Crestron ST-CS, Operation Manual, Page: 5 / 24

Crestron ST-CS Current Sensor Module
Current Sensor Module: ST-CS
Introduction
Features and Functions
There are two Crestron
®
Current Sensor Module configurations available: ST-CS
and STI-CS. Configuration is based on the type of power availability. Use the ST-CS
with a 120V power supply for 120 VAC devices, and the STI-CS with a 220V
power supply for 220 VAC devices. For purposes of this Operations Guide, the term
ST-CS is used for either configuration, except where noted.
The ST-CS 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 ST-CS ideally suited for use with low power units as
VCRs, TV tuners, and satellite receivers. The wide range makes the ST-CS ideally
suited for medium and high-powered units such as TV sets, video projectors, and
power amplifiers up to 10 A total load (6 A for STI-CS).
When the ST-CS electronic circuit senses that the average current drawn by a
monitored unit exceeds the FULL LOAD preset threshold, the full load LED
(labeled FULL) illuminates. The ST-CS sends a signal to the control system
indicating the current ST-CS status.
Secondary circuitry senses and determines whether the average current is less than
the FULL LOAD preset, but more than no load. This PARTIAL LOAD threshold is
also adjustable. The FULL LOAD and PARTIAL LOAD circuitry is mutually
exclusive; only one definite status is communicated to the control system. The FULL
and PARTIAL LEDs are illuminated one at a time.
Threshold adjustments are accomplished by use of a 15-turn precision potentiometer
(POT). The POT permits highly accurate and repeatable current threshold settings.
Functional Summary
•
Ideally suited for use with large TVs (minimum load specification
0.033A, 4W).
•
The wide range makes the ST-CS ideally suited for medium and high-
powered units such as TV sets, video projectors, and power amplifiers.
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Rack mountable with optional ST-RMK (1 space height).
Operations Guide – DOC. 5677A Current Sensor Module: ST-CS
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