4-20mA REPEATER CARD USER M ANUAL v1.3
Contents
1. 005 Door Card Firmware Terminal Card Firmware A Modbus Expansion Card installed with a 4 20mA Repeater Card on the same PF2100 must have v4 1 or newer firmware in order for the system to operate correctly 1 2 Comparison to 4 20mA Input Card The 4 20mA Repeater Card is behaviorally identical to the Profire 4 20mA Input Card with the exception of the additional 4 20mA level output Therefore if an existing 4 20mA Input Card is replaced with a 4 20mA Repeater Card there will be no change to system behaviour as long as both expansion cards have the same firmware installed Because of the similarity between the 4 20mA expansion cards this document does not cover the basic behaviour of a PF2100 in response to the 4 20mA inputs of the Repeater Card The hardware specifications requirements for the inputs outputs available on the 4 20mA Input Card are also not covered in this document For this information please refer to the 4 20mA Input Card Instruction Manual available at www profireenergy com This document covers the 4 20mA level output as well as the level offset feature available to newer PF2100 systems PROFIRE rr ENERGY INC v1 3 Apr 11 2014 Page 1 2 Level Output 2 1 Output Type For its level output the 4 20mA Repeater Card acts as a self powered 4 20mA transmitter The transmitter is powered by the PF2100 so the 4 20mA receiver does not need to provide power to the 4 20mA Repeater Card in or2. 4 20mA REPEATER CARD USER MANUAL Y 3 EXPANSION CARD O Table of Contents 1 OVENVIEW 2eivi adus tamen kampa ki vad teie EEN eri Eo d ENEE ERSEEENE dE ENEE EREECHEN dE E SA i m a 1 1 e ue ON e EE EE 1 2 Comparison to 4 20mA Input Card 2 71 ge EE 2 1 QUIEPDUE KEE 2 2 QUtpuUt Ee ee e EE 2 3 Output WIN Bruce alla dc caches Cand teat tate la Aaa ld AA A RL A A A A 3 Level Offset COMPENSATION E 3 1 O a a A E 3 2 kastallation Consideratl OMS cancion 3 2 1 Level Transmitters With Built In Compensation an annnenneennnananaennennnennnanannnaa 3 2 2 Effect on Level Output e ssstssdudvts idee kka du dd sa k te aiii 3 2 3 PF2100 System REQUIFE MENTS i testi rs 3 3 S ftware Configuratio M eege Seegen deeg TT PROFIRE 2014 Profire Energy Inc v1 3 Apr 11 2014 ENERGY INC 1 Overview The Profire 4 20mA Repeater Card provides PF2100 systems with two 4 20mA inputs for use with level and pressure transmitters as well as a 4 20mA output which mirrors the input 4 20mA level signal This allows a 4 20mA level transmitter to communicate with a PF2100 as well as another device with 4 20mA inputs such as a PLC without the use of additional hardware 1 1 System Requirements The 4 20mA Repeater Card is supported by PF2100 systems that meet the following minimum requirements Minimum version Minimum version for Level Offset Door Card Hardware Terminal Card Hardware E1 8 202 E1 8 200 E1 8 005 E1 8
3. ND col GND pm Level In Level In 12 24V Active 4 20mA l O 12 24V lt Transmitter Pressure In l O Pressure In 12 24V l O ej 12 24V Level Out Level Out pw EE a GND 0 O Z GND p q E E _ IN V AIN GND V AIN GND Analog Input Analog Input PRO FIRE 2014 Profire Energy Inc v1 3 Apr 11 2014 ENERGY INC Page 3 3 Level Offset Compensation 3 1 Background In certain level measurement applications it is not possible to place a level sensor at the bottom of a vessel due to the possibility of accumulation of sand or other solids When the level sensor is not at the bottom of the vessel the level measurement does not actually represent the level of the vessel since there is an offset between the bottom of the vessel and the bottom of the sensor Profire PF2100 systems with Door Card firmware versions later than E1 8 202 and Terminal Card firmware versions later than E1 8 200 provide optional compensation for this offset If a user enters the volume between the lowest point of the sensor and the bottom of the vessel the PF2100 will adjust its display control to compensate for the difference The figure to the right illustrates this idea The level transmitter will read Om and output 4mA because the fluid level is below the sensor With no level compensation a PF2100 will display the level transmitter s 4mA signal as Om with a range of 0 70m for the vessel With
4. der to receive a signal This also means that the maximum voltage available to the output to drive the 4 20mA signal is the same as the PF2100 system voltage 12V or 24V 2 2 Output Specifications Because the 4 20mA Repeater Card has an active 4 20mA output there are no power supply requirements for the 4 20mA receiver it is connected to so all 4 20mA inputs should be compatible with the level output The level output s electrical specifications are shown in the table below Maximum Loop Voltage Profire system voltage 12V or 24V Output Impedance 1250 to 500 Q PROFIRE 2014 Profire Energy Inc v1 3 Apr 11 2014 ENERGY INC Page 2 2 3 Output Wiring The following diagrams show two possible wiring configurations for the 4 20mA level output The difference between the two configurations only depends on the type of 4 20mA level transmitter used Refer to the 4 20mA Input Card Instruction Manual for details regarding the level transmitter input on the Repeater Card The PLC wiring shown is appropriate because the 4 20mA Repeater Card acts as a self powered transmitter If the Repeater Card level output is wired as a loop powered transmitter it will not work Using Passive 4 20mA Level Transmitter Using Active 4 20mA Level Transmitter Cy HI LVL NC CH HI LVL NC pm CO HI LVL COM HI LVL COM pm pm Cc HI LVL NO Cc HI LVL NO Passive 4 20mA A po Transmitter col G
5. level compensation the PF2100 can interpret 4mA as 30m with the proper range of 0 100m for the vessel Note that 0 30m measurements cannot be encoded by the 4 20mA signal since they are not actually measured by the level sensor 70m Level Transmitter PROFIRE rr ENERGY INC v1 3 Apr 11 2014 Page 4 3 2 Installation Considerations 3 2 1 LEVEL TRANSMITTERS WITH BUILT IN COMPENSATION Certain transmitters e g Rosemount 2088 allow for level offset compensation independent of the PF2100 This is accomplished by changing the span of the transmitter s 4 20mA signal As an example if a vessel has a level sensor that only measures its top half and an operator enters the offset the transmitter will encode the full range of the level sensor as a 12 20mA signal This allows for a PF2100 without level offset compensation to properly display the level in the vessel Care must be taken to ensure that the PF2100 Level Low and Level High Setpoints are not set to be within the range that the transmitter cannot encode Many transmitters do not support this type of offset compensation so the compensation provided by the PF2100 can be used in these cases The PF2100 level offset compensation allows the transmitter to use the entire 4 20mA span which improves the resolution of the level measurement 3 2 2 EFFECT ON LEVEL OUTPUT It is important to note that the 4 20mA Repeater Card will never adjus
6. t its 4 20mA level output signal due to level offset compensation The 4 20mA level output signal will always directly mirror the 4 20mA level input signal i e mA input MA output 3 2 3 PF2100 SYSTEM REQUIREMENTS As mentioned the level offset feature is only available on Profire PF2100 systems with the following firmware versions Door Card Firmware E1 8 202 or later IO AR NE E1 8 200 or later 3 3 Software Configuration Level offset compensation can be enabled on the PF2100 using the following procedure Navigate to the 6 Expansion Cards menu 2 Set the 4 20 LVL Range entry to the volume of the entire vessel This setting should not have any compensation for the positioning of the level sensor 3 Set the Level Zero Offset entry to the difference between the bottom of the level sensor and the bottom of the vessel After these steps have been performed the PF2100 will automatically compensate the 4 20mA reading for its level offset The PF2100 will now apply compensation to the following Level reading on user interface Low level shutdowns High level contact behaviour Level reading via Modbus Expansion Card Information on navigating the PF2100 menus can be found in the PF2100 User Manual available at www profireenergy com PROFIRE rr ENERGY INC v1 3 Apr 11 2014 Page 5
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