8-14 Bc Controller Maintenance Instructions - Mitsubishi Electric HP120TNU-A Service Handbook

[8-14 BC Controller Maintenance Instructions ]

8-14 BC Controller Maintenance Instructions

1. Service panel
Work procedure
<KB type, J type, and 4-, 6-, 8-branch types>
1) Remove the control box by unscrewing the four fixing
screws. (Figure 1)
2) Unscrew the four service panel fixing screws. (Figure 2)
3) Remove the top panel by unscrewing the nine fixing
screws. (Figure 2)
<For J-type, 12- and 16-branch types, JA-type, and KA-type>
1) Remove the service panel (1) by unscrewing the two fix-
ing screws. (Figure 3)
2) Remove the control box by unscrewing the four fixing
screws. (Figure 3)
3) Remove the top panel by unscrewing the 10 fixing
screws. (Figure 4)
4) Remove the service panel (2) by unscrewing the two fix-
ing screws. (Figure 4)
2. Control box
Work procedure
(1) To check the inside of the control box, re-
move the two lock nuts on the control box
cover.
1) Check the terminal connection of the power wire or of
the transmission line.
2) Check the transformer.
3) Check the address switch.
(2) When the control board is replaced, the
followings must be noted.
(1) Check that the board type is J1, JA1, or KA1.
(2) Check that the wire and the connector are
properly connected.
It is not required to remove the two fixing screws on the
control box when checking the inside.
HWE18220_GB
*Special care must be taken when replacing heavy parts.
Explanatory figure
Ceiling panel
(Figure 1)
(Figure 2)
Control Box
(Figure 3)
Ceiling panel
Service panel (2)
(Figure 4)
Explanatory figure
Power supply
terminal block Transformer
Terminal block for Relay board
transmission line
CMB-P1016NU-J1, JA1, KA1
Control Box
Service panel
Service panel (1)
BC controller board
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chapter 8 -