contacts: 100 ms
Type/manufacturer: WEG/ Instrutech CPt-D
Safety Stop function which forces stopping and/or prevents the motor from restarting
unintentionally, conforming to EN 954-1 / ISO 13849-1 category 3, IEC/EN 61800-5-2
and IEC/EN 60204-1
unintentionally, conforming to IEC/EN 61508 level SIL2 and IEC/EN 61800-5-2
Installation and Connection
CFW-11 | 3-39
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