metso automation kajaaniMCAi, Installation, Operating & Service Manual

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kajaaniMCA i – Installation, Operating & Service
- 11.5 -
W4610201 V2.5 EN
11.C.1. Replacing the Electronics Unit (Fig. 11.2)
• Removing:
1. Switch power off from the sensor.
2. Remove the sensor sensor cover assembly.
3. Disconnect all wires from the Field Connection
Board.
4. Disconnect the antenna cables.
5. Remove the four mounting screws, located in the
corners of the Electronics Unit, and lift the unit off.
• Installing:
1. Fasten the Electronics Unit in position with the four
screws. Apply hydraulic sealing on the screws.
2. Connect the antenna cables.
3. Connect the necessary wires to the sensor’s Field
Connection Board.
4. Install the sensor sensor cover assembly back.
5. Switch operating power on.
11.C.2. MCA
i
- FT antenna cables ( Fig. 11.2)
NOTE: With the unflanged sensor models FT-150 and FT-
200, disconnecting or connecting the antenna cables
requires a PROCESS SHUTDOWN because the pin bolts
next to the antenna cables must be removed!
• Removing:
1. Models FT 150 & FT 200: Remove the three pin
bolts next to the antenna cable.
2. Open the four mounting screws of the antenna cas-
ing, and take the casing off.
3. Detach the microwave connector from the antenna.
4. Unscrew the bushings of the protective casing (at-
tached to sensor electronics bottom plate) and
slide them downwards.
5. Remove the sensor sensor cover assembly.
6. Carefully lift the antenna cable from its mounting
groove on the sensor body, at the antenna end. Do not
bend the cable any more than necessary.
7. Unscrew the microwave connector of the antenna
cable from the Electronics Unit, and push the antenna
cable out of the antenna casing.
NOTE: Do NOT try to remove the bushing from the
antenna cable!
• Installing:
NOTE: When tightening the connectors, only use the
special torque spanner provided for this purpose!
1. Push the antenna cable through the hole on the
bottom plate, and screw the microwave connector
to the bottom plate.
2. Apply a very small amount of some mild locking
glue on the exposed threads, e.g. using the tip of a
thin screwdriver.
3. Tighten the microwave connector with the torque
spanner to its final tightness.
4. Press the antenna cable into its mounting groove on
the sensor body.
5. Install the sensor sensor cover assembly back.
6. Screw the cable’s microwave connector to the anten-
na, about halfway through.
7. Apply a very small amount of some mild locking
glue on the exposed threads, e.g. using the tip of a
thin screwdriver.
8. Tighten the microwave connector with the torque
spanner to its final tightness.
9. Place the antenna cable casing back in position and
tighten with the four mounting screws.
10. With models FT-150 & FT-200: install the pin
bolts.
11. Check sensor calibration with a calibration sample.
If necessary, perform a new calibration.
11.C.3. MCAi-FT microwave antennas (Fig. 11.2)
• Removing:
1. Disconnect the antenna cables as instructed in sec-
tion 11.C.2.
2. Open the 8 antenna mounting screws and remove the
antenna. You need a 5mm Allen key to open the
screws.
3. Keep the O-ring safe.
• Installing:
1. Place the O-ring around the antenna.
2. Place the antenna in the correct position. The notch
on the antenna flange must be aligned with the notch
on the sensor body.
NOTE: Make sure that the antennas are installed in the
correct position (i.e. with the notches well aligned)!
There is no positioner to prevent incorrect mounting.
3. Fasten the antenna in position with the 8 screws. You
need a 5mm Allen key for the screws.
4. Install the antenna cables as instructed in section
11.C.2.
5. Perform a new start-up and calibration.