Max Machinery 286 Series User manual

INSTRUCTION MANUAL
286 - 300 SERIES TRANSMITTERS
286-
313: Transmitter with Amphenol Connector
286-
323: Transmitter, Weather - Tight, Explosion Proof*
286-
3x4: Transmitter with Output Level Shifter Option
286-31x-
5xx: Transmitter with Remote PCA
TABLE OF CONTENTS
General Description................................................... Pg 2
Specifications ............................................................ Pg 3
Mechanical Installation ............................................. Pg 4 -5
Outputs, Options, and Indicators............................... Pg 6 -8
Calibration................................................................ . Pg 9 -10
Maximum Transmission Distance............................. Pg 11 -12
K-
factors.................................................................... Pg 13
Appendix A: Remote Mount Transmitter ................. Pg 14 -15
Appendix B: Output Level Shifter Option ................ Pg 16
Schematics:
286-313-
201 RVDT Schematic
181-000-
250 Interconnect Schematic
* U.L. Class I, Group C & D
Class II, Group E, F & G
286-300-
350 © 2002, Max Machinery, Inc.
2
nd
Rev: 4/03, added Appendix A and B
Max Machinery, Inc. reserves the right to make changes to the product in this instruction manual to improve
performance, reliability, or manufacturability. Contact MMI for the latest available specifications and
performance data.
Although every effort h
as been made to ensure accuracy of the information contained in this instruction
manual, MMI assumes no responsibility for inadvertent errors.
Discontinued

General Description
The 286- 3XX Series Transmitter converts the rotary motion of the metering elements insi de a Max Flow
Meter into a frequency proportional to the flow rate. This is accomplished using a differential transformer
technique, which puts no torque requirements on the flow measuring elements and enables extremely fast
output response rates. A micr oprocessor measures position changes of the metering elements and generates
the corresponding output pulse stream.
When used with the Max Series 210 Piston Flow Meters, these transmitters will compensate for cyclical
variations in rotational velocity of the metering pistons (inherent in the four piston design) to give a steady
output frequency.
The 286- 3XX Series circuitry has self - calibration routines that can be initiated with the push of a button.
This simplifies matching of flow meter and transmit ter in the event that field maintenance is required.
The Model 286 features an antidither output buffer. If the flow reverses (for less than ½ revolution of
the flow meter), and then returns to the forward direction, the transmitter pulse output will re present only
the total forward flow. The two - phase output is not buffered; it is an instantaneous indicator of metering
element position. The antidithering is a useful feature when the flow stops or is very low, and vibration or
hydraulic noise causes th e flow metering elements to reverse direction.
The transmitter can be powered from a 4.5V to 30VDC supply. The user can select between two types
of outputs: a square wave output or a two
- phase output where the frequency of each phase is half that of th e
square wave output. The user can select from square wave outputs of 24, 50, 100, 200, 300, 500, 600 or
1000 pulses per revolution, or two -phase outputs of 12, 25, 50, 100, 150, 250, 300 or 500 pulses per
revolution (on each phase).
General Description
286-300- 350 © 2002, Max Machinery, Inc.
(2)
Discontinued

Specifications
Supply Voltage........................................................................ 4.5 VDC to 30 VDC
Supply Current.................................... 12mA Typical, 20mA Maximum (+ Load)
Output (5.0V Supply) .......................................................................................... Hi Lo
No Load.............................................................................................. 4.80 V 0.04 V
2.5k Load to Common........................................................................ 4.60 V 0.04 V
2.5k Load to +5 Volts......................................................................... 4.80 V 0.25 V
Short Circuit Current1.........................................................................
45 mA
Output Impedance ............................................................................... 100
Rise Time ............................................................................... 0.15 uS (90%)
Fall Time ................................................................................ 0.15 uS (90%)
Maximum Frequency ......................................................................... 60 kHz
Minimum Frequency.............................................................................. 0 Hz
Maximum Rotor RPM...........................................................................
3600 RPM
Minimum Rotor RPM.................................................................................. 0 RPM
Pulse Width Variation (between consecutive rising edges) ..................
15% max
Output Lag
2................................................................................................
0.25 mS
Ambient Temper ature Limits
3
Electronics
Storage........................................................................ - 40°C to 85°C
Operation.................................................................... - 40°C to 80°C
Stator ....................................................................... - 40°C to 130°C (265°F)
Estimated Microprocessor Memory Lifetime
4
80°C.................................................................................................... 20 yrs.
55°C and below ................................................................................
>50 yrs.
Antidither Range
Pulse Output ..........................................................................
1/2 Revolution
Switching of Pin #6 ………………………………………….1/4 Revolution
1
Continuous Short Circuit is not recommended. The sum of output currents during operation should not exceed 30 mA (i .e.: 30
mA on one output or 15 mA on two outputs).
2
Events are seen as output transitions 0.25 mS after they occur
3
Temperature of metered fluid will affect transmitter temperature, see pg. 4
4
See pg. 8 for more information
Specifications
286-300- 350 © 2002, Max Machinery, Inc.
(3)
Discontinued

Installation
Mounting: The Model 286 transmitter screws on and off of the flow meter. Due to the random location of
the starting point of the threads, one transmitter will probably not line up with the “in” and “out” ports of the
flow meter like another will. The electrical outlet of the transmitter can be rotated clockwise or counter
clockwise one turn by loosening the clamping screw. See the Transmitter Diagram (
next page ).
Two flats are provided for installing the transmitter on the flow meter. Care should be taken when installing
and removing the transmitter. The wire of the stator is of fine gauge and can be easily damaged.
Moisture Protection: The Amphenol and the weather - tight, explosion - proof transmitte rs both have their
circuitry enclosed in a liquid -tight and vapor- tight enclosure. All joints are sealed by welding or O - rings. If
a weather tight condition is desired, either the Amphenol or the weather - tight, explosion - proof transmitter
will work. To seal the weather - tight transmitter, pipe dope must be used on the liquid - tight conduit. If an
explosion proof transmitter is required, a potted seal fitting must be used.
If a transmitter is located outside and is not properly sealed, moisture may form inside the housing. This
will cause the circuitry to give an inaccurate output or, in some cases, no output at all. In the long run, this
will cause corrosion and failure.
Temperature Considerations : High ambient temperatures (> 120°F/ 50°C) should be avoided if possible.
It is a good idea to locate the transmitter away from hot spots such as steam pipes, ovens and heaters. The
electronics of the 286 Series Transmitters are rated for operation up to 80° C (175° F). Because some heat
travels from the flow meter to the transmitter electrical enclosure, the temperature of the electronics is a
function of both the ambient and the flow meter temperature. The graph below shows the relation between
the maximum ambient transmitter temperature and the flu id temperature through the flow meter.
The stator of the 286 transmitters is insulated with an electrical coating that is rated to 130°C which limits
the maximum flow meter fluid temperature to about 130°C (265°F).
Mechanical Installation
286-300- 350 © 2002, Max Machinery, Inc.
(4)
Transmitter High Temperature Limits
0
10
20
30
40
50
60
70
80
90
0 20 40 60 80 100 120 140 160
Flow Meter Fluid Temp (°C)
Ambient Temp (°C)
SAFE
OPERATING
REGION
Stator
Limit
Limit for Transmitter Electronics
Discontinued

Transmitter Diagram
Mechanical Installation
286-300- 350 © 2002, Max Machinery, Inc.
(5)
210 Series
Flow Meter
LOOSEN TO ROTATE
ELECTRICAL HOUSING
IN
Transmitter - Flowmeter
Threaded Connection
Rotor Assembly
Wrench Flats
Clamp Screw
Circuit Board
Connector
1/ 2" NPT or
Weather tight
Amphenol
O-Ring
Retaining
Ring
O-Ring
Stator Assembly
O-Ring
Discontinued

Outputs, Options and Indicators
Connections:
The interconnect drawing number 181 -000- 250 at the end of this manual provides detailed
information on interfacing to Max signal conditioners and indicators.
Output Protection:
Voltage should no t be applied to any output (terminals 4, 5, and 6). If a low voltage,
5V or less, is
accidentally applied to an output, resistors and diodes will protect the circuitry. Higher voltages will
destroy the resistors and/or diodes.
Grounding:
S1 - 1: This switch, (labeled GND) connects Common and Case directly together.
S1 -2: This switch, (labeled FILTER) connects Common and Case through two back- to - back 15 uF
capacitors.
By using either S1 - 1 or S1 -2, the effects of electrical noise on the transmitter ca n be reduced. If the
system is not grounded at the indicator or if the flowmeter is not physically grounded through its
plumbing, use S1 -1. If the system is grounded at the indicator, use S1-2. This allows electrical
noise between the case and the trans mitter circuitry to be reduced without causing ground loop
problems. To activate either switch, depress the side that is numbered on the switch (and labeled
‘GND’ or ‘FILTER’ on the printed circuit board).
Meter Selection:
S4 - 1: Depress side that cor responds to meter type. The 210 setting is for Max Series 210 Piston
Flow Meters, and 220/240 is for Max Series 220 Gear and 240 Helix meters.
When used with Max Series 210 Piston Flow Meters, the Model 286 will compensate for the non -
constant rotationa l velocity of the crankshaft, yielding a steady output frequency at a constant flow
rate. If this switch is placed in the wrong position (for either a 210 or 220/240 meter), the output
frequency will oscillate
20% about its nominal value, four cycles per revolution.
Two - Phase or Square Wave Select:
S4 -2: Depress side that corresponds to desired output. ‘2PH’ gives a 2- phase quadrature output
with the two phases separated by 90° (Ph A on Terminal 5 and Ph B on Terminal 6). The ‘COMB
OUT’ setting gi ves a single square wave output that combines the information in the two phases into
a single output of double the frequency (Combined Output on Terminal 4, Direction on Terminal 6).
If S4 - 2 is set wrong, an unexpected output signal will result since the same output circuitry is used
for the two distinct output options (see chart below).
286-300- 350 © 2002, Max Machinery, Inc.
(6)
Options & Stat us Indicators Outputs, Options & Indicators
Connector
Terminal(s)
S4-2 = 'COMB OUT'
(combined output)
S4-2 = '2Ph'
(2-phase output)
4,5 Pulse Output Phase A
6 Direction Phase B
Terminal Output Signals vs. S4-2 Setting
Discontinued

Output Frequency Select:
S3: Rotary switch allows selection of output resolutions of 24 to 1000 pulses per revolution (square
wave output), or 12 to 500 pulses per r evolution (per phase) if the 2 - phase output option is selected.
The resolution can be changed while the tachometer is operating, and the new value will take effect
immediately. See chart below for resolution at each switch setting.
J2 : Header for Factory Programming Only
D10
: Direction/Phase B (Terminal 6
Status) (High = Green, Low = Red)
*
D11
: Output/Phase A (Terminal 4/5
Status) (High = Green, Low = Red)
S4
-
2:
Output Select (2 - Phase or Combined
Output) Assigns outputs of Terminals 4 - 6 and
D10 and D11.
S5:
Calibrate Stator Offsets
(and Angle). Need S3 in
position 0 to start Calibration.
S3:
Output Frequency Select
And Calibration Enable
D7
: Microcontroller Memory
Status (On = Fail)
S4
-
1:
Select Meter Type
Type
Stator Phase A Testpoint
Stator Phase B Testpoint
Common Testpoint
S1 - 1: Ground
S1 - 2: Filter
Terminal Block
1. Case (Green)
2. Common (Black)
3. Power 5 - 30VDC (Red)
4. Combined Output (White)
5. Phase A Out (Orange)
6. Phase B Out or Direction (Blue)
S2
: Reset Microcontroller
D8 : Flow too low to cal ibrate
D9 : Calibration Active
D3
-
D6
: RVDT Rotor Position
Indication (4 LED’s)
S3
2-Phase
Combined
Position
Output
Output
0 0 (Calibrate) 0 (Calibrate)
1 12 24
2 25 50
3 50 100
4 100 200
5 150 300
6 250 500
7 300 600
8 500 1000
9
*
*
Cycles per Revolution
* Not Specified, Usually same as S3=8
286 -300- 350 © 2002, Max Machinery, Inc.
Outputs, Options & Indicators
(7)
* Phase A leads Phase B when meter
is turning CCW (forward flow on
piston and gear style meters, reverse
flow on helix meters). Indicated at
terminal 6 by a 5 VDC signal and the
changing of D10 to green.
Discontinued

Output Indicators:
D10, D11: These bi - color (red, green) LEDs indicate the status of the outputs. If the 2 - phase output
mode has been selected, the state of Phase A and Phase B are each shown on the corresponding
LEDs (‘O UT/
A’ and ‘DIR/ B’). If the combined output mode has been selected, the LED labeled
‘OUT/
A’ shows the status of the pulse output channel, and the LED labeled ‘DIR/ B’ indicates
the direction.
Microprocessor Reset:
S2: In the event that the tachometer
does not appear to be operating correctly, resetting the
microprocessor by momentarily depressing S2 may solve the problem. While the reset button is
depressed, the ‘MEM FAIL’ LED will turn on, and if the memory is good, the LED should turn back
off when the button is released.
RVDT Rotor Position Indication LED’s:
D3 - D6: These LED’s provide a graphical representation of the position of the RVDT rotor. This
can be a helpful troubleshooting aid when trying to determine if a meter is turning or not. Th e
rotational pattern observed on the LED’s corresponds directly to the rotational speed of the RVDT
rotor. At high speeds, the LED’s will just look like they are blinking; the human eye can no longer
discern the direction of motion. At very high speeds t he blinking will not even be obvious and they
will all appear to be a constant brightness. At these higher speeds, a divide -by-ten feature can be
activated by pressing S5 (the ‘CAL’ button, make sure S3 is not in the 0 position, otherwise the
calibration routine will be run!). This only slows down the Rotor Position indication LEDs, the
output frequency does not change.
‘CAL’ LED:
D9: This LED changes color (red to green or green to red) 4 times per revolution while the
microprocessor is performing the calibration routine on the stator coils. When calibration is
complete, it will turn off. See Calibration Section for more information on calibration procedures.
‘SLOW’ LED:
D8: If a calibration is initiated but the flow rate is too low to give acceptab le results, the calibration
will be aborted, and this LED will light up red for 10 seconds. See Calibration Section for more
information on calibration procedures.
‘MEMORY FAIL’ LED:
D7: The microprocessor continually checks the integrity of its progra m storage memory. If one or
more memory values do not read what they are supposed to, this LED will turn on. Two possible
causes of memory failure are prolonged operation/storage at temperatures exceeding the ratings and
transient voltages applied to inp uts and/or outputs that exceed ratings. If the transmitter does not
appear to be functioning correctly and this LED is on, the unit should be sent back to the factory for
service.
Outputs, Options & Indicators
286-300- 350 © 2002, Max Machinery, Inc.
(8)
Discontinued

Rotational Speed of Piston Meter Crankshaft At Constant Flow
0 90 180 270 360 450 540 630 720
Crankshaft Angle
Crankshaft Rotational
Speed
Calibration
The coils of the Model 286 stator, the printed circuit b oard, and the flow meter need to be calibrated as
one set. When used with any flow meter model, the calibration procedure initiates a routine that
determines the offsets needed to balance the output signals from all of the coils. When used with a 210
ser ies piston flow meter, the calibration procedure includes an additional routine that measures the
angular position of the stator with respect to the meter. This allows the transmitter to compensate for
cyclical variations in rotational velocity of the met er, resulting in a steady output frequency. When S4 -
1 is in the 210 position (piston meter), the calibration will automatically include both of the routines
described above. If S4 -1 is in the 220/240 position (Gear or Helix Meter), only the coil balanci ng
routine will be performed.
The recommended flow range for calibration is that which will turn the meter at 20 - 500 rpm. Lower
flow rates (resulting in rotor speeds below 20 RPM) will cause the ‘SLOW’ LED to come on and the
calibration will not take place. Successful calibration will occur at higher flow rates (rotor speeds above
500 RPM) but the results may not be as good as those which would be obtained at a lower flow rate. A
flow rate resulting in a flow meter rotor velocity of 100 rpm will give
good calibration results.
When doing a calibration on a piston meter, it is critical that the flow rate remains constant (less than
10% variation) for the routine that determines the stator angle to be successful. When a steady flow
passes through a fou r- piston meter, the crankshaft speeds up and slows down 4 times per revolution.
The phase of this cyclic speed variation is determined during calibration by finding the position of the 4
speed peaks in a revolution. These speed peak locations are measur ed for 8 revolutions (32 peaks), then
run through an averaging procedure. Once this is done, the tachometer can internally compensate for the
speed variations to output a steady frequency under steady flow conditions.
Error can be introduced into this ph
asing procedure if the system flow rate is pulsating (i.e.: driven by a
piston pump). If there are peaks in the flow rate that overshadow the speed peaks due to the 4 - piston
geometry, the calibration routine will incorrectly determine the phase of the cyc lic speed variation and
will subsequently apply the compensation out of phase.
286-300- 350 © 2002, Max Machinery, Inc.
Calibration
(9)
Discontinued

The phase balancing routine that occurs for all types of meters requires 16 revolutions of the meter to
reach completion. The ‘CAL’ LED changes color (red to green or gree n to red) 4 times per revolution,
or 64 blinks for the entire calibration. The angular position determination (phasing) requires 8
revolutions, so the ‘CAL’ LED will blink an additional 32 times after the 64 phase balancing blinks
when calibration is perf ormed on a piston meter. If the flow is stopped partway through a calibration,
the blinking will stop and the calibration will not reach completion since it requires a fixed number of
meter revolutions. In such a case, a new calibration should be done at a steady flow rate.
When to Calibrate
Calibration should be performed under the following conditions:
1. The Model 286 Tachometer is mated to a flow meter to which it has not been previously
calibrated.
2. If the circuit board of the Model 286 is changed.
3. If the connector between the pickup coils and the circuit board is reversed.
4. If it is suspected that the output signal contains more frequency modulation than it should have.
(i.e.: Pulse widths vary by more than
15%, and variati ons are not random, but cyclical at 4 times
per revolution)
Calibration Procedure
1. Ensure that S4 - 1 is set correctly (210 for piston meters, 220/240 for gear or helix meters).
2. Set up a steady flow rate through the meter that results in a meter rpm between 20 and 500, ideally
somewhere around 100 rpm. The position indication LED’s in the center of the circuit board can aid in
rpm determination (i.e.: at 100 rpm, each light will blink 10 times in 6 seconds).
3. Rotate S3 to the ‘0’ position to
enable calibration.
4. Press the ‘CAL’ button, S5. If the ‘SLOW’ LED (D8) comes on, wait 10 seconds for it to go off,
increase the flow rate and try pressing the ‘CAL’ button again.
5. Wait for the ‘CAL’ LED (D9) to stop blinking and turn back off. While the calibration is active, the
position indication LED’s in the center of the board will pause. As soon as the calibration is complete,
they will resume activity.
6. The calibration is now complete. Return S3 to the appropriate setting to get th
e desired number of
output pulses per revolution.
Calibration
286-300- 350 © 2002, Max Machinery, Inc.
(10)
Discontinued

Maximum Transmission Distance
The graph below indicates typical conductor capacitance loads versus cable length for several types of
cable. For instance, 1000 feet of 7 conductor #18 gauge stran ded wire will put a 0.04 uF capacitive load on
the output of the 286
- 3XX Series Transmitters.
Maximum Transmission Distance
286-300- 350 © 2002, Max Machinery, Inc.
(11)
Cable Capacitance vs. Length
0.01
0.1
1
10
100
1 10 100 1000
Cable Length (feet)
Capacitance (uF)
2 or 4 Conductor Shielded Cable
Belden 8762 V1000 (20 GA), Belden 8723 (2 Shielded Pair)
7 Conductor Cable
National Type N W718-J (18 GA)
4 16 Gauge Wires in EMT Conduit
RG 59U Coaxial Cable
Columbia 1112 Foam
Discontinued

Maximum Transmission Distance (continued)
The graph below shows the relationship between output capacitance loading and rise and fall time for
the Model 286 -3XX output signal. For instance, with 0.04uF load capacitance (1000 ft. shielded cable typ.)
the rise/fall time is 10 uS. Consequently, the absolute maximum frequency the Model 286 could transmit
would be 50 kHz (frequency = 1/time, where time include s the rise and fall times for one cycle). See
following page for maximum frequencies possible with different flow meters.
286-300- 350 © 2002, Max Machinery, Inc.
(12)
286-313 Output Rise and Fall Time vs. Load Capacitance
0.1
1
10
100
1000
0.001 0.01 0.1 1
Output Capacitance Load (uF)
Rise and Fall Time (uS)
(rise and fall time measured between 10% and 90% of full output swing)
Maximum Transmission Distance
Discontinued

K- Factors
K-factors represent the number of pulses the transmitter outputs per unit volume of fluid passing through the
flow meter. This number is dependent on the flow meter and the transmitter resolution setting (switch S3).
Max Machinery indicators can be adjusted to display the desired units (ccs, lbs, gallons, quarts, etc.) by
using the K - factor.
Flow meters ar e multi - point calibrated at the factory. The K -factor varies slightly with flow rate. A graph
of this K-
factor is provided for each customer. The values shown below are typical. If the output resolution
setting is changed (via S3), the K- factors will s cale proportionally:
**Maximum Count Speed of Max Machinery Indicators:
Model 120 <= 7500 Hz
Model 121 <= 20,000 Hz
If the frequency output at the application’s maximum flow rate exceeds the indicator’s c ount speed, then
the transmitter resolution setting (S3) will need to be adjusted to proportionally reduce the
meter/transmitter’s K -Factor.
K- Factors
New K- factor E xisting K factor
New
Resolution
E xisting Resolution
286 -300- 350 © 2002, Max Machinery, Inc.
(13)
Min
(@24 pulses/rev)
Max
(@1000 pulses/rev)
Min
(@24 pulses/rev)
Max
(@1000 pulses/rev)
213 27.6 1150.0 1.8 828 34,500
214
2.28 95 10 380 15,870
215
0.504 21.0 40 336 14,000
216
0.142 5.9 100 237 9,870
220
2.28 95.0 3 114 4,760
221
1.02 42.5 15 255 10,630
222
0.506 21.1 38 320 13,350
241
0.386 16.1 190 1,220 50,900
242
0.132 5.50 540 1,190 49,520
243
0.0417 1.74 1400 973 40,500
244
0.0139 0.579 2800 649 27,040
245
0.00396
0.165
5600
370
15,400
*typical values; may vary by up to 5% on specific flow meters.
286-3xx K-Factor Ranges (pulses/cc) with various Max flow meters*
Combined Output
K-factor Range (pulses/cc)
Maximum
Rate
(liters/min)
Model
Maximum Output Frequency Range
(Hz)**
Discontinued

286-313- 500 Remote Mount Transmitter (Aluminum Housing)
286-313-
525 Remote Mount Transmitter (Polycarbonate Ho using)
286-314-
500 Remote Mount Transmitter with Output Level Shifter (Aluminum Housing)
286-314-
525 Remote Mount Transmitter with Output Level Shifter (Polycarbonate Housing)
General
The 286-313-
500 and 286 -313- 525 Remote Mount Transmitters allow the tra nsmitter circuitry to be
located separately from the flowmeter and RVDT stator. This may be desirable when a smaller
flowmeter package is required, when the flowmeter is subjected to high ambient temperatures (ie:
environmental chamber), or for any number of other reasons. Both the remote circuit board housing and
the stator housing are fully sealed. The functionality of the remote transmitter is identical to the
standard transmitter. There are some differences in appearance and installation due to the
different
housing and extra connections to the remote stator cable: these are addressed in the information below.
Mounting
The cylindrical aluminum stator housing mounts on the flow meter. Care should be taken when
installing and removing the stator h ousing. The wire of the stator is of fine gauge and can be easily
damaged. Two wrench flats are provided for installing and removing. The stator housing only needs to
be tightened with enough torque to compress the O - ring and prevent unscrewing due to m echanical
vibrations and cable forces. 10 - 15 ft - lbs. of torque is sufficient. DO NOT OVERTIGHTEN!
The sealed aluminum or polycarbonate NEMA 4 box containing the circuit board has mounting holes in
the four corners that are accessed by removing the cover . The polycarbonate box has 0.175” dia. holes
with space for a 0.265” or smaller head. The aluminum box has 0.185” holes with space for 0.300” or
smaller head. An 8 - 32 socket head cap screw works well for both.
Appendix A: Remote Mount Transmitter
286-300- 350 © 2002, Max Machinery, Inc.
(14)
Discontinued

Temperature Considerations
Continuo us exposure of the stator housing and the circuitry to high ambient temperatures should be
avoided if possible. It is a good idea to locate both of these components away from hot spots such as
steam pipes, ovens, and heaters. The circuitry in the remote
enclosure is rated for operation up to 80°C,
so this is the limit on the ambient air temperature at the enclosure. At the flowmeter, the metered fluid
temperature should not exceed 130° C (265° F) (stator insulation limitation) and the ambient
temperature should not exceed 105° C (220° F) (PVC cable jacket limitation).
Outputs, Options, Indicators
See pages 6 - 8 of the manual for detailed explanations of the transmitter’s outputs, options, and
indicators. The diagram below points out the location of the f eatures on the printed circuit board.
Appendix A: Remote Mount Transmitter
D1
0
: Direction/Phase B (Terminal 6
Status) (High = Green, Low = Red)
S4
-
2:
Output Select (2 - Phase
or Combined Output)
S5:
Calibrate Stator Offsets
(and Angle). Need S3 in
position 0 to start Calibration.
S3:
Output Frequency Select
And Calibration Enable
D7
: Microcontroller Memory
Status (On = Fail)
S4
-
1:
Select Meter Type
Type
Stator Phase A
Stator Phase B
Common
S1 - 1: Ground
S1 - 2: Filter
Terminal Block
1. Case (Green)
2. Common (Black)
3. Power 5 - 30VDC (Red)
4. Combined Output (White)
5. Phase A Out (Orange)
6. Phase B Out or Direction (Blue)
S2
: Reset Microcontroller
D8 : Flow too low to calibrate
D9 : Calibration Active
D3
-
D6
: RVDT Rotor Position
Indication (4 LED’s)
S3
2-Phase
Combined
Position
Output
Output
0 0 (Calibrate) 0 (Calibrate)
1 12 24
2 25 50
3 50 100
4 100 200
5 150 300
6 250 500
7 300 600
8 500 1000
9
*
*
Cycles per Revolution
* Not Specified, Usually same as S3=8
Testpoints
J4: Stator Cable Terminal Block
Wire Colors Denoted on PCB
“DRN” indicates the Drain wire
Connected to cable shielding
D11
: Output/Phase A (Terminal 4 & 5
Status) (High = Green, Low = Red)
286-300- 350 © 2002, Max Machinery, Inc.
(15)
Discontinued

286- 314: Transmitter with Amphenol Connector, Level Shifter Option
286-
324: Transmitter, Weather -Tight, Explosion Proof, Level Shifter Option
286-314-
500: Remote Transmitter (Aluminum Housing), Level Shift er Option
286-314-
525: Remote Transmitter (Polycarbonate Housing), Level Shifter Option
General
Both the standard and remote transmitter circuit boards have the capability for additional circuitry that
gives output voltage levels equivalent to the power supply voltage. For example, if the transmitter is
powered with +12 Volts the output will be a 12V square wave. The circuit board used in the level
shifter version is identical to the standard circuit board, with the exception of some additional
compon ents (R29,R30, and U9) and some that are absent (R23, R24, and D1). The output
specifications, some different than those on pg. 3 due to the level shifter, are listed below. All other
specifications from pg. 3 not reprinted here remain unchanged.
Outp ut Level Shifter Specifications
Supply Voltage........................................................................ 4.5 VDC to 30 VDC
Supply Current.................................... 38mA Typical, 32- 43 mA Range (+ Load)
Output (12.0V Supply) ........................................................................................ Hi Lo
No Load.............................................................................................. 12.0 V 0.1 V
2.5k Load to Common........................................................................ 11.0 V 0.1 V
2.5k Load to +12 Volts....................................................................... 12.0 V 1.0 V
Short Circuit C urrent
5.......................................................................
120 mA
Output Impedance ............................................................................... 100
Rise Time ................................................................................. 0.8 uS (90%)
Fall Time .................................................................................. 1.0 uS (90%)
Maximum Frequency ......................................................................... 60 kHz
Minimum Frequency.............................................................................. 0 Hz
5
Continuous Short Ci rcuit is not recommended. The output current should not exceed 30 mA per output.
286-300- 350 © 2002, Max Machinery, Inc.
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Appendix B: Output Level Shifter Option
Discontinued