Product Details
Product Description
Product Description
Focus on DCS, PLC, robot control system and large servo system.
Main products: various modules / cards, controllers, touch screens, servo drivers.
Advantages: supply of imported original products, professional production parts,
Fast delivery, accurate delivery time,
The main brands include ABB Bailey, Ge / fuanc, Foxboro, Invensys Triconex, Bently, A-B Rockwell, Emerson, ovation, Motorola, xyvom, Honeywell, Rexroth, KUKA, Ni, Deif, Yokogawa, Woodward, Ryan, Schneider, Yaskawa, Moog, prosoft and other brands
115 and 230 V AC. Install the fan so that it sits in the cooler area and will blow cold air against the operator panel. If the fan is mounted at the top and sucks air upwards, the fan’s ambient temperature will be higher = shorter lifespan. A good fan with a ball-bearing mounting has an expected lifespan of at least 40,000 hours (not a guaranteed lifespan) at 40 °C. This corresponds to at least 4 years of continuous use. If a thermostat is installed, the fan only needs to come on when needed. Large graphic terminals draw only one fifth of the current when the background lighting is off. The loss effect drops from e.g. 25 W to only 5 W. The operator panel’s loss effect = supply voltage x current. Virtually no power goes to external users and no loss effects due to inputs. Safety Section 7 Additional Installation Tips 50 3BSE043449R501 Safety Most of the operator panels are fed with 24 V DC. 1. If you use a power supply that meets safety standards and only feeds the operator panel, there is no problem. 2. However, if you have a 24 V unit that also feeds other units, there is reason to be cautious. 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 4 1 2 4 3 4 5355 Power supply 230 V AC to 24 V DC Power supply 230 V AC to 24 V DC Power supply 230 V AC to 24 V DC Operator panel Operator panel Operator panel +24 V +24 V +24 V 0 V 0 V 0 V 230 V AC COM1 COM100 Small controller with expansion unit Ch0 Ch1 Ch100 Ch101 Distance? Section 7 Additional Installation Tips Safety 3BSE043449R501 51 assumed that the 24 V feed is secure, for example, SELV according to EN 60950 (protection against electric shock) and UL 950. 3. 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. 4. Connect 0 V on the 24 V feed to the ground. 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. 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. Galvanic Isolation Section 7 Additional Installation Tips 52 3BSE043449R501 Galvanic Isolation The operator panel has galvanic isolation against the 24 V DC feed but no galvanic isolation between the communication ports for RS232, RS422/485 and USB. Only the Ethernet connection has galvanic isolation. When a PC is connected to the panel, the panel’s internal 0 V (GND) will be connected to the protective ground via the PC. A number of USB devices can have the shield connected together with the protective ground. Here, the panel’s 0 V (GND) is connected to the protective ground when, for example, a USB memory stick, keyboard or similar device is plugged in. If a number of units are connected that have a 0 V and a ground connection, and these are connected to various grounding points, there is a substantial risk of 5356 Internal electronic Filter DC/DC galvanic isolation 1.5 m VCC 0 V (GND) Ethernet DC/AC CFL 0 V +24 V DC RS422/485 RS232 USB USB * * * * * * * * 5357 * Operator panel Modular controller PC RS422 RS232 USB Power CPU COM COM2 Not same ground potential PC Printer * = Internal 0 V (GND) connection Section 7 Additional Installation Tips Cable and Bus Termination RS485 3BSE043449R501 53 problems. Grounding currents go through communication cables, the rear plate of the controller, and internally in the operator panel, and can cause errors. Use external units to improve communication and achieve galvanic isolation. Westermo has good industry-standard insulators that are also insulated from the 24 V DC feed. Cable and Bus Termination RS485 • Use shielded and twisted pair cable. The pair capacitance may not exceed 52.5 pF/m and area at least 0.25 mm2 (AWG 24), if you want to use the maximum transfer distance and maximum transfer speed. • 0 V, the reference voltage for communication should be included in the cabling. With two-way communication use two pairs; one pair for communication and one pair for 0 V. • The shield must be grounded at one end. The other end is usually grounded, but with longer distances or when there is a difference in the ground potential, the shield should be connected to the ground via 0.1 uF/250 V plastic capacitor to prevent ground current in the braided shield. A number of manufacturers recommend that the shield be grounded at each node. Various manufacturers have different systems for bus termination. The RS485 standard does not describe how the “Fail Safe” function would be carried out, just that the system should be able to handle the error. It is very important to make sure that the 24 V feed in the external insulation unit is not connected to one of the communication outlets. If it does not have 100% insulation against the 24 V feed, disturbances and grounding currents from the 0 V on the 24 V side will disrupt communication. Using this type of unit solves one problem but creates a larger problem! A substandard installation may work now, but problems may arise when other devices are connected.
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