The main design criteria for the EWS was to provide a comprehensive yet inexpensive monitor system that could warn of a pending problem before more serious damage is caused to equipment, facilities, or product. The system was to be easy and inexpensive to install, would be operator friendly and would be self-calibrating. The system would provide useful information to make the job of a system maintenance technician easier.
EWS-MP Monitor Panel, hardware Version 3, Firmware Version 3.1 EWS-CT three phase Current Transformer
EWS-CT1 single phase Current Transformer
EWS-TS integrated circuit Temperature Sensor
EWS-SW Switch sensor with target magnet
EWS-ML Minimum Load, 120mA at 120V 60hz.
EWS-RA Remote Alarm, 12Vdc, 12mA
EWS-PA Power Adaptor 120Vac to 12Vdc
EWS-DL Data Logger with 4 days memory
EWS-DV Data Viewer Version 1.1 EWS-IM Interface Module to provide a 0 - 5 Volt outputs from an EWS-CT
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- retail convenience stores that have refrigerated chests and cabinets,
- restaurant and food preparation facilities with freezers and refrigerated spaces, exhaust and makeup fans,
- commercial warehouse and processing facilities with coolers, chillers, and mechanical refrigeration, bulk material handling systems, conveyor systems,
- recreation facilities including ice rinks, swimming pools, and hot tubs,
- agricultural production and storage facilities including confined livestock ventilation, heating, and watering, fish farm water circulation and temperature controls, vegetable and fruit storage, grain and material handling conveyors, augers, legs, feed processing, grinding and mixing, grain and forage drying, water heating / cooling systems, potable water systems, and
- industrial installations including circulation pumps, oil field production pumps, driers and separators, compressor stations, and chemical production and processing facilities.
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- condenser is plugged with tree fluff or leaves, condenser fan fails to come ON or thermostatic two speed fan switch fails may cause excessive head pressure, higher compressor running current and longer run times.
- compressor seals begin to leak and lubricant is lost causing excessive running current and higher starting currents.
- slow leak of refrigeration fluid causes excessive ON times and lower operating current than normal.
- worn compressor may cause abnormal running current, higher starting currents, and longer run times.
- faulty defrost cycle, faulty evaporator fan(s), or a frozen evaporator can cause lower running current, excessive compressor cycling, or longer run times.
- plugged air filters can cause abnormal fan motor current.
- plugged in-line filters can reduce pump efficiency and affect system pressures and flow rates.
- faulty dampers can cause abnormal fan motor currents and run times.
- faulty heaters can cause abnormal process temperatures or equipment freeze-up.
- faulty fans or circulation pumps can cause abnormal process temperatures.
The primary function of the EWS is to measure and analyze the operating current of electrical loads like motors, compressors, fans, heaters and lighting circuits. A current sensor (called a Current Transformer) is installed to measure the current used by an electrical load.
The EWS-MP is able to provide a very wide range of current monitoring by using a non-linear burden on the current transformers. The voltage signal produced when the CT is connected to the MP provides sensing of load currents from 0.01 to 100 amps. The resolution of the current measurement is about 20 points per decade of current which is adequate for general purpose load monitoring.
Most mechanical systems in buildings and processes attempt to control or maintain a process temperature. A secondary function of the EWS is to monitor process temperature and provide a warning if the temperature fluctuates more than desired.
Any number of switch type sensors can be connected in series or parallel to provide a normally closed circuit.Back to Top Home
- The EWS is not to be used for life-critical or life-support applications.- The EWS is not intended to replace or over-ride control systems or limit devices that are required for safety purposes.
- Cascade does not provide the alarm monitoring system that may have an auto dialer and remote monitoring. Most facilities have a security alarm system that can be connected to the EWS-MP to provide that service.
- The EWS-CT Current Transformers are for measuring 50 or 60 hz Alternating Current only.
- If a load is running continuously, then the duty cycle monitoring is meaningless and this feature can be disabled using a programming switch setting.
- If a load is continuously variable or has stepped or staged loads that change over a wide range, (such as a variable speed motor drive or a two speed fan) then the average running current limits are meaningless and this feature can be disabled using a programming switch setting.
- If a load changes significantly with seasonal variations, then seasonal re-calibration may be required to minimize false alarms.
- If the load current is zero when the load is switched OFF, then the breaker trip monitoring is not functional. An optional accessory, the EWS-ML Minimum Load device can be used to provide a minimum pilot current for circuit breaker trip detection.
- The range of the standard temperature sensor is from -50C to +60C.
The EWS-CT Current Transformers are CSA / NRTL approved as a Class 1 to Class 2 interface device. The CT is mounted in a knockout of a junction box or electrical equipment panel with the Class 1 circuits inside and the Class 2 circuit outside.
The end-user pricing of the EWS components is given below in US$ and CDN$. Quantity discounts are available for distributors and installers. Contact Cascade Systems for information about distributing these products. Shipping costs via UPS ground are included for system purchases. Shipping costs for individual components or for other shipping methods will be to the purchasers account.
Item |
$US |
$CDN |
EWS-SK System Kit includes 1 EWS-MP, 1 EWS-CT, 1 EWS-TS, 1 EWS-PS |
$375.00 |
$560.00 |
EWS-MP Monitor Panel, hardware Version 4, Firmware Version 4.1 |
$330.00 |
$495.00 |
EWS-CT three phase Current Transformer |
$69.00 |
$103.00 |
EWS-CT1 single phase Current Transformer |
$56.00 |
$83.00 |
EWS-TS integrated circuit Temperature Sensor |
$14.50 |
$21.50 |
EWS-SW Switch sensor with target magnet (pack of 5) |
$20.75 |
$31.00 |
EWS-ML Minimum Load, 120mA at 120V 60hz. |
$7.50 |
$11.25 |
EWS-WP 100 ft sensor extension wire kit | $5.74 | $8.62 |
EWS-RA Remote Alarm, 12Vdc, 12mA |
$8.00 |
$11.50 |
EWS-PS Power Supply Adaptor 120Vac to 12Vdc |
$10.00 |
$14.00 |
EWS-DL Data Logger with 4 days memory | $300.00 | $450.00 |
EWS-DV Data Viewer Version 1.1 | $68.00 | $100.00 |
Firmware upgrades for EWS-MP and EWS-DV when available (call for current versions and upgrade pricing) | ||
EWS-IM Interface Module to provide a 0 - 5 Volt outputs from an EWS-CT that can be used as an input signal to a Programmable Logic Controller. The output voltage is a linear conversion of the rms value of the measured load current. There are ranges available for 10, 20, 50, and 100 amps full scale. | $300 | $400 |
Due to our policy of continuous product enhancement and to provide great value to our customers, specifications and prices are subject to change without notice.
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If you install a Cascade EWS and, after contacting Cascade Technical Support, the system is found to be not suitable for your application, then Cascade Technical Support will issue a Return Authorization Number and the components can be returned directly to Cascade for a full refund of your purchase price.
There is no warranty as to the fitness or function of the monitor system with respect to any particular application. In no circumstances will Cascade Systems be liable for any subsequent or consequential damages arising from the use or misuse of this product.