Technical Specifications; Electrical Control Characteristics; Operational Safety Characteristics - WEG CFW-11 Installation And Operation Manual

Circuit operation of SS1 function (figures 4c and 4d):
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's required to apply STO1 and STO2 signals again (to close terminals 13 to 23 and
23 to 24) and to have a pulse on inverter DI1 input (to apply a pulse on START switch).

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 – refer
to figures 4c/4d).

5.2 OPERATIONAL SAFETY CHARACTERISTICS

Protection
NOTE!
Certification of the product is in annex.
General requirements
Output requirements
Example
Of the machine
Of the system process
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
IEC 61508 and/or EN 954-1 and/or ISO 13849-1
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.
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.
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.
CFW-11, CFW-11M, CFW70X | 13
Safety Stop Function