WEG CFW-11 User Manual page 55

Installation and Connection
3.3 SAFETY STOP FUNCTION
The inverters CFW11...O...Y... have the board SRBXX that implements Safety Stop function. Through this board it
is possible to control two safety relays (K1 and K2) that actuate directly on the power circuit, more specifically on
the IGBTs gate drivers power supply. The basic functional block diagram is shown in
The safety relays guarantee that the IGBTs remain switched off when Safety Stop function is activated, even in
case of an internal single failure. The position of SRBXX board and XC25 terminals (Safety Stop control terminals)
on the inverter is shown in
The Safety Stop function prevents the motor starting accidentally.
XC25:1 2
3
+5 V
X1:
DC+
Rectifier
X1:
R/L1
S/L2
T/L3
X1:
DC-
XC25:3 4
Note:
V1 = inverter internal voltage.
Figure 3.27 - Basic block diagram of Safety Stop function available in CFW-11 inverter series
DANGER!
The activation of the Safety Stop function does not guarantee electrical safety of the motor terminals
(they are not isolated from the power supply in this condition).
DANGER!
L'activation de la fonction d'arrêt de sécurité ne garantit pas la sécurité électrique des bornes du
moteur (elles ne sont pas isolées de l'alimentation électrique dans cet état).
3-34 | CFW-11
Figure 3.21 on page
SR1
V1
S1
K1
Gate
S2 driver
circuit
DC Link
capacitors
Gate
+5 V
S1
driver
circuit
K2
V1
S2
3-29.
Control circuit (Microcontroller+EPLD)
Gate
driver
circuit
Gate
driver driver
circuit circuit
Figure 3.27 on page
XC1
SR2
Digital (Relay)
outputs
Gate
driver
circuit
X1
U/T1
V/T2
W/T3
Gate
3-34.
Motor