IM710 25
Controller Outputs
Binary Outputs-Main Control Board (MCB)
The main control board has 16 binary outputs that provide
unit control in responses to input conditions. Binary outputs
energize on-board electromechanical relays (BO1 through
BO4, BO11 and BO12) or triacs (BO5 through BO10 and
BO13 through BO16). Unit control devices are wired to the
relays and triacs through six output terminal blocks located
on the right side of MCB.
There are three terminals associated with each binary output.
The terminals associated with BO1 are labeled NO, 1, and
NC, the terminals associated with BO2 are labeled NO, 2,
and NC, and so forth. Each binary output has a LED associ-
ated with it that lights when the corresponding output relay
or the triac is turned on.
Each binary output has an output jumper associated with it.
The three jumper positions are: 1-SRC V (jumper on the bot-
tom two pins), 2-BRD24V (jumper on the top two pins) or 3-
OFFBRD (no jumper). Refer to Figure 12.
Figure 12: Binary Output Jumper (MCB)
When the jumper is in position 1-SRC V, 24 VAC from the
SRC 1-8 terminal (BO1 through BO8) or the SRC 9-16 ter-
minal (BO9 through BO16) is applied to the numbered ter-
minal of the associated outputs. In the case of BO1 through
BO4, BO11 and BO12, this signal is then delivered to either
the NC terminal when the corresponding output is off (out-
put relay de-energized) or the NO terminal when the corre-
sponding output is on (output relay energized). In the case of
BO5 through BO10 and BO13 through BO16, this signal is
then delivered to the NO terminal when the corresponding
output is on (triac energized). Transformer T3 from the MCB
furnishes 24 VAC to the SRC 1-8 terminal and the SRC 9-16
terminal. This jumper configuration is used when a specific
binary output is used to energize a 24 VAC pilot relay in the
unit. Refer to Table 13 on page 26 for the correct jumper
position for all the standard binary outputs.
The 3-OFFBRD (no jumper installed) configuration is not
used in this product application.
The 2-BRD24V jumper configuration is not used in this
product application.
Top
of
MCB
1 - SRC V. 2 - BRD24V
(Not Used)
3 - OFFBRD
(Not Used)
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