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Crestron Commercial Lighting Design Guide Control Processors
Doc 4775A 79
The Fault connector provides a dry contact closure fault
signal to notify an external control system when the PAC2
has a system fault. This output is connected to a digital
input of the backup computer. A fault is defined as the
CPU not interacting with Cresnet® for 10 seconds. The
watchdog switches back if the backup computer is
inactive for 10 seconds.
The PAC2 offers eight programmable analog and digital
inputs as well as digital outputs. There are eight normally
open relays, isolated with MOV suppression.
PAC2 Power Management & Requirements
When power requirements exceed 50 watts, additional
power supplies may be added. For example, each keypad
in the CNX-B series uses 3 watts, therefore only 15
keypads (allowing for a margin of safety) can be
connected without adding an additional power supply.
To ensure sufficient power to accommodate all the
Cresnet devices (keypads, touchpanels, shade/drape
controllers, thermostats, sensors, and other interfaces)
and to include voltage drops and wire runs, Crestron
recommends the CLX-PWS75 75-watt Cresnet power
supply module, or the C2N-SPWS300 300-watt system
power supply.
The 75-watt power supply is designed to mount in a CAEN
Automation Enclosure. A single CLX-PWS75 can
be installed in any single-width enclosure, or up to two
may be installed side-by-side in a double-width
enclosure. Four (4) Cresnet power ports are provided
on the CLX-PWS75, which may be used to supply power
directly to Cresnet devices, or connect to the external
power input ports of a PAC2 or PAC2M.
If the power needed for a hub segment exceeds the power
available from the internal supply (50 watts, maximum),
remove the jumper from the supplied 3-pin mini
connector to disconnect the internal power supply, then
connect the 24VDC and ground wires from an external
source (Crestron 24 VDC - regulated power supply) to the
EXT and G pins.
The 300-watt power supply, specifically designed for
large Cresnet control systems, operates with an input of
100 to 240 VAC, 4A (maximum) and a noise rating less
than 150mV. The C2N-SPWS300 provides regulated 24
VDC, 300-watts to Cresnet system components. The C2N-
SPWS300 is capable of delivering a nominal 75 watts of
power at 24 volts DC on any of its eight channels.
The CLX-PWS75 is a 75 watt Cresnet Power Supply
Module designed to mount in a CAEN Automation
Enclosure. A single CLX-PWS75 can be installed in any
single-width enclosure, or up to two may be installed
side-by-side in a double-width enclosure. Four (4) Cresnet
power ports are provided on the CLX-PWS75, which may
be used to supply power directly to Cresnet devices, or
connect to the external power input ports of a PAC2 or
PAC2M.
Additional power supplies should not be mounted on
CAEN-UMP plates in an enclosure that contains dimmer
units because this introduces low voltage in the high
voltage section of the enclosure. If required, an extra
power supply, attached to a CAEN-UMP plate, can be
added to a separate CAEN enclosure.
Mounting the PAC2 in a double-wide enclosure
Refer to the PAC2 Operations Guide (Doc. 5941) for more detailed information.