System Power Supply Crestron C2N-SPWS300
2 • System Power Supply: C2N-SPWS300 Operations Guide - DOC. 8190
Powering the Unit
NOTE: The C2N-SPWS300 is shipped with two power cable assemblies. One is
supplied for standard 120 VAC, 60 Hz as available in the United States. The other
has three un-terminated wires at one end and is supplied for international use or
installation within the Crestron CAEN.
Attach the correct cable assembly, connect it to AC power, and set the power switch
on the left side of the unit to either the PWR ON or PWR OFF SLAVE position.
Either position is capable of enabling the internal 300-watt power supply. Select one
position over the other based on the type of control required. For example, for a large
system with power supplies scattered throughout, it may be advantageous to
implement the PWR OFF SLAVE position so that a single switch at the head end can
execute a system-wide cold boot. Otherwise, one would have to turn off a switch at
each power supply in the PWR ON position.
PWR ON Position
In the PWR ON position, the C2N-SPWS300 acts as a stand-alone system. All of the
green LEDs illuminate successively as power is applied to each channel (1 through
8) until all eight channels are powered up.
NOTE: Successive start up minimizes load current inrush current strain on the
internal 300-watt supply.
If the green LEDs do not illuminate, press and release the system RESET button.
PWR OFF SLAVE Position
In the PWR OFF SLAVE position, 24 VDC must be applied across the outer two
pins (24 and G) of the NET connector located in the upper right corner to enable the
internal supply. Once enabled, the green LEDs illuminate successively as power is
applied to each channel (1 through 8) until all eight channels are powered up.
When the power switch is in this position, 24 VDC from the Cresnet network is used
to activate a relay, which in turn switches on the internal 24 VDC supply. If Cresnet
power is removed, the C2N-SPWS300 turns off.
Channel Details
Each channel contains an electronic circuit breaker that detects over current faults for
that channel. The electronic breakers are activated if the output power exceeds 75
watts nominally, but are guaranteed to always trip before output power reaches 100
watts. Each channel has 4-amp fuses to provide an additional means of limiting
current. The fuses are not accessible to the user.
When an over current fault has occurred on a channel, the red overload LED
(OVRLD) on the front panel illuminates. The micro-controller attempts to
automatically turn on each faulted channel twice before shutting off the channel and
illuminating the red LED. At this point only pressing the RESET button associated
with each channel allows the microcontroller to turn off the red OVRLD LED and to
attempt to turn on the channel. In the event that the over current fault has been
removed the channel powers up. If an overload is still present, the micro-controller
attempts to turn on the channel an additional two times before the red LED
illuminates again. Firmware continuously monitors all channels and all channel over
current faults are reported to Cresnet.
