System Overview; Safety Function Architecture - Danfoss VLT FC 280 Operating Manual

VLT® Midi Drive FC 280
Operating Guide

6.2 System Overview

6.2.1 Safety Function Architecture

The control unit of the drive consists of:
• Control card.
• Built-in option A (supports PROFINET/POWERLINK/Ethernet IP/EtherCAT fieldbus).
• Built-in safety option B (provides safety functions).
Safe option B
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T38 Logic B
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T37 Logic A
Option
A
Control unit
Black channel
Illustration 30: Safety Function Architecture
The safety loop within the drive is dual-channel based structure. There is one dual-channel safety digital input:
• Terminal 37, safe input channel a.
• Terminal 38, safe input channel b.
• Terminal 39, dedicated GND for terminal 37 and 38.
The safety digital input can be configured as STO, SS1-t, or disabled (default) via setting parameters. If disabled, the drive does not
react with any signal on terminal 37 or 38. Terminal 37, 38, and 39 are isolated with other inputs of the drive.
There is an RJ45 port for safety fieldbus communication. The safety communication protocol can be enabled or disabled (default)
via setting parameters. If disabled, the drive ignores any safety function via fieldbus.
Safety digital input and safety fieldbus protocol are all DISABLED as factory default.
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Configure the needed safety functions correctly with MCT-10 tool before use.
Safety components are already mounted within the drive. Disassembling any part of the drive is not allowed.
If both safety digital input and safety fieldbus are enabled, STO or SS1-t can be triggered via both sources. STO has the highest
priority. SS1-t can be interrupted by STO from any trigger source.
Danfoss A/S © 2022.02
PELV
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Cross check
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N O T I C E
N O T I C E
HV
High-side
gate drive
PWM
Vdd
Diagnosis
&
control
PWM
Low-side
gate drive
Power unit
Safety Functions
UDC+
M
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