Installation and Operations Guide
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Hardware installation
© Honeywell. All Rights Reserved. LT-VLXEXPAXMIOG Rev. 01
27
WARNING Do not connect 24 VAC terminals to ground. This will damage the
VLX, EXP, AXM or transformer. Maintain polarity of the power connection
among all devices sharing power.
WARNING Half-wave devices and full-wave devices cannot use the same AC
transformer. Equipment damage will result. If you plan to share a transformer,
ensure that all connected devices are half-wave devices. ACMs are full wave
devices. Use dedicated transformers for all full wave devices.
VLX power
The VLX requires a 24 VAC, 50-60 Hz, 20 VA minimum power supply. Use a
UL Listed 24 VAC transformer. Transformer sharing between VLXs, EXPs, and
AXMs is allowed. Ensure that the transformer is appropriately sized for all
components it will power. See “Transformer sizing” on page 28.
Power terminals for the VLX are located on the upper right of the unit.
See “Key illustrations” on page 6 for power wiring diagrams.
Low voltage threshold A VLX will not function properly when supply power
drops below 17 VAC. The VLX can be expected to function normally when
supply power rises above 20.5 VAC.
EXP/AXM unit power
Each EXP/AXM requires a 24 VAC, 50–60Hz, 20 VA minimum power supply
for the unit only (no BOs). Use a UL Listed transformer. Transformer sharing
between EXPs/AXMs and VLXs is allowed. Ensure that the transformer is
appropriately sized for all components it will power. EXP/AXM power
consumption can range from a minimum of 10 VA to a maximum of 20 VA,
depending on the number and type of input devices connected.
WARNING Do not share VLX or EXP/AXM power with any VLC. VLCs
require an independent 24 VAC power source.
Power terminals for EXPs/AXMs are located on the upper right of the unit.
See Figure 13 on page 17 for power wiring diagrams.
Table 3 VLX powe r te rminals
Labe l De s c riptio n
24 VAC Use to te rminate the hot le g of the 24 VAC circuit. Can also be jumpe re d to
24 VAC te rminal on other EXPs /AXMs for transforme r sharing. DO NOT
CONNECT THIS TERMINAL TO GROUND. EQUIPMENT DAMAGE WILL
RESULT.
GND Use to te rminate the grounde d leg of the 24 VAC circuit. Can also be
jumpered to GND te rminal on other EXPs /AXMs for trans forme r s haring.
Onboard conne ction to GND lug.
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