Crestron CNCS Operating Manual

Crestron CNCS
AC Current Sensor
Operations Guide

This document was prepared and written by the Technical Documentation department at:

Crestron Electronics, Inc.

15 Volvo Drive

Rockleigh, NJ 07647

1-888-CRESTRON

All brand names, product names and trademarks are the property of their respective owners.

©2007 Crestron Electronics, Inc.

Crestron CNCS AC Current Sensor

Contents

AC Current Sensor: CNCS 1

Introduction ...............................................................................................................................1

Features and Functions................................................................................................ 1

Specifications ..............................................................................................................2

Physical Description.................................................................................................... 2

Industry Compliance ...................................................................................................7

Setup .......................................................................................................................................... 8

Operation ...................................................................................................................................9

POT Adjustments ........................................................................................................9

Threshold Adjustments................................................................................................ 9

CNCS Implementation .............................................................................................. 11

Contact Information and Updates............................................................................................ 12

Further Inquiries........................................................................................................12

Future Updates ..........................................................................................................12

Return and Warranty Policies.................................................................................................. 13

Merchandise Returns / Repair Service ......................................................................13

CRESTRON Limited Warranty.................................................................................13

Operations Guide – DOC. 8079D Contents • i

Crestron CNCS AC Current Sensor

AC Current Sensor: CNCS

Introduction

Features and Functions

• Measures average current of each half cycle of an AC load, up

The CNCS provides power sensing of any single AC powered device or
AC load up to 5 Amps. A current sensor is typically used with any
television, AV receiver, etc. to provide confirmation of the device's
power on/off state. This is often necessary to enable reliable power
control for IR controlled devices that do not include discrete power
commands in their IR control protocol.

The CNCS provides true power status feedback to the control system via
a pair of low-voltage contact closures, which may be connected directly
to Versiports or other digital input ports on any Crestron control system,
room box, expansion module, etc. Although the CNCS is not a Cresnet
device, it does require power (24 and G) from the Cresnet bus.

to a maximum of 5 Amps

• Full load and partial load threshold adjustability by means of a
15-turn precision potentiometer (POT)

• Mutually exclusive full load and partial load relay closures

®

Operations Guide – DOC. 8079D AC Current Sensor: CNCS • 1

AC Current Sensor Crestron CNCS

Specifications

Specifications for the CNCS are listed in the following table.

CNCS Specifications

SPECIFICATION DETAILS

Power Requirements
Cresnet Power Usage 3 Watts

(0.125 Amp @ 24 Volts DC)

Enclosure Steel, black matte powder coat

finish, freestanding

(adhesive feet included)
Dimensions
Height
Width
Depth
Weight 1.8 lb (0.8kg)

1.94 in (4.92 cm)

4.49 in (11.39 cm)

4.33 in (10.99 cm)

Physical Description

This section provides information on the connections, controls and
indicators available on your CNCS.

2 • AC Current Sensor: CNCS Operations Guide – DOC. 8079D

Crestron CNCS AC Current Sensor

CNCS Physical View

Operations Guide – DOC. 8079D AC Current Sensor: CNCS • 3

AC Current Sensor Crestron CNCS

CNCS Overall Dimensions

2

4

3

CNCS

1

FULL

LOAD

PWR

PARTIAL

LOAD

6

MAX 130V 5A 50/60Hz

AC OUTPUT

~

CW = INCREASED THRESHOLD

5

4.49 in

(11.39 cm)

OUT

F

P

24+

7

CRESTRON ELECTRONICS INC.

C

GND

C = COMMON
P = PARTIAL
F = FULL

AC INPUT

1.94 in

(4.92 cm)

MAX 130V ~ 5A 50/60Hz

8

4 • AC Current Sensor: CNCS Operations Guide – DOC. 8079D

Crestron CNCS AC Current Sensor

Connectors, Controls & Indicators

# CONNECTORS,

DESCRIPTION

CONTROLS &

INDICATORS

1

AC OUTPUT

MAX 130V 5A 50/60Hz

~

2 PWR (LED) Green LED, indicates 24 VDC

3 FULL LOAD (POT) Recessed trim pot adjusts “full

3-prong grounded AC socket,
sensed AC power outlet;

Maximum Load: 5 Amps,
130 VAC @ 50/60Hz;

Minimum Sensing Load:

0.033 Amps (4 Watts) at
120 VAC;

Voltage Range: 90 to
130 VAC@ 50/60 Hz

power supplied to unit.

load” threshold.

4 FULL LOAD (LED) Red LED, illuminates when

“full load” threshold exceeded.

5 PARTIAL LOAD (POT) Recessed trim pot adjusts

“partial load” threshold.

6 PARTIAL LOAD (LED) Yellow LED, illuminates when

“partial load” threshold
exceeded.

(Continued on following page)

Operations Guide – DOC. 8079D AC Current Sensor: CNCS • 5

AC Current Sensor Crestron CNCS

Connectors, Controls, & Indicators (Continued)

# CONNECTORS,

CONTROLS &

INDICATORS

7

OUT

F

P

24+

C

GND

DESCRIPTION

5-pin 5mm detachable terminal
block*

• 24+: DC power input,
connects to the ‘24’
terminal of the Cresnet
bus;

• F: Relay output, latches
when “full” threshold has
been exceeded;

• P: Relay output, latches
when “partial” threshold
has been exceeded;

• C: Floating common for
“F” and “P”;

• GND: Ground, connects
to the ‘G’ terminal of the
Cresnet bus;

Relay outputs rated 1 Amp @
24 Volts AC/DC, referenced to
“C”

8 AC INPUT Attached cable with grounded

AC plug;
Connects to grounded AC

power source

* Interface connector for the 24+/F/P/C/GND port is provided. The CNCS must not

be connected to the ‘Y’ or ‘Z’ terminals of the Cresnet Bus.

6 • AC Current Sensor: CNCS Operations Guide – DOC. 8079D

Crestron CNCS AC Current Sensor

Industry Compliance

As of the date of manufacture, the CNCS has been tested and found to
comply with specifications for CE marking and standards per EMC and
Radiocommunications Compliance Labelling.

NOTE: This device complies with part 15 of the FCC rules. Operation is
subject to the following two conditions: (1) this device may not cause
harmful interference and (2) this device must accept any interference
received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses
and can radiate radio frequency energy and if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:

 Reorient or relocate the receiving antenna.

 Increase the separation between the equipment and receiver.

 Connect the equipment into an outlet on a circuit different from

that to which the receiver is connected.

 Consult the dealer or an experienced radio/TV technician for help.

Operations Guide – DOC. 8079D AC Current Sensor: CNCS • 7

AC Current Sensor Crestron CNCS

Setup

Stacking

Connect the
Device

Four “feet” are provided with the CNCS to provide stability when the
unit is placed on a flat surface or stacked. These feet should be attached
prior to the hookup procedure.

Refer to the following diagram illustrating hookup connections for the
CNCS.

CNCS, Hookup Block Diagram

The CNCS is not a Cresnet device, however it does require power (24
and G) from the Cresnet bus as illustrated above.

NOTE: Partial power output may be used as the primary output if
increased sensitivity is required.

NOTE: CNCS must not be connected to the ‘Y’ or ‘Z’ terminals of the
Cresnet Bus.

8 • AC Current Sensor: CNCS Operations Guide – DOC. 8079D

Crestron CNCS AC Current Sensor

Operation

POT Adjustments

The CNCS has two mutually exclusive relay closures (labeled as FULL
LOAD and PARTIAL LOAD) resulting in only one closure ever being

connected to the common. The POT allows for highly accurate and
repeatable threshold settings for both relay closures.

“Full Load”
Threshold

“Partial
Load”
Threshold

Clockwise (CW) rotation of the 15-turn POT increases threshold (i.e.,
reduces sensitivity) and changes partial load threshold, accordingly.

Clockwise rotation of the 15-turn POT increases threshold.

Threshold Adjustments

NOTE: Do not attempt threshold adjustments during periods of high or
low power line voltage or voltage fluctuation.

NOTE: If partial power output is not required, the partial power
adjustment may be placed in any position that does not cause LED
flashing or relay chatter.

Based on the POT adjustment convention described above, the following
steps adjust the CNCS to their proper threshold settings when being used
for low power loads, high power loads with partial power, or high power
loads. These steps assume that all hardware connections have been made
properly and power has been applied to all units and left in their “OFF”
modes.

Low Power Loads (Such as VCRs)

1. Rotate FULL LOAD POT 15 turns counterclockwise (CCW).

2. Rotate PARTIAL LOAD POT 15 turns CCW.

3. Place VCR (or other low power load unit) in “ON” mode. Red and
yellow LEDs should illuminate.

4. Slowly rotate FULL LOAD POT CW until red LED flashes and
relay chatters.

Operations Guide – DOC. 8079D AC Current Sensor: CNCS • 9

AC Current Sensor Crestron CNCS

5. Place VCR in “OFF” mode. Red LED should turn off.

6. Slowly rotate FULL LOAD POT CCW while counting the turns
until red LED flashes and relay chatters.

NOTE: If the LED flash and relay chatter cannot be achieved in step 6,
restart procedure from step 1. After performing step 4, rotate FULL
LOAD POT two turns CCW. Continue onto step 5, omit steps 6 and 7,
and complete steps 8 and 9.

7. Rotate FULL LOAD POT CW half the number of turns counted
in the previous step. For example, if the POT was rotated four turn
CCW in step 6, the POT should then be turned CW two turns in
this step.

8. Rotate PARTIAL LOAD POT CW until yellow LED flashes and
relay chatters.

9. Rotate PARTIAL LOAD POT two to five turns CCW.

High Power Loads with Partial Power (Such as TV Sets)

1. Rotate FULL LOAD POT 15 turns CW.

2. Rotate PARTIAL LOAD POT 15 turns CCW.

3. Slowly rotate FULL LOAD POT CCW until yellow LED flashes
and relay chatters.

4. Slowly rotate PARTIAL LOAD POT CW until yellow LED turns
off.

5. Slowly rotate PARTIAL LOAD POT CW an additional two turns.

6. Slowly rotate FULL LOAD POT CCW until yellow LED flashes
and relay chatters.

7. Slowly rotate PARTIAL LOAD POT CCW for an additional two
turns. Yellow LED should remain illuminated.

High Power Loads (Such as TV Sets)

1. Rotate FULL LOAD POT 15 turns CW.

2. Rotate PARTIAL LOAD POT 15 turns CCW.

3. Place TV in “ON” mode. Red and yellow LED should turn off.

4. Slowly rotate FULL LOAD POT CCW until red LED flashes and
relay chatters.

10 • AC Current Sensor: CNCS Operations Guide – DOC. 8079D

Crestron CNCS AC Current Sensor

5. Slowly rotate FULL LOAD POT CCW for an additional two to
five turns.

CNCS Implementation

The following diagram is an example of the CNCS implementation using
SIMPL

™

Windows®. This sample program illustrates discrete ON/OFF

for toggle type IR control and may not be relevant for every application.

CNCS – Example SIMPL Program

Operations Guide – DOC. 8079D AC Current Sensor: CNCS • 11

AC Current Sensor Crestron CNCS

Contact Information and Updates

Further Inquiries

If you cannot locate specific information or have questions after
reviewing this guide, please take advantage of Crestron's award winning
customer service team by calling the Crestron corporate headquarters at
1-888-CRESTRON [1-888-273-7876]. For assistance in your local time
zone, refer to the Crestron website (http://www.crestron.com/offices
a listing of Crestron worldwide offices.

You can also log onto the online help section of the Crestron website
(http://www.crestron.com/onlinehelp
products. First-time users will need to establish a user account to fully
benefit from all available features.

) to ask questions about Crestron

) for

Future Updates

As Crestron improves functions, adds new features and extends the
capabilities of the CNCS, additional information may be made available
as manual updates. These updates are solely electronic and serve as
intermediary supplements prior to the release of a complete technical
documentation revision.

Check the Crestron website periodically for manual update availability
and its relevance. Updates are identified as an “Addendum” in the
Download column.

12 • AC Current Sensor: CNCS Operations Guide – DOC. 8079D

Crestron CNCS AC Current Sensor

Return and Warranty Policies

Merchandise Returns / Repair Service

1. No merchandise may be returned for credit, exchange or service without prior authorization
from CRESTRON. To obtain warranty service for CRESTRON products, contact an
authorized CRESTRON dealer. Only authorized CRESTRON dealers may contact the factory
and request an RMA (Return Merchandise Authorization) number. Enclose a note specifying
the nature of the problem, name and phone number of contact person, RMA number and
return address.

2. Products may be returned for credit, exchange or service with a CRESTRON Return
Merchandise Authorization (RMA) number. Authorized returns must be shipped freight
prepaid to CRESTRON, 6 Volvo Drive, Rockleigh, N.J. or its authorized subsidiaries, with
RMA number clearly marked on the outside of all cartons. Shipments arriving freight collect
or without an RMA number shall be subject to refusal. CRESTRON reserves the right in its
sole and absolute discretion to charge a 15% restocking fee plus shipping costs on any
products returned with an RMA.

3. Return freight charges following repair of items under warranty shall be paid by CRESTRON,
shipping by standard ground carrier. In the event repairs are found to be non-warranty, return
freight costs shall be paid by the purchaser.

CRESTRON Limited Warranty

CRESTRON ELECTRONICS, Inc. warrants its products to be free from manufacturing defects in materials
and workmanship under normal use for a period of three (3) years from the date of purchase from
CRESTRON, with the following exceptions: disk drives and any other moving or rotating mechanical
parts, pan/tilt heads and power supplies are covered for a period of one (1) year; touchscreen display and
overlay components are covered for 90 days; batteries and incandescent lamps are not covered.

This warranty extends to products purchased directly from CRESTRON or an authorized CRESTRON
dealer. Purchasers should inquire of the dealer regarding the nature and extent of the dealer's warranty, if
any.

CRESTRON shall not be liable to honor the terms of this warranty if the product has been used in any
application other than that for which it was intended or if it has been subjected to misuse, accidental
damage, modification or improper installation procedures. Furthermore, this warranty does not cover any
product that has had the serial number altered, defaced or removed.

This warranty shall be the sole and exclusive remedy to the original purchaser. In no event shall
CRESTRON be liable for incidental or consequential damages of any kind (property or economic damages
inclusive) arising from the sale or use of this equipment. CRESTRON is not liable for any claim made by a
third party or made by the purchaser for a third party.

CRESTRON shall, at its option, repair or replace any product found defective, without charge for parts or
labor. Repaired or replaced equipment and parts supplied under this warranty shall be covered only by the
unexpired portion of the warranty.

Except as expressly set forth in this warranty, CRESTRON makes no other warranties, expressed or
implied, nor authorizes any other party to offer any warranty, including any implied warranties of
merchantability or fitness for a particular purpose. Any implied warranties that may be imposed by law are
limited to the terms of this limited warranty. This warranty statement supersedes all previous warranties.

Trademark Information

All brand names, product names and trademarks are the sole property of their respective owners. Windows is a registered trademark
of Microsoft Corporation. Windows95/98/Me/XP/Vista and WindowsNT/2000 are trademarks of Microsoft Corporation.

Operations Guide – DOC. 8079D AC Current Sensor: CNCS • 13

AC Current Sensor Crestron CNCS

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Crestron CNCS AC Current Sensor

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Operations Guide – DOC. 8079D AC Current Sensor: CNCS • 15

Crestron Electronics, Inc. Operations Guide – DOC. 8079D

15 Volvo Drive Rockleigh, NJ 07647 (2002144)
Tel: 888.CRESTRON 05.07
Fax: [phone] Specifications subject to
www.crestron.com change without notice.