WEG CFW-11, CFW-11M, CFW70X Safety Stop Function Installation And Operation Manual
Safety Stop Function
Función Parada Segura
Função de Parada de Segurança
CFW-11, CFW-11M, CFW70X
Installation, Configuration and Operation Guide
Guía de Instalación, Configuración y Operación
Guia de Instalação, Configuração e Operação
Motors | Automation | Energy | Transmission & Distribution | Coatings
Summary / Índice
ENGLISH
1. GENERAL INFORMATION ..................................................................................................5
2. INSTALLATION .....................................................................................................................8
3. OPERATION ........................................................................................................................10
3.1 Truth Table ............................................................................................................................... 10
3.2 State of Inverter, Fault and Alarm Related to Safety Stop Function .................................. 10
3.3 STO Status Indication ............................................................................................................ 11
3.4 Periodic Test............................................................................................................................ 11
4. EXAMPLES OF WIRING DIAGRAMS OF INVERTER CONTROL SIGNAL ...................12
5. TECHNICAL SPECIFICATIONS ........................................................................................13
5.1 Electrical Control Characteristics ......................................................................................... 13
5.2 Operational Safety Characteristics ...................................................................................... 13
APPENDIX .............................................................................................................................. 32
ESPAÑOL
1. INFORMACIONES GENERALES ......................................................................................14
2. INSTALACIÓN ....................................................................................................................17
3. PUESTA EN MARCHA .......................................................................................................19
3.1 Tabla-Verdad ........................................................................................................................... 19
3.2 Estado del Convertidor de Frecuencia, Fallos y Alarmas Relacionados a la Función de
Parada de Seguridad .................................................................................................................... 19
3.3 Señalización del estado de la función “Safety Stop” .......................................................... 20
3.4 Teste Periódico .......................................................................................................................20
4. EJEMPLOS DE DIAGRAMAS DE CONEXIÓN DE LAS SEÑALES DE CONTROL DEL
CONVERTIDOR ......................................................................................................................21
5. ESPECIFICACIONES TÉCNICAS .................................................................................... 22
5.1 Características Eléctricas de Control ................................................................................... 22
5.2 Características de Seguridad Operacional .......................................................................... 22
ANEXO .................................................................................................................................... 32
PORTUGUÊS
1. INFORMAÇÕES GERAIS .................................................................................................. 23
2. INSTALAÇÃO ..................................................................................................................... 26
3. COLOCANDO EM FUNCIONAMENTO ........................................................................... 28
3.1 Tabela-Verdade ....................................................................................................................... 28
3.2 Estado do Inversor, Falha e Alarme Relacionados à Função de Parada de Segurança .28
3.3 Indicação do Estado da Função Safety Stop....................................................................... 29
3.4 Teste Periódico .......................................................................................................................29
4. EXEMPLOS DE ESQUEMAS DE LIGAÇÃO DOS SINAIS DE CONTROLE DO
INVERSOR ............................................................................................................................. 30
5. ESPECIFICAÇÕES TÉCNICAS .........................................................................................31
5.1 Características Elétricas de Controle ................................................................................... 31
5.2 Características de Segurança Operacional ......................................................................... 31
ANEXO .................................................................................................................................... 32
Safety Stop Function
CFW-11, CFW-11M, CFW70X | 5
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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.
Control Circuit (Microcontroller+EPLD)
Gate
Driver
Circuit
Gate
Driver
Circuit
XC25:1
XC25:3
2
V1
V1
S1
S1
K1
K2
S2
S2
+5V
+5V
4
PWM1
PWM3
PWM5
Rectifier
DC Link
Capacitors
Gate
Driver
Circuit
Gate
Driver
Circuit
Gate
Driver
Circuit
Gate
Driver
Circuit
Digital (Relay)
Outputs
XC1
X1
X1:
X1:
X1:
DC+
DC-
U/T1
R/L1
V/T2
S/L2
Motor
W/T3
T/L3
SR1
PWM6
PWM4
PWM2
SR2
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 CF W70x
inverter series
Safety Stop Function
6 | CFW-11, CFW-11M, CFW70X
English
Safety stop function prevents the motor starting accidentally.
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.
NOTE!
Inverter safety stop function is only one component of the safety control system of a
machine and/or process. When inverter and its safety stop function is correctly used
and with other safety components, it’s possible to fulfill the requirements of standard
EN 954-1 / ISO 13849-1, Category 3 (machine safety) and IEC/EN 61508, SIL2 (safety
control/signalling applied to processes and systems).
XC25
XC25
(a) CFW-11 and CFW70x frame A inverters –
SRB1A.00 board
(b) CFW-11 frame B and C inverters –
SRB2A.00 board
XC25
XC25
(c) CFW70x frame B and C inverters – SRB2A.00
board
(d) CFW-11 frame D and E inverters and
CFW-11M (UC11) inverters – SRB2A.00 board for
200...240 V / 220...230 V and 380...480 V models
and SRB4.00 for 500...690 V models
Figure 2: SRBXX board (safety stop function)
Safety Stop Function
CFW-11, CFW-11M, CFW70X | 7
English
XC25
XC25
(e) CFW70x frame D and E inverters –
SRB2A.00 board for 200...240 V / 220...230 V and
380...480 V models and SRB4.00 for 500...600 V
models
(f) CFW-11 frame F and G inver ters –
SRB3.00 board
Figure 2 (cont.): SRBXX board (safety stop function)
Bit 9 of parameter P0029 content shows if the inverter have identified correctly SRBXX board.
Refer to table 1 for further information.
Table 1: Content of P0029 parameter
Bits
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 0 0 = With
braking
IGBT
1 =
Without
braking
IGBT.
0 0 = control circuit
is supplied from an
external +24 Vdc
power supply
1 = control circuit
is fed by the
inverter SMPS.
0 = Inverter
without
safety stop
option
1 = Inverter
with safety
stop option.
0 =
Inverter
without
RFI filter
1= Inverter
with RFI
filter.
Voltage rating of
the inverter:
00 = 200...240 V
/ or 220/230 V
01 = 380...480 V
10 = 500...600 V
11 = 500...690 V
or 660/690 V
Inverter output rated
current.
Hexadecimal
digit #4
Hexadecimal
digit #3
Hexadecimal
digit #2
Hexadecimal
digit #1
Safety Stop Function
8 | CFW-11, CFW-11M, CFW70X
English
2. INSTALLATION
Table 2: XC25 terminals (safety stop terminals) signals
XC25 terminals Function Specifications
1 STO1
Terminal 1 of
safety relay K1 coil.
Coil rated voltage: 24 V, range: 20…30 Vdc
Coil resistance: 960 Ω ± 10 % @ 20 °C (68 °F).
2 GND1
Terminal 2 of
safety relay K1 coil.
3 STO2
Terminal 1 of
safety relay K2 coil.
Coil rated voltage: 24 V, range: 20…30 Vdc
Coil resistance: 960 Ω ± 10 % @ 20 °C (68 °F).
4 GND2
Terminal 2 of
safety relay K2 coil.
NOTE!
XC25:2 and XC25:4 terminals are not connected internally to inverter +24 V power supply
reference. In most of cases, those terminals are connected to XC1:11 control terminal in
CFW-11 and CFW-11M inverters and to XC1:36 in CFW70X inverters.
NOTE!
Follow the instructions provided on item 3.2.5 (CFW-11 and CFW70x) or 3.4.8
(CFW-11M) of User’s Manual.
For XC25 control cabling consider the following:
Use wire gauge from 0.5 mm
2
(20 AWG) to 1.5 mm2 (14 AWG) and maximum tightening torque
of maximum 0.50 N.m (4.50 lbf.in).
Use shielded cables connected to ground only on inverter side (use the provided metallic pieces
as shown on figure 3).
Run the cables separated from the remaining circuits (power, 110 V/220 Vac control, etc.).
Safety Stop Function
CFW-11, CFW-11M, CFW70X | 9
English
Figure 3: Example of connection of shielding of control cable (in this case it was presented an example of
cables connected on XC1 terminals, but the same applies to XC25 terminals)
If the degree of protections of the used inverter is lower than IP54, it must be installed inside an
IP54 (minimum) cabinet.
Safety Stop Function
10 | CFW-11, CFW-11M, CFW70X
English
3. OPERATION
3.1 TRUTH TABLE
Table 3: Safety stop function operation
STO1 logic level
(voltage between
XC25:1-3
terminals)
STO2 logic level
(voltage between
XC25:2-4
terminals)
Safety stop
function
Inverter behavior
0 (0 V) 0 (0 V)
Activated
(enabled)
Inverter remains in STO state and does not
accept commands. In CFW70x inverters with
software version V1.02 or higher, it’s indicated
A170 (activation of safety stop function advice)
on the keypad. In order to escape this condition,
it’s required to have STO1 = 1 and STO2 = 1
simultaneously.
0 (0 V) 1 (24 V)
Fault
Inverter is tripped by F160 fault (safety stop
function related fault). To escape this condition,
it’s required to reset the inverter.
1 (24 V) 0 (0 V)
1 (24 V) 1 (24 V) Disabled Inverter accepts commands normally.
NOTE!
Maximum delay between STO1 and STO2 signals: 100 ms (otherwise inverter will be
tripped by F160 fault).
Safety stop function takes priority over all other functions of the inverter.
This function should not be used as a control for starting and/or stopping the inverter.
3.2 STATE OF INVERTER, FAULT AND ALARM RELATED TO SAFETY STOP FUNCTION
Table 4: State of inverter, fault and alarm related to safety stop function
State / fault / alarm Description Cause
STO state Safety stop
activated
Voltage between terminals 1 and 3 (relay K1 coil) and between
terminals 2 and 4 (relay K2 coil) of XC25 higher than 17 V.
F160 fault Safety stop
function fault
It’s applied voltage to relay K1 coil (STO1) but it’s not applied
voltage to relay K2 coil (STO2) or vice-versa or there is a delay
of more than 100ms between one signal and the other. To solve
it, correct the external circuit that generates STO1 and STO2
signals.
A170 alarm (only on
CFW70x inverters with
software version V1.02
or higher)
Safety stop
activated
Only for keypad indication purpose, this alarm is indicated in
CFW70x inverters when the state of inverter is switched to STO.
Safety Stop Function
CFW-11, CFW-11M, CFW70X | 11
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3.3 STO STATUS INDICATION
State of the inverter is shown on the left upper side of the display of the keypad of CFW-11 and
CFW-11M series, on the mid upper region of keypad of CFW70x series (not all states of the inverter
are indicated on the keypad of CFW70x) and in parameter P0006.
Possible states of the inverter: ready, run (inverter enabled), undervoltage, fault, self-tunning,
configuration, DC braking and STO (safety stop function activated).
It’s possible to set one or more digital and relay outputs of the inverter to indicate that safety stop
function is activated (state of the inverter = STO), if the inverter is or not on a fault state and more
specifically if the inverter was tripped by F160 fault (safety stop function fault). For that set the
parameters P0275 (DO1), P0276 (DO2), P0277 (DO3), P0278 (DO4) and P0279 (DO5) according
to table 5.
Table 5: P0275...P0279 options for indication of state of inverter or faults on DOx digital outputs
DOx digital output function
Value to be set
on P0275...P0279
Comment
CFW-11 and
CFW-11M
CFW70x
State of the inverter = STO
(safety stop function activated).
33 30 Safety stop function disabled:
relay/transistor OFF.
Safety stop function activated:
relay/transistor ON.
F160 fault
(inverter tripped by safety stop
function fault actuation).
34 31 Without F160 fault: relay/transistor OFF.
With fault F160: relay/transistor ON.
Fault (inverter tripped by
actuation of any fault).
13 13 Without fault: relay/transistor OFF.
With fault: relay/transistor ON.
Without fault
(state of the inverter is not fault).
26 24 With fault: relay/transistor OFF.
Without fault: relay/transistor ON.
Refer to CFW-11 inverter programming manual for a complete list of options for parameters
P0275...P0279.
3.4 PERIODIC TEST
Safety stop function, alternatively safety stop inputs (STO1 and STO2), must be activated at least
once a year for preventive maintenance purposes. Inverter power supply must be switched off
and then on again before carrying out this preventive maintenance. If during testing the power
supply to the motor is not switched off, safety integrity is no longer assured for the safety stop
function. The drive must therefore be replaced to ensure the operational safety of the machine or
of the system process.
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