Appendix A: More about Class 2/PELV Wiring
This appendix explains the Class 2/PELV wiring used to carry communications between PRO AV DLC Control
Units and Wallstation Controls.
Lutron requires that you connect (daisy-chain) all PRO AV DLC Control Units, Wallstations, and Accessories with
two twisted pair for operation. If shielded wire is used, the drain wires must be connected to each other or to Ter-
minal D, if present. Drain wires should not be connected to Earth/Ground.
■
One pair is for the low-voltage power wiring that enables each PRO AV DLC Control Unit to supply power to up
to two Wallstations. Connect this twisted pair to terminals 1 (COMMON) and 2 (12VDC). Terminate the 12VDC
power to ensure that each Control Unit powers
no more than two Wallstation Controls.
■
The second pair is for a data link (up to 2000 ft. or 450 m long) that enables Wallstation Controls to
communicate with PRO AV DLC Control Units. Connect this twisted pair to terminals 3 (MUX) and 4 (MUX) of
every Control Unit and Wallstation.
Each twisted pair in the Class 2 wiring link should consist of two #18 AWG (1.0 mm
2
) stranded conductors.
■
Lutron offers a one-cable (non-plenum), low-voltage solution. Please ask for P/N GRX-CBL-
346S.
Recommended unshielded cables:
■
For non-plenum installations, use (2) Belden 9470, (1) Belden 9156, or (2) Liberty 181P/2C-EX-GRN, or
equivalent.
■
For plenum installations, use (2) Belden 82740, or equivalent.
Wallstation circuits are classified as Class 2 circuits (U.S.A) (IEC). Unless otherwise specified, the voltages do not exceed 24VAC or 15VDC. As Class 2
circuits, they comply with the requirements of NFPA 70, National Electrical Code (NEC). When installing and wiring to these Wallstations, follow all applicable
national and/or local wiring regulations. External circuits connected to input, output, RS232, DMX512, and other communication terminals of Wallstations,
must be supplied from a Listed Class 2 source.
The PRO AV DLC Control Unit Class 2 circuit is 12VDC.
EACH TERMINAL CAN ACCEPT UP TO 2 #18
AWG (1.0 mm
2
) WIRES
CLASS 2/PELV
POWER WIRING:
2: 12VDC
1: COMMON
2 TWISTED PAIRS
#18 AWG (1.0 mm
2
)
DATA LINK:
4: MUX
3: MUX
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Appendix B: Installing an External Power Supply
Use an external power supply if you need to power more than two Wallstations or Accessories from a single Control Unit or if your wire lengths exceed
maximums. Power supplies do not boost data line signals. The distance limitation for the data line is 2000 ft. (450 m).
Install an external Class 2/PELV rated 12VDC power supply as shown below. This power must be Class 2/PELV rated and be a regulated supply rated for at
least 50 mA per Wallstation on the link. It can supply power to up to 15 Wallstations, enabling you to use up to 15 Wallstations with one Control Unit.
Make sure you review the manufacturer’s instructions before installing.
Lutron 12VDC transformer for 120V applications (P/N GRX-12VDC).
PRO AV DLC CLASS 2/PELV TERMINALS
1 TWISTED PAIR
#18 AWG (1.0 mm
2
)
OR LARGER
2 TWISTED PAIR
#18 AWG (1.0 mm
2
)
OR LARGER
WALLSTATION
15 WALLSTATIONS OR ACCESSORIES (MAXIMUM)
COMMON
(+) 12VDC
1 #18 AWG (1.0 mm
2
)
TO POWER SOURCE
GRX-12VDC
IMPORTANT WIRING NOTES!
1.
Connect the +12VDC wire from the power supply to the terminal 2 connection on all Wallstations. Do not connect this wire to any PRO AV Control Units on
the link. Be sure that the terminal 1 connection is made to all Wallstations and Control Units.
2.
Lutron recommends these maximum distances from the external 12VDC power supply to the last Wallstation:
■
#18 AWG (1.0 mm
2
) wire: 300 ft. (90 m).
■
#12 AWG (2.5 mm
2
) wire: 1000 ft. (300 m).
Note that the allowable maximum distance depends on the number of Wallstations in the system. Please see Application Note W14 or consult the Lutron
Technical Assistance Hotline for more detailed information.
WALLSTATION
Содержание PAV6M-120
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