K-System – Isolated Barriers
Mounting and Installation
2020-12
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3.2.3 Power Supply Connection
The devices are available with different supply voltages.
• 24 V DC power supply
• 115 V AC or 230 V AC power supply for applications where direct current is not available
• AC/DC wide range supply with 20 V DC to 90 V DC or 48 V AC to 230 V AC
The devices are supplied with power in various ways.
• Power supply without Power Rail, see chapter 3.2.3.1
• Power supply with Power Rail, see chapter 3.2.3.2
• Non-redundant supply with power feed module
• Redundant supply with power feed module
• Direct supply with power supply
3.2.3.1 Power Supply without Power Rail
If devices with AC or universal power supplies are used, the advantages of Power Rail
are not available.
Conventional power supplies create complicated and expensive wiring systems.
After all isolated barriers are connected, there is a significant amount of wiring and more wiring
must be added for extra functions such as line fault detection.
Connection of KCD and KFD Devices
Connection of KFA, KFU, and KHA Devices
Connecting the Power Supply
Connect the power supply via the screw terminals or spring terminals.
Note
The supported supply voltage for each device is identified on the side plate.
Danger!
Danger to life from electric shock
Absent or insufficient insulation can result in electric shock.
Only connect supplies that provide protection against electric shock (e. g. SELV or PELV).
Danger!
Danger to life from electric shock
Working on live parts at voltages higher than 50 V AC or 120 V DC can result in electric shock.
1. De-energize the device.
2. Secure the circuit against reconnection.
3. Verify that the device is de-energized at all poles.
4. Provide protection from adjacent live parts, if present.
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