Safe Torque Off - Delta VP3000 Series User Manual

3-5 Safe Torque Off

3-5-1 Basic Function
The VP3000 series provide a Safe Torque Off (STO) function, through the dual-channel STO_1 and
STO_2 signal input to turn off the IGBT switching, prevent the motor from generating torque, so as to
achieve the purpose of safe stop. Refer to Figure 3-43 for STO circuit diagram.
VP3000 STO function comply with the following regulations:
⚫ ISO 13849-1:2015 Category 3 PL e
⚫ IEC 61508 SIL3
⚫ EN 62061 SIL CL 3
⚫ EN 60204-1 Category 0
SA24V_2
Power Supply
LM76002
STO Channel 1
S24V
STO_1
STO Channel 2
STO_2
SCM
3-5-2 STO Failure Rate
Refer to the table below for the safe parameters of STO function:
Item
Safe Failure Fraction
S.F.F
STO Failure Rate
HFT (Type A
Hardware Fault Tolerance
subsystem)
SIL Safety Integrity Level
PFH Average frequency of dangerous failure [h-1] IEC61508
PFD Probability of Dangerous Failure on Demand
av
Category Category
PL Performance level
SA5V
IPH901
Enable
IPH902
Gate buffer
IU250
Diagnostic
IPH903
Diagnostic
IPH904
Figure 3-43
Definition
Chapter 3 Electrical Wiring｜VP3000
SA5V
VP3000
Power Supply
LM76002
SS5V
VCC
Gate
OPTO/OPTO
Gate Driver by
different frame
PWM signals
Standard
IEC61508
IEC61508
IEC61508
IEC62061
IEC61508
ISO13849-1
ISO13849-1
99
SA3V3
IGBT
SA3V3
PWM signals
Safety-TP1
MCU
Safety-TP2
Performance
≥ 90%
1
SIL 3
SILCL 3
10 ≤ x < 10
-4 -3
10 ≤ x < 10
-8 -7
Category 3
e
Motor