Technical Specifications; Electrical Control Characteristics; Operational Safety Characteristics - WEG CFW-11 Guía De Instalación, Configuración Y Operación

Circuit operation of SS1 function
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 necessary to apply +24 V on STO1/STO2, and then press the START
button to generate a rising edge on DI1.

5 TECHNICAL SPECIFICATIONS

5.1 ELECTRICAL CONTROL CHARACTERISTICS

Safety stop function inputs XC25:1-2, XC25:3-4
External
safety relay specifications
(only when SS1 function is
required according to IEC/
EN 61800-5-2 and IEC/
EN 60204-1 standards
see (Figure 4 (c) and (d) on
page 14)

5.2 OPERATIONAL SAFETY CHARACTERISTICS

Protection
(Figure 4 (c) and (d) on page
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
General requirements IEC 61508 and/or EN ISO 13849-1
Output requirements No. 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 Manufacturer / type: WEG PSRW
Of the machine Safety stop function which brings the machine to a
defined safe state and/or prevents the motor from
restarting unintentionally, in conformance with EN
ISO 13849-1 (Cat. 3 / PL d) and IEC 61508 / EN
60204-1 / EN 61800-5-2 (SIL 2)
Of the process Safety stop function which brings the process to a
defined safe state and/or prevents the motor from
restarting unintentionally, in conformance with IEC
61508 / EN 61800-5-2 (SIL 2)
Safety Stop Function
14):
CFW-11, CFW-11M, CFW70X | 15