Crestron CNCS Manuale utente
CRESTRON CNCS AC Current Sensor
REMOTE CONTROL SYSTEMS
1DOC. 8079C
Specifications subject to change without notice.
CRESTRON ELECTRONICS, INC.
FULL
PARTIAL
COMMON
F
P
C
1000 W MAX
AC INPUT
OUT
C
P
F
GND
24+
CNCS
PWR
CW =INCREASED THRESHOLD
PARTIAL
LOAD
FULL
LOAD
AC OUTPUT
MAX
1000 W
FRONT PANEL BACK PANEL
Figure 1. CNCS, AC Current Sensor
DESCRIPTION:
The CNCS, illustrated in figure 1, measures the average current of each half cycle of an AC load.
The current sensing circuitry is highly sensitive with a wide range of adjustment. The high
sensitivity makes the CNCS ideally suited for use with low power units such as VCRs, TV tuners,
and satellite receivers. The wide range makes the CNCS ideally suited for medium and high
powered units such as TV sets, video projectors, and power amplifiers.
The CNCS provides an isolated relay closure when the average current drawn by a monitored unit
exceeds the FULL LOAD preset threshold.
A second set of relay contacts determine whether the average current is less than FULL LOAD,
but more than no load. This PARTIAL LOAD threshold is also adjustable. The FULL LOAD and
PARTIAL LOAD relay closures are mutually exclusive so that only one closure is ever connected to
the common. However, FULL LOAD and PARTIAL LOAD indicators are implemented, so that at
FULL LOAD, both LEDs are illuminated.
Threshold adjustments are accomplished by use of a 15-turn precision potentiometer (POT). The
POT permits highly accurate and repeatable current threshold settings.
LEADING SPECIFICATIONS:
Table 1 provides a summary of leading specifications for the CNCS. Dimensions and weight are
approximations rounded to the nearest tenth unit.
Table 1. Leading Specifications
SPECIFICATION DETAILS
Power Requirements 24 VDC, Load Factor of 3 W
MaximumACLoad 8.5 A, 1 KW at 120 VAC
MinimumACLoad 0.033 A, 4 W at 120 VAC
VoltageRange 0 to 220 VAC, 45 to 65 Hz
Relay Contact Rating 1 A, 24 V (AC or DC)
CRESTRON CNCS AC Current Sensor
REMOTE CONTROL SYSTEMS
2DOC. 8079C
Specifications subject to change without notice.
Table 1. Leading Specifications (continued)
SPECIFICATION DETAILS
Dimensions&Weight Height: 1.8 in (4.6 cm)
Width: 4.2 in (10.7 cm)
Depth: 4.3 in (10.9 cm)
Weight: 1.8 lb (0.8 kg)
Construction 18 gauge cold-rolled steel,
blackpainted finish
LED INDICATORS:
PWR (Power)
The green LED illuminates when 24 volts DC is supplied to the CNCS.
FULL LOAD
Thered LED illuminates whenFULLLOADthresholdhas been exceeded.
PARTIAL LOAD
The yellow LED illuminates when PARTIAL LOAD threshold has been exceeded.
USER ADJUSTMENTS:
FULL LOAD Threshold
Clockwise (CW) rotation of the 15-turn POT increases threshold (i.e., reduces sensitivity) and changes
partial load threshold, accordingly.
PARTIAL LOAD Threshold
Clockwise rotation of the 15-turn POT increases threshold (i.e., reduces sensitivity).
THRESHOLD ADJUSTMENTS:
Refer to figure 2 for a block diagram illustrating hookup connections for the CNCS.
NOTES
1. Do not attempt adjustments during periods of high or low power line voltage or
voltage fluctuations.
2. Partial power output may be used as the primary output if increased sensitivity is
required.
3. If the partial power output is not required, the partial power adjustment may be
placed in any position which does not cause LED flashing or relay chatter.
CRESTRON CNCS AC Current Sensor
REMOTE CONTROL SYSTEMS
3DOC. 8079C
Specifications subject to change without notice.
Figure 2. CNCS, Hookup Block Diagram
EQUIPMENT
TO BE SENSED
CNCS
AC INPUT
AC OUTPUT
OUT
P
C
GND
24+
F
CNTBLOCK
(OR
OTHER
TERMINAL
BLOCK)
CNMS
OR
CNRACK(-D)
24+
G
G
2
1
CNDIO
OR
CNIN-16
CRESNET II
NETWORK
OR
EXTERNAL
POWER
SUPPLY
24
G
G
24
TWISTED PAIR
OPTIONAL
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 VCRin"ON"mode. Red and yellowLEDsshouldilluminate.
4. Slowly rotate FULL LOAD POT CW until red LED flashes and relay chatters.
5. Place VCR in "OFF" (i.e., standby) mode. Red LED should extinguish.
6. Slowly rotate FULL LOAD POT CCW and count turns until red LED flashes and relay chatters.
CRESTRON CNCS AC Current Sensor
REMOTE CONTROL SYSTEMS
4DOC. 8079C
Specifications subject to change without notice.
NOTE If the LED flash and relay chatter can not be achieved in step 6, start procedure again
with step 1. After performing step 4, rotate FULL LOAD POT two turns CCW.
Continue procedure with step 5, omitting steps 6 and 7.
7. Rotate FULLLOADPOTCW half the numberofturnsrequired in the previousstep. For example,if the
POT was rotated four CCW turns in step 6, the POT should then be rotated CW two turns for 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 with Partial Power (Loads such as TV Sets)
1. Rotate FULL LOAD POT 15 turns CW.
2. Rotate PARTIAL LOAD POT 15 turns CCW.
3. PlaceTVin standby mode.
4. Slowly rotate FULL LOAD POT CCW until yellow LED flashes and relay chatters.
5. Slowly rotate PARTIAL LOAD POT CW until yellow LED extinguishes.
6. Slowly rotate PARTIAL LOAD POT CW for an additional two turns.
7. Slowly rotate FULL LOAD POT CCW until yellow LED flashes and relay chatters.
8. 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. Redandyellow LEDs should beextinguished.
4. Slowly rotate FULL LOAD POT CCW until red LED flashes and relay chatters.
5. Slowly rotate FULL LOAD POT CCW for an additional two to four turns.
CRESTRON CNCS AC Current Sensor
REMOTE CONTROL SYSTEMS
5DOC. 8079C
Specifications subject to change without notice.
PROGRAMMING:
A basic CNCS SIMPL program is illustrated in figure 4. The sample program illustrates discrete ON/OFF
fortoggle type IR control.
NOTE The program example is provided as a sample of CNCS implementation and may not
be relevant for every application.
An example follows the figure to illustrate the CRESNET II screen display for CNCS signal assignment.
The"screen saves" inthe example are accessible from the "DefineRack" section ofthe SIMPL-I Menu in
the CRESNET II Workshop and are shown for the CNDIO (which is built-in to the CRESNET II
MiniSystem) and CNIN-16 (which can be inserted into the CRESNET II MiniSystem or RACK).
NAND
ON
FULL-LOAD
ON
EN-OFF
POWER-OFF
BUTTON
FEEDBACK
CNDIO
INPUT
(FOR CNMS)
OR
CNIN-16
(FOR CNRACK)
CNCS PARTIAL-LOAD
FULL-LOAD
AND
OFF OFF
BUTTON
AND POWER-ON
OR
POW MV POWER
0.5 S
TRIG OUT IR
Figure 4. CNCS, SIMPL Program
FURTHER INQUIRIES:
If after reviewing this Operations Guide you still have additional questions, please contact a CRESTRON
technical representative by dialing (888) CRESTRON [(888) 273-7876] or (201) 894-0660.
CRESTRON CNCS AC Current Sensor
REMOTE CONTROL SYSTEMS
6DOC. 8079C
Specifications subject to change without notice.
Program Example:
CNDIO Signal Assignment
ESC to go back Module Detail F1=Help
CNDIO
Digital input/output module
Slot: 02Rack: 00
SIGNAL NAMES
INPUTS OUTPUTS
1 :
2 :
3 :
4 :
5 :
6 :
7 :
1 :
2 :
3 :
4 :
5 :
6 :
7 :
F2-Detail F3-Display Signals F4- Auto-Increment
CRESNET II Workshop v5.0
8 : 8 :
FULL-LOAD
PARTIAL-LOAD
CNIN-16 Signal Assignment
ESC to go back Module Detail F1=Help
CNIN-16
input module - 16 closures to common
Slot: 05Rack: 00
INPUT SIGNAL NAMES
AB
1 :
2 :
3 :
4 :
5 :
6 :
7 :
1 :
2 :
3 :
4 :
5 :
6 :
7 :
F2-Detail F3-Display Signals F4- Auto-Increment
CRESNET II Workshop v5.0
8 : 8 :
FULL-LOAD
PARTIAL-LOAD
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