Analog Inputs Terminal Block (J8); Binary Inputs Terminal Blocks (J9 And J10); Binary Outputs Terminal Blocks; Rs-485 Communications Module - Daikin MicroTech II Installation And Maintenance Manual

Analog Inputs Terminal Block (J8)

The auxiliary control board receives up to six analog input
signals via the AI (J8) terminal block on the right side of the
board.
Note – These analog inputs are only used on the ERB1
application. Refer to "Analog Inputs—Auxiliary Control
Boards (CCB1, CCB2, GCB1, EHB1 & ERB1)" on page
23 for details regarding analog inputs.

Binary Inputs Terminal Blocks (J9 and J10)

The auxiliary control board receives up to 12 binary input
signals via the BI (J9 and J10) terminal blocks on the right side
of the board. BI1 through BI6 are located on terminal block J9
and BI7 through BI12 are located on terminal block J10. Refer
to "Binary Inputs—Auxiliary Control Boards (CCB1, CCB2,
GCB1, EHB1 & ERB1)" on page 23 for details regarding
binary inputs.

Binary Outputs Terminal Blocks

The auxiliary control board includes nine binary output relays
(BO1 through BO9) that are energized based on commands
received from the MCB. These relays provide the appropriate
switching actions for the control devices that are wired to them
through the BO terminals on the left side of the board. Refer to
"Binary Outputs—Auxiliary Control Boards (CCB1, CCB2,
GCB1, EHB1 & ERB1)" on page 26 for details regarding
binary outputs.

RS-485 Communications Module

Each auxiliary control board is equipped with a plug-in
RS-485 Communication module. This module includes a
three-position terminal block with terminals labeled N2+, N2-
and REF. These terminals are wired to the +, - and REF
terminals on the RS-485 communication terminal block on the
MCB. The auxiliary control board exchanges information with
the MCB via this interface.
Each auxiliary board RS-485 Communication module includes
an 8-position dip switch assembly (SW1) for addressing the
board. Refer to Figure 6 on page 8. The CCB1 must always be
set to address 2, the CCB2 to address 3, the GCB1 to address
5, the EHB1 to address 4 and the ERB1 to address 6. This is
done by setting the switches on each of the auxiliary control
boards as indicated in Table 4. If the switches are not set as
indicated, the MCB will not communicate correctly with the
board and it will not function properly.
Daikin IM 696-4
Table 4: Auxiliary control board address switches
Auxiliary
control board
1 2
(address)
CCB1 (2) Up Down
CCB2 (3) Down Down
EHB1 (4) Up Up
GCB1 (5) Down Up
ERB1 (6) Up Down Down

Power Supply Terminals (J1)

Either transformer T9 (CCB1 and CCB2) or T3 (GCB1,
EHB1, and ERB1) supplies 24 VAC power to terminal block
J1, terminals 1 (24VAC) and 2 (COM) on the auxiliary control
board.

J7 Terminal Block

The J7 terminal block located at the top of the auxiliary control
board is not used in this product application.

J2 Terminal Block

The J2 terminal block located between the J10 and J8 terminal
block on the right side of the auxiliary control board is not
used in this product application.

Main Control Board (MCB) Output Relays and Triacs

Binary outputs BO1 through BO4, BO11, and BO12 control
pilot duty Form C electromechanical relays mounted on the
MCB. The output terminals of these relays are connected to a
set of binary output terminal blocks located right side of the
MCB. These relays are designed for Class 2 operation and to
switch loads with either of the following characteristics:
• 5VDC @ 10 mA minimum, 1 A maximum
• 30 VAC @ 2 A nominal, 10 A inrush
Binary outputs BO5 through BO10 and BO13 through BO16
control triacs mounted on the MCB. The output terminals of
these triacs are connected to a binary output terminal block
located on the right side of MCB. These triacs are designed to
switch loads with either of the following characteristics:
• 20 mA minimum, 24 VAC @ 1 A maximum (with a total
load current from all triacs not to exceed 2.8 A, TBV).
General Description
Dip switch #
3 4 5 6
Up Up Up Up Up
Up Up Up Up Up
Down Up Up Up Up
Down Up Up Up Up
Up Up Up Up
7 8
Up
Up
Up
Up
Up
9