Honeywell EXCEL 12 W7704B1002 Installation Instructions Manual page 5

•
If is displayed continuously, the Excel 12 is in the
"occupied" or "bypass" mode; if it flashes, the given mode
has been overridden.
•
If is displayed continuously, the Excel 12 is in the
"standby" mode; if it flashes, the "standby" mode has been
overridden.
•
If is displayed continuously, the Excel 12 is in the
"unoccupied" mode; if it flashes, the "unoccupied" mode
has been overridden.
NOTE: If all three of these symbols are flashing simul-
taneously, the Excel 12 is responding to a network
management "wink" command.
•
means that the Excel 12 is OFF.
•
and mean that the Excel 12 is OFF, but that "frost
protection" has been enabled.
LonWorks Communications
General Information
The Excel 12 is equipped with a free-topology transceiver
(FTT10A) for communicating on L
L W network is insensitive to polarity, eliminating the
ON ORKS
possibility of installation errors due to miswiring.
Different network configurations (daisy-chain, loop, and star
configurations, or any combination thereof) are possible (see
also Excel 50/500 L W
ON ORKS
Description, EN0B-0270GE51).
All Excel 12 controllers feature a L
service button (see section "Troubleshooting" on page 7).
Connecting to the L
ON
IMPORTANT
Do not bundle wires carrying field device signals or
LonWorks communications together with high-voltage
power supply or relay cables. Specifically, maintain a
min. separation of 3 inches (76 mm) between such
cables. Local wiring codes may take precedence over
this recommendation.
IMPORTANT
Try to avoid installing in areas of high electromagnetic
noise (EMI).
The unit must be wired to the L
IV 22 AWG (Belden part number 9D220150) or plenum-rated
level IV 22 AWG (Belden part number 9H2201504) non-
shielded, twisted-pair, solid-conductor wire. When possible,
use Honeywell AK3781, AK3782, AK3791, or AK3792 cable
(US part nos.). See Excel 50/5000 LonWorks Mechanisms,
EN0B-0270GE51, for details, including max. lengths.
Use wire with a min. size of 20 AWG (0.5 mm
2
size of 14 AWG (2.5 mm ).
The unit is connected to the L
Fig. 8 via terminal pins 3 and 4 (black screw-type T terminal
plug) underneath the terminal protection cover (if present)
located on the low-voltage side. Terminal 24 and 25 are used
to connect further devices to the L
W ® networks. The
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Mechanisms Interface
W service LED and
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W Network
ORKS
W network using level
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2
) and a max.
W network as shown in
ON ORKS
W network.
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24V 24V
~ 0
22 23
24V 24V
~ 0
1 2
24V 24V
~ 0
22 23
24V 24V
~ 0
1 2
Fig. 8. Connection to LonWorks (fixed terminals)
Depending upon the chosen network configuration, one or two
terminations (see section "L
7) may be required.
Inputs/Outputs
Wiring the Inputs/Outputs
Use a min. size of 20 AWG (0.5 mm
2
(2.5 mm ) for all input/output connections. The max. length of
all input/output cables is 1300 ft (400 m).
Two wires with a total thickness of 14 AWG can be twisted
together and connected using a wire nut (include a pigtail with
this wire group and attach the pigtail to the individual terminal
block). Deviations from this rule can result in improper
electrical contact. Local wiring codes may take precedence
over this recommendation. Wire to the terminal blocks as
follows:
1. Strip 5/16 in. (8 mm) insulation from the conductor.
2. Insert it at the required terminal location, and tighten the
screw to complete the termination. Fix the cable using
cable binders if required.
Binary Inputs
The Excel 12 is equipped with dry-contact binary inputs. The
binary inputs are fast (i.e. the signal must be stable for
25 ms). The binary inputs are therefore suitable for pro-
cessing signals which need to be handled quickly, e.g. light
switch input or sunblind UP/DOWN button. In the case of slow
signals, it is sufficient to use analog inputs, all of which can be
configured as slow binary inputs using Honeywell's LNS plug-
in.
Hardware Limits
•
In order for the software to detect that a fast binary input is
closed, the resistance of the dry contact must be less than
200 Ω.
•
In order for the software to detect that a fast binary input is
open, the resistance of the dry contact must exceed
50 kΩ.
•
Signal must be stable for a min. of 25 ms.
NOTE: Push buttons connected to the Excel 12 must be
new. Specifically, it is not allowed to use push
buttons which have already been used for 230 Vac.
5
EXCEL 12 MODULES
LON LON
1 2
24 25
Excel 12
LON LON
1 2
3 4
LON LON
1 2
24 25
Excel 12
LON LON
1 2
3 4
W Termination" on page
ON ORKS
2
) and a max. of 14 AWG
EN1B-0201GE51 R0905C