Safety. BeiJer T21C
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BeiJer T21C is an advanced operator panel designed to satisfy the demands of human-machine communication and featuring a multitude of functions, including displaying and controlling text, dynamic indication, time channels, alarm and recipe handling, making it a versatile solution for various industrial applications.
As an object-oriented device, BeiJer T21C is easy to understand and use, and its configuration is carried out on a PC using the iX Developer configuration tool, which enables maximum customization and flexibility.
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Additional Installation Tips
7.5 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, MAEN084D
30
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Table of contents
- 4 1 Safety Precautions
- 4 General
- 4 During Installation
- 5 During Use
- 5 Service and Maintenance
- 5 Dismantling and Scrapping
- 5 Appearance of Air in Touch Screen
- 6 2 Installation
- 6 Space Requirements
- 7 Installation Process
- 9 Connections to the Controller
- 9 Other Connections and Peripherals
- 10 3 Hardware Replacement
- 10 Replacing the Fan and Filter
- 12 Replacing the 2.5” SATA Mass Storage
- 14 Replacing a CompactFlash or CFast Memory Card
- 15 Replacing the Battery
- 16 4 Technical Data
- 18 5 Chemical Resistance
- 18 Metal Casing
- 19 Touch Screen and Overlay
- 19 Autotex F
- 20 Touch Screen Surface
- 20 Autotex
- 21 6 Operator Panel Drawings
- 21 Connectors
- 21 Communication Ports
- 23 iX T21C Outline
- 25 7 Additional Installation Tips
- 25 Grounding the Operator Panel
- 26 Ethernet Connection in the Operator Panel
- 28 To Achieve Better EMC Protection
- 29 Ambient Temperature
- 30 Safety
- 31 Cable and Bus Termination RS
- 32 Boot Priority
- 32 Entering BIOS
- 33 Reset Switch