Bühler technologies EGK 2A Ex, Инструкция по установке и эксплуатации, Страница: 24 / 61

EGK 2A Ex
– Close the terminal box observing the following items: No foreign objects, contaminants or moisture may be inside it. Tighten
the terminal box at a tightening torque of 4 Nm, dust- and waterproof (be sure not to crush any cables!).
– Now restart the cooler per chapter Operation and controls [> page 15]. Monitor if the cooler runs in the operating range.
7.3.3 Replacing the electronics
Note the correct voltage:
230 V: Item no.: 45 92 989 7 MC
115 V: Item no.: 45 93 989 7 MC
– Observe the warnings in chapter Maintenance [> page 19].
– De-energise (supply and status outlet) and depressurise the system.
– Loosen the four screws in the corners of the front on the black terminal box.
– Carefully lift of cover: The control elements are attached to the to the electronics with cables.
– Turn the cover and put down on the cooler. Be careful not to tension the cables.
– Disconnect all cables. Although the cables are colour coded, you should mark the conductors if you are unsure.
– Loosen the 4 screws at the top of the board. The electronics can now be removed.
– Install the new electronics using the 4 screws.
– Reconnect all wires per drawing 47/170-10-3 in the appendix; the cable colours are specified.
– Close the terminal box observing the following items: No foreign objects, contaminants or moisture may be inside it. Tighten
the terminal box at a tightening torque of 4 Nm, dust- and waterproof (be sure not to crush any cables!).
– Now restart the cooler per chapter Operation and controls [> page 15].
– Test per chapter Testing the pressure monitoring circuit [> page 20].
– Allow the cooler to operate and check if it reaches the operating range.
7.3.4 Replacing the starting capacitor
Item no.: 91 0407 0001
– Observe the warnings in chapter Maintenance [> page 19].
– De-energise (supply and status outlet) and depressurise the system.
– Disconnect gas connections.
– Remove the cooler and put in a safe location.
– Loosen the four screws in the corners of the front on the black terminal box.
– Carefully lift of cover: The control elements are attached to the to the electronics with cables.
– Turn the cover and put down on the cooler. Be careful not to tension the cables.
– Test the capacitor voltage. If defective, the capacitor may take considerably longer to discharge.
– Disconnect the capacitor cable(s), disconnect from the earth rail. (see drawing 47/170-10-3 in the appendix).
– Loosen the screw connection of the capacitor and remove the cable.
– Remove the back panel of the cooler.
– Loosen the starting capacitor retaining plate at the bottom left.
– Remove the retaining plate with the capacitors.
– Loosen the nut of the capacitor to be replaced and remove the capacitor.
– Cut the cable of the new capacitor to that of the old, but do not yet crimp on the cable lug.
– Install the new capacitor with the nut, but do not yet tighten the nut all the way
– Feed the cable(s) through the grommets of the stack.
– Slide the retaining plate and capacitor(s) into the stack.
– Attach the angle bracket. Tighten the screw connection to 1.85 Nm
– Attach the back panel with 6x M4 screws at a torque of 1.85 Nm.
– Feed the cables through the screw connections, tighten the nut with rubber ring to 6 Nm.
– Crimp the cable lug to the earth wire.
– Connect the capacitor(s) per drawing 47/170-10-3 in the appendix.
– The earth must be assembled as specified in the drawing! The screw together with the pressure piece should be screwed into
the copper rail at a tightening torque of 2.2 Nm.
22 Bühler Technologies GmbH BE450020 ◦ 01/2020