General Information - WEG CFW-11 Guía De Instalación, Configuración Y Operación

1 GENERAL INFORMATION

Inverters with safety stop option have suffix Y (CFW-11 and CFW-11M inverters) or suffix Y1
(CFW70x inverters) on its nomenclature. Control units of CFW-11M with safety stop option
also have suffix Y on its name (e.g.: UC11-1340T5OYZ).
Those inverters have an additional board (SRBXX) with two safety relays (K1 and K2) that actuate
directly on the power circuit of the inverter (more specifically on the IGBT gate drivers power
supply, for further information see the figure 1) and guarantee that the IGBTs remain switched
off while safety stop function is activated, even in case of an internal single failure. The position
of SRBXX board and XC25 terminals (safety stop terminals) on the inverter is shown in figure 2.
XC25:1 2
V1
+5V
S2
X1:
DC+
Rectifier
X1:
R/L1
S/L2
T/L3
X1:
DC-
+5V
S1
V1
XC25:3 4
Notes:
V1 = inverter internal voltage.
CFW-11M (more specifically power units) do not have R/L1, S/L2 and T/L3 terminals, They are fed by a DC voltage
only, SRBXX board is located on the control unit – in this case, K1 and K2 safety relays actuate on the fiber optic
transceivers that send PWM pulses to power units (UP11-XX) for firing the IGBTs.
Figure 1: Basic block diagram of safety stop function available in CFW-11, CFW-11M and CFW70x
Safety stop function prevents the motor starting accidentally.
Control circuit (Microcontroller+EPLD)
SR1
S1
K1
Gate
driver
circuit
DC Link
capacitors
Gate
driver
circuit
K2
S2
inverter series
Gate Gate
driver driver
circuit
circuit
Gate Gate
driver driver
circuit circuit
CFW-11, CFW-11M, CFW70X | 5
Safety Stop Function
XC1
SR2
Digital (Relay)
outputs
X1
U/T1
V/T2
Motor
W/T3