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Max Machinery 276-5 Series Instruction Manual

4-20ma transmitters
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INSTRUCTION MANUAL
276-5XX SERIES 4-20MA TRANSMITTERS
276-515 4 Phase (210 Meters) Amphenol
276-525 4 Phase (210 Meters) Weather-Tight, Explosion proof (UL, CSA)
276-517 7 Phase (220/240 Meters) Amphenol
276-527 7 Phase (220/240 Meters) Weather-Tight, Explosion proof (UL, CSA)
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pg 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pg 3
Grounding / Typical Wiring Schematics . . . . . . . . . . . . . . . . .Pg 6
Zero and Span Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . .Pg 7
Damping / Over Range Indication . . . . . . . . . . . . . . . . . . . . .Pg 8
PCA Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pg 9
Ripple Adjustment (276-515 and 276-525) . . . . . . . . . . . . . .Pg 10
Schematics:
D276-515-200
D276-517-200
276-515-350 © 2006, Max Machinery, Inc.
Max Machinery, Inc. reserves the right to make changes to the product in this Instruction
Manual to improve performance, reliability, or manufacturability. Consequently, contact
MMI for the latest available specifications and performance data.
Although every effort has been made to ensure accuracy of the information contained in
this Instruction Manual, MMI assumes no responsibility for inadvertent errors.

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  • Page 1: Table Of Contents

    D276-517-200 276-515-350 © 2006, Max Machinery, Inc. Max Machinery, Inc. reserves the right to make changes to the product in this Instruction Manual to improve performance, reliability, or manufacturability. Consequently, contact MMI for the latest available specifications and performance data.

  • Page 2: General Description

    The Max 276 Series Transmitters generally provide faster response to flow rate changes than pulse type Transmitters. This is particularly true with the 210 series meters at low flow rates. ( 2 ) 276-515-350 © 2006 Max Machinery, Inc.

  • Page 3: Specifications

    20mA ........11.5 Volts 276-515-350 © 2006 Max Machinery, Inc.

  • Page 4: Installation: Mounting / Dimensions

    Transmitter housing [shown below]. Two flats are provided for screwing the Transmitter on to the Flowmeter. Care should be taken when slipping the Transmitter on and off. The stator wire can be easily damaged. ( 4 ) 276-515-350 © 2006 Max Machinery, Inc.

  • Page 5: Moisture Protection / Temperature Considerations

    Flowmeter. This is because the magnet that generates the voltage in the stator is affected slightly by temperature. The figure [bottom, right] shows typical percentages of error. 276-515-350 © 2006 Max Machinery, Inc. ( 5 )

  • Page 6: Grounding / Typical Wiring Schematics

    In a typical installation, the Transmitter case is grounded through the plumbing. An alternative is to make the ground connection at the “case” terminal on the printed circuit board. ( 6 ) 276-515-350 © 2006 Max Machinery, Inc.

  • Page 7: User Options & Adjustments

    2 7 6 - 5 X 5 2 7 6 - 5 X 7 SWITCH POSITION GAIN GAIN GAIN GAIN 1294 3620 1290 3612 1589 1537 233.6 99.4 278.3 42.3 118.4 50.4 276-515-350 © 2006 Max Machinery, Inc. ( 7 )

  • Page 8: Damping / Over Range Indication

    Transmitter must be kept low enough so that the output is not saturated. This may mean that the average full scale output current will have to be less than 20mA to avoid clipping the peaks in the output signal, as indicated in the figure below. ( 8 ) 276-515-350 © 2006 Max Machinery, Inc.

  • Page 9: Pca Drawings

    (2.1:1 STEPS) 276-517/527 CASE GROUNDING JUMPERS: + OUTPUT (SUPPLIED WITH - OUTPUT JUMPER IN “FILTER” POSITION.) R49,50,51 DAMPING R64 ZERO L1 OVERRANGE LED R47 OUTPUT SPAN S1 OUTPUT RANGE (2.1:1 STEPS) 276-515-350 © 2006 Max Machinery, Inc. ( 9 )

  • Page 10: Ripple Adjustment (276-515 And 276-525)

    This means that it will take a maximum of 45° on the Stator Adjustment Screw to find the best location. OUTPUT RIPPLE VS STATOR POSITION WORST STATOR BEST STATOR POSITION POSITION 50% Ripple 10% Ripple ( 10 ) 276-515-350 © 2006 Max Machinery, Inc.

  • Page 11: General Considerations

    If a system is dampened so that the response rate is longer than the period of one revolution of the meter, the accuracy of the display is increased. The accuracy of the system can never be better than that of the Flowmeter. 276-515-350 © 2006 Max Machinery, Inc. ( 11 )
  • Page 12 The electronic converter of any meter will add its share of noise. For instance, DC Transmitters produce some ripple in their output due to the sinusoidal nature of the induced voltage in the armature coils. ( 12 ) 276-515-350 © 2006 Max Machinery, Inc.

This manual is also suitable for:

276-515276-525276-517276-527

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