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Additional Installation Tips
6.5 Safety
Most of the operator panels are fed with 24 V DC.
Power supply
230 V AC to 24 V DC
1
+24 V
0 V
Operator panel
4
Power supply
230 V AC to 24 V DC
Operator panel
2
+24 V
0 V
4
Distance?
3
Power supply
230 V AC to 24 V DC
4
+24 V
0 V
230 V AC
Operator panel
COM1
Small controller with expansion unit
Ch0
Ch1
COM100
Ch100
Ch101
5355
If a power supply that meets safety standards is used and only feeds the operator panel, there is no problem. See 1 in drawing above.
However, if a 24 V unit that also feeds other units is used, there is reason to be cautious, see 2 in drawing above. The operator panel does not have insulation that meets safety requirements in the event of a potential short circuit between
230 V AC and 24 V DC. It is assumed that the 24 V feed is secure, for example,
SELV according to EN 60950 (protection against electric shock) and UL 950.
Example:
Here is an example that explains why a secure 24 V DC feed can be ruined by mixing
24 V relay contacts with 230 V AC relay contacts in a smaller controller. Check that the clearances and creepage distances between 24 V DC and 230 V AC fulfill EN 60950 or
UL 950. If not, input a separate 24 V unit into the operator panel.
•
•
•
If there is a substantial distance between the relay contacts for 24 V DC and
230 V AC, it is OK to use the same 24 V devices for all feeds. See 3 in drawing above.
Connect 0 V on the 24 V feed to the ground, see 4 in drawing above. This offers three advantages:
Safety is increased. The 24 V feed will not be live in the event of a faulty connection or short circuit between 0 V (24 V) and 230 V phase.
Transients on the 24 V feed are connected to the ground.
No risk that the 24 V feed is at a high level in relationship to the ground. This is not unusual since there is high static electricity.
Beijer Electronics, MAEN017F
25
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Table of contents
- 4 1 Safety Precautions
- 4 General
- 4 UL and cUL Installation
- 6 During Installation
- 6 During Use
- 6 Service and Maintenance
- 6 Dismantling and Scrapping
- 7 Appearance of Air in Touch Screen
- 8 2 Installation
- 8 Space Requirements
- 9 Installation Process
- 11 Connections to the Controller
- 11 Other Connections and Peripherals
- 12 3 Technical Data
- 14 4 Chemical Resistance
- 14 Metal Casing
- 15 Touch Screen and Overlay
- 15 Autoflex EBA 180L
- 16 Touch Screen Surface
- 16 Autoflex EBA 180L
- 17 5 Operator Panel Drawings
- 17 Connectors
- 17 Communication Ports
- 19 iX T10A Outline
- 20 6 Additional Installation Tips
- 20 Grounding the Operator Panel
- 21 Ethernet Connection in the Operator Panel
- 23 To Achieve Better EMC Protection
- 24 Ambient Temperature
- 25 Safety
- 26 Galvanic Isolation
- 27 Cable and Bus Termination RS