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
TCheck the grounding of the cable current transformer (when used) If the neutral current is measured by a cable current transformer, the cable shielding should first be returned through the cable current transformer before connecting it to the ground. This enables weak ground faults currents that flow along the cable sheath to dissipate. In this way, they will not be incorrectly measured at their own relay feeder. The following shows another view of the cable current transformer grounding. REF 542plus switchbay protection and control unit Manual Part 3: Installation and Commissioning 1VTA100004-en DMS,2001-10-04 REF542plus: Installation and Commissioning 21 / 80 Cable current transformer Shielding Out-feed Secondary measurement line Figure 8: Grounding of a cable current transformer 4.2.4.2 Check the voltage transformer circuits To check that the voltage transformer and the voltage transformer circuits are wired correctly, run the following checks: Polarity check Wiring check Check the transformer circuit grounding Check the voltage transformer for neutral point-ground voltage (when used). To measure ground faults please proceed as follows: The voltage is referred to as neutral point-ground voltage of a ground fault measurement when it occurs with a metallic ground fault in the network between terminals "e“ and "n“ of the open delta winding. In the event of a metallic ground fault in phase L1, the external phase-to-neutral voltages occur in phases L2 and L3 instead of the conductor-ground voltages. They are added geometrically and yield three times the amplitude between terminals "e“ and "n“. 4.2.4.3 Checking the auxiliary voltage The auxiliary voltage must be in the tolerance range of the power supply module and have the proper polarity under all operating conditions. 4.2.4.4 Check the tripping and signaling contacts Conduct this check as shown in the bay documentation. 4.2.4.5 Check the binary inputs Check the polarity and the voltage value of the binary inputs on the REF542 in accordance with the technical data of the binary inputs. 4.2.5 Grounding of the REF542plus As can be seen in the following figure, the power supply board at connector X10 must be grounded to the housing. Therefore the middle pin must be connected to the grounding point in the LV compartment. Beside that, the shielding of the cable connection to the HMI control unit must also be connected to ground respectively to the housing.
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