Power Options
The PAC2M can be powered via the 2-pin PWR connector or by an external
power pack (such as the PW-2420RU, sold separately) but not by both.
Using the PW-2420RU, the PAC2M can provide power to peripheral
Cresnet® devices (via the built-in Cresnet Hub/Repeater) up to a total of
45 Watts. If additional power is needed, Crestron recommends the
CNPWS-75, 75-Watt external power supply (sold separately).
Install the Bussing Strip
The PAC2M is supplied with a brass bussing strip to facilitate commoning
(linking) of multiple terminal block connections. The bussing strip is
constructed with four terminal block positions and may be trimmed to
size for various applications or different devices.
To utilize the bussing strip:
1. Determine the number of relays to be commoned for the equipment
being installed. If less than four, the strip can be trimmed to size with a
pair of scissors or wire snips.
2. Loosen the terminal block screws and insert the first leg of the bussing
strip into the first common position of the terminal block. The strip
engages the other common positions automatically.
3. Remove approximately 1/8 in. of the jacket from the common wire and
insert the conductor into one of the terminal block common positions.
Tighten the terminal block screws to lock the wire and bussing strip in
place. Insulate the strip by folding a piece of 3/4 in. wide vinyl electrical
tape over the spine and as much of the individual legs as possible.
Excess tape at each end of the strip should be pressed closed, then
trimmed to within approximately 1/16 in. of the end of the strip.
4. When wiring the remaining conductors, remove approximately 1/8 in.
of the jacket and insert the wires into the proper terminal block
positions. To prevent the possibility of electrical shorts, it is essential
that these conductors do not touch any uninsulated portion of the
bussing strip.
5. Securing a tie wrap around the bussing strip is a useful way to provide
strain relief for the wires connected to the terminal block.
3
PAC2M
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Professional Automation Mini Control System for CAEN Automation System Enclosures
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