Crestron CNPWS-75 User manual

Crestron CNPWS-75 System Power Supply
Operations Guide - DOC. 8091A Contents •• i
Contents
System Power Supply: CNPWS-75 1
Description ..........................................................................................................................1
Functional Description............................................................................................ 1
Physical Description...............................................................................................1
Model Differences.................................................................................................. 1
Leading Specifications .........................................................................................................2
Setup....................................................................................................................................3
System Requirements .............................................................................................3
Network Wiring......................................................................................................3
Hardware Hookup...................................................................................................4
Problem Solving...................................................................................................................6
Troubleshooting .....................................................................................................6
Further Inquiries.....................................................................................................6
Return and Warranty Policies ...............................................................................................7
Merchandise Returns / Repair Service.....................................................................7
CRESTRON Limited Warranty............................................................................... 7

Crestron CNPWS-75 System Power Supply
Operations Guide - DOC. 8091A System Power Supply: CNPWS-75 •• 1
System Power Supply:
CNPWS-75
Description
Functional Description
The CNPWS-75 is the system power supply device for the Cresnet remote control
system (herein referred to as the Cresnet system). The CNPWS-75 operates with an
input of 100 to 250 VAC, 2.3A (maximum) and a noise rating less than 300mV. The
CNPWS-75 provides 24 VDC, 75W to Cresnet system components. The CNPWS-75
has a fuse that protects the +24 VDC output. If the network power lines are shorted,
the fuse is blown. As a result, the NET POWER LED extinguishes.
Physical Description
The CNPWS-75 is housed in a black cold-rolled painted steel box, shown on the next
page. Silk screening is applied on the front panel of the steel case. The front panel
has two four-pin network connectors for integration of the unit into the Cresnet
system. Also located on the front panel is the fuse cover (output fuse rating, 4A) and
IEC320 connector. There is only one LED (NET POWER) located on the CNPWS-
75. It illuminates when 24 volts are output from the unit to the network.
There are four rubber feet on the base of the unit for stability and to prevent slippage
when freestanding. Otherwise, the unit can be rack mounted using a CNXRMAK,
rack mount kit (sold separately).
Model Differences
There are two system power supply models available and selection depends whether
the unit is to be used in a domestic or international application. Due to the input
requirements, the supplied line cord differs for each model. The domestic unit is
known as the CNPWS-75 and the international unit is referred to as the CNPWSI-75.
For purposes of this Operations Guide, the term CNPWS-75 is used for either
configuration, except where noted.

System Power Supply Crestron CNPWS-75
2•• System Power Supply: CNPWS-75 Operations Guide - DOC. 8091A
CNPWS-75 Physical Views
Leading Specifications
The table below provides a summary of leading specifications for the CNPWS-75.
Dimensions and weight are rounded to the nearest hundredth unit.
Leading Specifications for the CNPWS-75
SPECIFICATION DETAILS
Input Power 100 VAC to 250 VAC, 2.3A (max)
Output Voltage 24 VDC
Output Fuse Rating 4A
Time Lag 125V (min)
Ripple/Noise less than 300 mV
Maximum Operating Temperature 104 degrees Fahrenheit (40 degrees Celsius)
Dimensions & Weight Height: 2.55 in (6.48 cm)
Width: 4.74 in (12.05 cm)
Depth: 8.07 in (20.50 cm)
Weight: 2.30 lb (1.10 kg)
As of the date of manufacture, the CNPWS-75 has been tested and found to comply
with specifications for CE marking.
NOTE: These devices comply with part 15 of the FCC rules. Operation is subject to
the following two conditions: (1) these devices may not cause harmful interference,
and (2) these devices must accept any interference received, including interference
that may cause undesired operation.

Crestron CNPWS-75 System Power Supply
Operations Guide - DOC. 8091A System Power Supply: CNPWS-75 •• 3
Setup
System Requirements
A CNPWS-75 is necessary to supply power to modular "card cage" control systems
(i.e., CNRACKX and CNRACKX-DP) via the central processing unit. An additional
CNPWS-75 may also be required in a Cresnet system managed by an integrated
control system (i.e., CNMSX) if the power requirements of the system components
are greater than the internal 75-watt power supply of the control system.
To determine the number of CNPWS-75s necessary to power all Cresnet components
in a particular Cresnet system, the total system power requirement must be
calculated. This is accomplished by adding the power requirements of all system
components. Refer to the leading specifications of each component for individual
power requirements. The total system power requirements should include the control
system, all cards in the control system, any expansion racks and associated cards,
and any network units. Once the total system power requirement is calculated, the
number of CNPWS-75s used should be selected such that their combined output
wattage meets or exceeds the total system power requirement.
Another important system factor to consider is the fact that a single network unit
cannot be powered by two different CNPWS-75s. In other words, one CNPWS-75,
which is not being used to its full capacity, cannot contribute its unused power to
'help' another CNPWS-75 power the network units connected to it. For example,
suppose a system consists of a CNRACKX (cards included) with a power
requirement of 20 watts and three wired panels, each with a power requirement of 20
watts. The total system power requirement is 80 watts. The first CNPWS-75 could
power the CNRACKX and two wired panels for a total of 60 watts. A second
CNPWS-75 could power the remaining wired panel for a total of 20 watts.
Network Wiring
NOTE: When making wire connections, refer to the latest revision of the Cresnet
Network Interconnect Drawing (Doc. 5411). The document can be obtained from the
Downloads page (CABLES and MANUAL Libraries) of the Crestron website
(www. crestron.com). Search for the CRESNET.PDF files.
When calculating the wire gauge for a particular network run, the length of the run
and the power requirement of each network unit to be connected must be taken into
consideration. If network units are to be daisy chained on the run, the load factor of
each network unit to be daisy chained must be added together to determine the load
factor of the entire chain. The length of the run in feet and the load factor of the run
should be used in the following resistance equation to calculate the value on the right
side of the equation.
Resistance Equation
R = Resistance (refer to table below).
L = Length of run (or chain) in feet.
LF = Load factor of entire run (or chain).
R < L x LF
40,000 Where:
The required wire gauge should be chosen such that the resistance value is less than
the value calculated in the resistance equation. Refer to the table after this paragraph.

System Power Supply Crestron CNPWS-75
4•• System Power Supply: CNPWS-75 Operations Guide - DOC. 8091A
Wire Gauge Values
RESISTANCE (R) WIRE GAUGE
416
618
10 20
15 22
13 24 (Doubled-CAT 5)
NOTE: All network wiring must consist of two twisted-pairs. One twisted pair is
the +24V conductor and the GND conductor and the other twisted pair is the Y
conductor and the Z conductor.
NOTE: When daisy chaining network units, always twist the ends of the incoming
wire and outgoing wire which share a pin on the network connector. After twisting
the ends, tin the twisted connection with solder. Apply solder only to the ends of the
twisted wires. Avoid tinning too far up or the tinned end becomes brittle and breaks.
After tinning the twisted ends, insert the tinned connection into the network
connector and tighten the retaining screw. Repeat the procedure for the other three
network conductors.
Hardware Hookup
The CNPWS-75 should be used in a well-ventilated area. The venting holes should
not be obstructed under any circumstances. If the power supply is hot to the touch,
consider using forced air ventilation or implementing additional supplies to distribute
the load.
Hookup Preparation
Prior to making hardware connections, it is assumed that all wiring is run. This
includes the connection of network connectors. However, the network connectors
should not yet be plugged into the network units. Use an ohmmeter to verify that
none of the four network conductors are shorted or crossed. Furthermore, each
network unit has its unique ID code set. If necessary, refer to the product
documentation for the appropriate ID code assignment procedure of each device.
Hookup Methods
The hookup diagram, below, illustrates the home run and daisy chain methods of
connecting the CNPWS-75. It also illustrates multiple CNPWS-75s within a single
Cresnet system. Only use the methods shown; do not connect multiple power
supplies together in parallel. If only one power supply is necessary, use either
method connected to a control system.

Crestron CNPWS-75 System Power Supply
Operations Guide - DOC. 8091A System Power Supply: CNPWS-75 •• 5
CNPWS-75 Hardware Hookup
NETWORK
UNIT
NETWORK DATA LINK
TO ADDITIONAL
EXPANSION CNPWS-75
CNPWS-75
NC
DAISY CHAIN METHOD
NETWORK
UNIT
NETWORK
UNIT
NC
CNPWS-75
POWER EXPANSION
(NETWORK DATA
LINK TO EXPANSION
CNPWS-75)
HOME RUN METHOD
CONTROL
SYSTEM
NOTE: Never connect multiple CNPWS-75s in parallel.
NOTE: Always disconnect AC power to the CNPWS-75 supplying power to a
Cresnet system before connecting a network unit to that system or installing a card in
the control system.
Hookup Procedure
1. Connect each network unit to the appropriate network connector.
2. Connect AC power to the CNPWS-75.
3. If a PC (running SIMPL Windows) is available, connect the PC to the
Cresnet system via the computer port on the control system.
4. From SIMPL Windows, select Tools | Viewport to open the Viewport.
5. Select Diagnostics | Report Network Devices (alternatively F4) to
verify that all network units are properly connected to the Cresnet
system.

System Power Supply Crestron CNPWS-75
6•• System Power Supply: CNPWS-75 Operations Guide - DOC. 8091A
Special Consideration for the CNPWSI-75
The CNPWSI-75 is shipped with an AC line cord, but no connector. When installing
a connector or connecting to AC power, connect the brown lead to live 220 VAC.
Connect the blue lead to AC neutral. Connect the green/yellow lead to AC ground.
Problem Solving
Troubleshooting
The table below provides corrective action for possible trouble situations. If further
assistance is required, please contact a Crestron technical support representative.
CNPWS-75 Troubleshooting
TROUBLE POSSIBLE
CAUSE(S) CORRECTIVE ACTION
NET
POWER CNPWS-75 is not receiving power. Verify that AC outlet is active and supplying power.
LED is not
illuminated. Fuse is blown. Refer to setup procedures in this Operations Guide and test the network for shorts. Replace fuse.
NET
POWER
LED flashes.
Cresnet power
requirements for
supply is exceeded.
Confirm load on supply. Add more power supplies
to the network, if necessary.
Network
units are not
receiving
power.
Varied. From SIMPL Windows, select Tools | Network
Analyzer and perform voltage level tests on the
troubled network unit.Refer to the SIMPL Windows
help file for details.
Further Inquiries
If after reviewing this Operations Guide, you cannot locate specific information or
have questions, please take advantage of Crestron's award winning technical support
team by calling:
•In the US and Canada, call Crestron’s corporate headquarters at
1-888-CRESTRON [1-888-273-7876] or 1-201-767-3400.
•In Europe, call Crestron International at [phone].
•In Asia, call Crestron Asia at [phone].
•In Latin America, call Crestron Latin America at [phone].
For local support from exclusive Crestron factory-trained personnel call:
•In Australia, call Soundcorp at [phone].
•In New Zealand, call Amber Technologies at [phone].