Crestron CNCS User Manual
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Brand: Crestron
Category: Cooktop
Type: Operation & user’s manual for Crestron CNCS
Pages: 6 (0.04 Mb)
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CRESTRON CNCS AC Current Sensor
REMOTE CONTROL SYSTEMS
1 DOC. 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
Maximum AC Load 8.5 A, 1 KW at 120 VAC
Minimum AC Load 0.033 A, 4 W at 120 VAC
Voltage Range 0 to 220 VAC, 45 to 65 Hz
Relay Contact Rating 1 A, 24 V (AC or DC)