Turbines PT420 Manual

Frequency converter

Hide thumbs

Table Of Contents

Table of Contents

Quick Links

Download this manual

Model PT420

Frequency Converter

PO Box 933, 15935 US Hwy 303 N.

Altus, OK 73522-0933

1-800-809-1387

Seneca: 864-882-4544

http://turbinesincorporated.com

Information contained herein is subject to change at any time without prior notice.

Table of Contents

Need help?

Do you have a question about the PT420 and is the answer not in the manual?

Questions and answers

Summary of Contents for Turbines PT420

Page 1 Model PT420 Frequency Converter PO Box 933, 15935 US Hwy 303 N. Altus, OK 73522-0933 1-800-809-1387 Seneca: 864-882-4544 http://turbinesincorporated.com Copyright 2013-2017 Turbines Inc. All rights reserved. Information contained herein is subject to change at any time without prior notice.
Page 2 Le fabricant décline toute responsabilité pour les dommages causés par une utilisation incorrecte de l'instrument ou de modifications ou de changements apportés à l'instrument.  La sécurité de tout système intégrant l'équipement est de la responsabilité de l'assembleur du système. Technical Improvements Turbines Incorporated may modify the technical data herein without notice.
Page 3: Table Of Contents
Operation Overview ............................ 13 Flow Calculations ............................ 13 Linearization............................14 Units of Measure ............................. 14 4-20mA Current Loop ..........................14 Voltage Output ............................16 Pulse Output ............................18 Reset ............................... 21 Power ..............................21 PT420 Configuration and Operation ....................... 22...
Page 4: Description
LED indicators. The two selectable PT420 inputs accept sine and square wave signals generated by passive and, respectively, active magnetic pickup coil probes. Computations include calculation of liquid flowrate in Pulses per Second based on the turbine pulse rate and in Gallons per Minute based on the predetermined turbine k-factor.
Page 5: Specifications
Turbines Incorporated PT420 User Manual PT420 User manual.docx Specifications  Programming and Monitoring Options via PC Displayed Hyperlink Terminal Window  Flowrate Monitoring  6 digit when expressed in Pulses per Second  Decimal locations: 0.01 to 9999.99  6 digit when expressed in Gallons per Minute ...
Page 6 Turbines Incorporated PT420 User Manual PT420 User manual.docx  Engineering Unit Conversions  Pre-programmed units: Gallons  Compensation  Linearizer table 2 to 20 points  Time Base  Rates can be displayed per second or minute  Outputs  Factored Pulse (based on input pulses or calculated Gallons) ...
Page 7 Turbines Incorporated PT420 User Manual PT420 User manual.docx  Compliance  Pollution Degree: 2  Overvoltage Category: I  Altitude: 2000 m max  Environmental  Operating: -40 to 65°C (-40 to 150°F)  Storage: -40 to 85°C (-40 to 185°F) ...
Page 8: Dimensional
Turbines Incorporated PT420 User Manual PT420 User manual.docx Dimensional...
Page 9: Wiring
The only user serviceable parts of the PT420 are TB1, TB2 and J1 connectors. When servicing or programming the PT420, take care when opening the cover of the unit that any internal signal or power wires are not strained or pulled.
Page 10  POUT is the factored pulse output RS232_CTS +5V_RS232 RS232_TXD RS232_RXD RS232_RTS Where:  RS232_CTS and RS232_RTS are RS232 control signals  RS232_TXD and RS232_RXD are RS232 data signals  + 5V_RS232 is the 5Vcc voltage input from RS232/USB cable Figure 1. PT420 Connection Diagram...
Page 11: Wiring Examples
Turbine sensor The turbine sensor provides the PT420 with a sinusoidal signal generated by a passive magnetic pickup coil or square pulses generated by an active magnetic pickup coil supplied from an external DC power supply or PT420.
Page 12 Fig 3. Active magnetic pickup coil supplied by PT420. Flow monitor PT420 is able to provide a Flow monitor with three types of signals: 4-20mA, 0-5/10V and square pulses, all based on the flowrate of the liquid/gas passing through the pipe is attached to.
Page 13 Loop – Voltage In Vout Pulse In Pout Common Gnd/Shield This end of shield is not connected Fig 7. Flow monitor configured as a flow rater using PT420 0-5/10V output signal. PT420 placed at a long distance from the Flow monitor.
Page 14 This end of shield is not connected Fig 9. Flow monitor configured as a flow rater and totalizer using PT420 0-5/10V and, respectively, Pulse output signals. PC/laptop PT420 is provided with an RS232 data link, allowing its programming and flow monitoring through a hyperlink terminal window displayed on a PC/Laptop screen.
Page 15 PT420 (pins 1 and 2 of the TB2 connector). Caution: For an IS certified PT420 installed in a hazardous location, all field wiring must conform to wiring methods for explosion-proof installations as defined by the National Electric Code in United States or by the...
Page 16: Operation Overview
Turbines Incorporated PT420 User Manual PT420 User manual.docx Operation Overview This section details different aspects of the PT420 operation. Flow Calculations Calculation for uncompensated flow rate and the input frequency: Q = 60 * F / K F = Q * K / 60 where, –...
Page 17: Linearization
PT420 User manual.docx Linearization Linearization, as it pertains to the PT420, is the selection and interpolation of a K-Factor from a table of calibrated values based on frequency. Whenever a new frequency is detected, the unit will look up adjacent frequency values in the linearizer table and calculate a K-Factor (using linear interpolation). If the frequency value is below the lowest frequency in the table, then the linearizer uses the lowest point in the table.
Page 18 To assure normal operation of the 4-20mA Current Loop when using the RS232 data link, the RS232 to USB cable has to be attached to J1 connector after the correct voltage is supplied at the 4-20mA inputs of PT420 (pins 1 and 2 of the TB2 connector).
Page 19: Voltage Output
Fig 11. 4-20mA Output current versus flowrate Voltage Output Similar to 4-20mA feature PT420 provides an output voltage proportional with frequency/flowrate and whose minimum and maximum limits represent a set of preprogrammed minimum and maximum frequency/flowrate values. In this case, the minimum programmed frequency/flowrate will produce a 0V output voltage while the maximum programmed frequency/flowrate will produce a selectable 5V or 10V output voltage.
Page 20 Turbines Incorporated PT420 User Manual PT420 User manual.docx Case 1: Assuming the following: F = 2510 Hz Umax = 10 V Fmin = 10 Hz Fmax = 5010 Hz It results that for an input frequency of 2510 Hz, and given frequency limits, the output voltage will be, U = (10 / (5010 –...
Page 21: Pulse Output
The pulse divider programming includes sub unitary numbers, allowing volume measurement down to fractions of gallon. Also, in order to increase the PT420 adaptability to the variety of devices used in the field as pulse counters/totalizers, the pulses width can be programmed to a wide range of values.
Page 22 A second restriction is that the range of the pulses width for allowing PT420 to continuously stream pulses at its Pulse output is between 1mS and 500mS.
Page 23 It is therefore the duty of the PT420 user to correctly estimate/adjust these parameters for an accurate pulse counting (for example by reducing the Pulse Width, increasing the Pulse Divider, etc).
Page 24: Reset
In the above example this translates in an error of 10 Gallons. Reset The PT420 has two totalizers, the Batch total and the Grand total. The Batch total is resettable while the Grand total is not resettable. Their operation is controlled through the hyperlink terminal window displayed on a PT420 connected PC/Laptop device, as it will be explained in more detail later in the “PT420...
Page 25: Pt420 Configuration And Operation
4mA lower limit of the 4-20mA current loop range  When an external source, Vdc or 4-20mA loop, is used to supply PT420 and the Output voltage is enabled, the voltage of the external source has to be at least 2V higher than the selected upper limit, 5V or 10V, in order to assure the Output voltage accuracy at the top of its range.
Page 26 Turbines Incorporated PT420 User Manual PT420 User manual.docx I - Monitor and set flow inputs and calibrate ranges This Menu item has two components: one is responsible for setting the flowrate lower and upper limits and resetting the batch totals to zero and the other one allows the flow rate monitoring, in pulses per second, Hz, and gallons per minute, GPM, and units counting in pulses and gallons.
Page 27 PT420 User Manual PT420 User manual.docx Note: The linearizer table values are obtained from the calibration sheet of the turbine the PT420 is supposed to use in a given application. L - Manually set flow input limits This Menu item allows the setting of the minimum and maximum flowrate limits in pulses per second, Hz, or gallons per minute, GPM.
Page 28 PT420 User Manual PT420 User manual.docx S - Select input source This Menu item allows the selection of the source providing the PT420 input pulses, passive magnetic pickup coil or active magnetic pickup coil producing square wave pulses. By pressing the...
Page 29 Turbines Incorporated PT420 User Manual PT420 User manual.docx V - Configure voltage output This Menu item allows the configuration of the Voltage output. By pressing the key the following self-explanatory Submenu items shows up: Voltage output range is 0.0 to 10.0 volts.
Page 30 LED’s placed on the PT420 electronic board. This method offers additional operational flexibility by allowing the user to adjust the PT420 flowrate limits based on the changes in the operational conditions occurring in the field.
Page 31 Turbines Incorporated PT420 User Manual PT420 User manual.docx Fig 14. Flowchart illustrating the sequence of actions required to set the PT420 lower and upper flowrate limits when using its on board switches and LED’s.
Page 32 Press simultaneously S1 and S2 and release them for storing the flow rate lower and upper limits in the PT420 memory and observe both LED’s blinking at 8Hz for 2 second to confirm that the programming of the lower and upper flow rate limits was successfully finished; if, by mistake, the flow rate lower and upper limits captured in the previous steps don’t meet the...