Installation and Connection
3
3-60 | CFW-11
Circuit operation of SS1 function from Figure 3.46 on page 3-59:
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 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
External safety relay
specifications (only when SS1
function is required according
to IEC/EN 61800-5-2 and
IEC/EN 60204-1 standards)
refer to Figure 3.46 on page
3-59
General requirements IEC 61508 and/or EN 954-1 and/or ISO 13849-1
Output requirements 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
Example Type/manufacturer: WEG/ Instrutech CPt-D
3.3.4.2 Operational Safety Characteristics
Protection Of the machine 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
Of the system process Safety Stop function which forces stopping and/or prevents the motor from restarting
unintentionally, conforming to IEC/EN 61508 level SIL2 and IEC/EN 61800-5-2
To Next Page
Loading...
Need help?
General
