Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 0

Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 1

Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 2

Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 3

Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 4

Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 5

Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 6

Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 7

Eurotherm AmpStack AS-1 Heater Power Controller 30A 120-240VAC 4-20mA, 105C, US $39.50 – Picture 8

Eurotherm Ampstack As-1 Heater Power Controller 30a 120-240vac 4-20ma, 105c

US $39.50

Union City, California, United States
Jun 9th

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Eurotherm AmpStack AS-1 Heater Power Controller, Model AS1-30A240V/4-20mA, 105C Eurotherm AmpStack As-1 Heater Power Controller, removed in Operational Condition, untested since purchase. This Heater Power Controller is rated for 105 Degrees C. These are from a Diffusion Furnace used in a Semiconductor Fab Clean Room Environment, then stored in a clean, dry warehouse. They have not been exposed to any harsh environments or elements. Specifications and Details: 30 Amp 120/ 240 VAC output switched by 4-20 mA input. Input can be converted to logic voltage, logic current, or 120VAC. From the Eurotherm manual: "The AmpStack or AS1 is a line of single phase solid state contactors designed for zero crossing firing. The AmpStacks utilize control signals which include a logic voltage signal (5-30VDC), a logic current signal (2-30mA), a logic AC voltage signal (85-135VAC) or a 4-20mA continuous signal. Designed for the highest reliability, each AmpStack features transient voltage and fast acting (I2t) fuse protection. Each unit is designed with an isolated heatsink and to operate at ambient temperatures up to 60 C or 140 F at full rated current and voltage. To assist in troubleshooting, a standard feature of the AmpStack is a fuse failure indication and LED indication of the presence of an input signal. Optionally, a partial load failure circuit complete with relay output is available for annunciating a load failure. The power being switched by the AmpStack and the ground connection are made via terminal lugs located at the top of each unit while the control input and output connections are made via a terminal strip located at the bottom of each unit. A label affixed to the heat sink directly below the bottom terminal strip contains the rating, model number and serial number of each unit." This is a basic high quality, high power solid state relay built by Eurotherm used mainly to control heaters with a fast firing cycle in a PID loop, but it will work just as well with any resistive load such as lighting, etc. Inside the unit: A module containing a pair of power SCRs is mounted on a large heatsink and includes a well designed snubber circuit to minimize spurious electrical emmisions and turn-on/ turn-off spikes. This is useful because there are no contacts to burn or line noise caused by switching transients such as with a simple contactor. It is designed for rapid on-off cycles for precise heater control. There is a FRN-R or TR-R style time-delay fuse (9/16 x 2 inches) in each one in series with the outputs. The output circuit is separated from the input circuitry by a 4N35 optocoupler surrounded by plenty of blank board space. The input is powered solely by the 4-20 mA input and has an LED that lights when enough power is present to trigger the output. Input switching from the optoisolator to the output stages is via an LM358N dual op amp. There are several other input terminals but they do not connect to anything on the board. They were provided for the extra options that are not included. It works just as well on 120VAC as it does on 240VAC, with the same voltage drop of 1.3V or less across the output SCRs. The greater the load, the smaller the voltage drop. At full power of 30A, the voltage drop would equal about 30W or less, just enough to justify the large heat sink. 4-20mA operation is the most robust of any communication standard and allows for the rapid cycling of the outputs. If you are unfamiliar with 4-20 mA control lines, here are a few short tutorials that will show you how simple they are to work with: Understanding-4-20-mA-Current_Loops.pdf dms-an20.pdf an104.pdf It can be converted to any type of input protocol you need. The manual shows the circuitry for 4-20mA, 120VAC, DC logic voltage, and DC logic current inputs. The basic layout is shown and the resistor values can be calculated fairly easily. For simple operation, a 690 ohm resistor in series with a 24VDC supply will suffice to switch the unit on and off in 4-20mA mode. In other terms, a voltage of about 5.8 to 6 VDC at the terminals will turn them fully on, and a voltage of 5 volts or less will turn them fully off. Between 5 and 5.8 volts, the unit will flash on-and-off at a rate that increases until the full-on voltage of 5.8 volts is reached. There is a heat sink, measuring 9x3.5x3 inches with a card slot along the top edge, that can be re-purposed for other projects if you do not need a power controller. The case rises another 1-5/8 inch above the heat sink for a total height (actually depth, since it is meant to be mounted vertically on a back plane) of 4-5/8 inches. Check Out: *Purchase: Making purchases is easy and simple. To place an order for procurement, please click the “Buy It Now” button. Follow to the next page for payment instructions. *Payment: Click the “Pay Now” button at the top of the E-Bay page to proceed with the checkout and payment process. Payment must be made within 5 days of purchase. *Accepted Forms: We accept PayPal, or you may pay on your credit card via PayPal. When paying via PayPal, payments must include your shipping address and should be submitted via the E-bay payment process. Sales Tax: *For California customers, sales tax is added and depends upon your location. If you are tax exempt, please provide a copy of your Tax Exempt Certificate prior to check out. Please do not send payment before receiving a revised invoice. Shipping: *Shipping rates are the responsibility of the customer and are not refundable. Rates include handling, packaging materials, label scanning and tracking information. Shipping rates are based upon the weight and dimensions of the package and your location. If we have packaging materials for smaller items, we include packaging and handling at no charge. If they are unavailable, we charge our cost. For larger capital equipment, please contact us for crating costs and exact weight prior to shipment as the crate will add weight to the tool set. *Insurance: Should you prefer insurance on your item, please inform us PRIOR to check out so this may be added to the shipping cost. Insurance is not added unless specifically requested by the buyer. *Processing Time: Once payment has cleared, we make every effort to ship your item within 1-2 business days. Larger capital equipment which requires crating may require a longer time to build the crate. *Freight Shipment: Freight Shipment is the responsibility of the buyer, although we will do everything possible to assist you with this process. There may be rigging, crating or palletizing charges depending upon the item purchased. Please contact us for additional information on the item you purchase. *Local Pick Up: Local pick up is available on most items. Please contact us to arrange pick up for your items. *Shipping Account: If you would prefer to use your shipping account, please let us contact us. We are happy to do so. *International Shipping: International shipping is determined on a case by case basis. We reserve the right to refuse shipment to certain locations/customers if all our requirements are not met. All documentation and customs reports are to be prepared by the purchasing party and provided prior to pick up. 48 Hour notice is a minimum required notice prior to International pick up. Insurance is required on all International orders. Customer Service: *Inquiries: Please contact us with any questions you have on any listed item. While we are closed over the weekend, we will make every effort to answer your questions as soon as possible. Most questions are answered in less than 24 hours. Warranty: *Products are sold As Is, Where Is: All items are sold As Is, Where Is, without warranty expressed or implied unless specifically stated in the posting. This does not mean that the unit does not work, only that we have not tested it or check it out. This also may mean that we are not knowledgeable in a certain item. *All Sales are Final: All sales are final. Please ask any pertinent questions regarding the condition before you purchase your item. We reserve the right to refuse a return based upon not understanding the description or not wanting the item. *DOA Terms: An item said to be in working condition but received Dead on Arrival (DOA) can be returned for exchange or refund (when no exchange is available) within if we are notified within 7 days of receipt of product. Compensation will be provided upon return of item, physical examination, testing and serial number verification. If any one of these items are not met, we reserve the right to withhold funds for an indefinite time until all requirements are met. *Return Shipment: All items must be in the same condition as when they left our facility. For claims, it is required that original packaging materials be retained and returned with the defective product. If the item has been changed or tampered with in any way, from original condition, we reserve the right to refuse refund. Upon receipt of the unit we will fully test the item in question, visually inspect the condition and verify the serial numbers. If the state of the item is not as was described in the listing, we reserve the right to refuse refund. If it is evident the item was damaged due to improper installation or use, we reserve the right to refuse refund. All returned shipments should be properly insured. We will not honor claims for any items which were uninsured and damaged during return shipment. *Shipping, Handling and packaging are not refunded on return items. UPS, USPS, FEDX etc. charge us these fees and do not return them so we cannot refund them to our customers. *Auction Pictures: Some auction pictures may be representational only and not the exact items we will ship (particularly if we have a quantity of more than one listed).

“Excellent Condition”

Brand	Eurotherm
MPN	AS1-30A240V/4-20mA
Model	Amp Stack AS1
Country/Region of Manufacture	United States