General Information - WEG CFW-11 Installation And Operation Manual

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
+5V
X1:
DC+
Rectifier
X1:
R/L1
S/L2
T/L3
X1:
DC-
+5V
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
Control Circuit (Microcontroller+EPLD)
SR1
V1
S1
K1
Gate
S2
Driver
Circuit
DC Link
Capacitors
Gate
S1
Driver
Circuit
K2
V1
S2
Gate
Gate
Driver Driver
Circuit Circuit
Gate Gate
Driver Driver
Circuit Circuit
inverter series
Safety Stop Function
XC1
SR2
Digital (Relay)
Outputs
X1
U/T1
V/T2
Motor
W/T3
CFW-11, CFW-11M, CFW70X | 5