Tech Support - FAQ - 50XM - 3

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      Question: What are the IDE signal connections on the 50XM converter module?

      Answer: The Module Converter has either a 20-pin or a 30-pin IDE connector. The following description will aid in making a test cable to connect a 55XC4000 simulator  to a remote mounted 50XM converter. For 30-pin converters, create a 20-pin to 30-pin adapter cable and leave pins 21-30 open.
      The key connections are defined below:



      Signal Name

      1 G3 Circuit Common (22 & 8D)
      2 22 X1
      3 1 Electrode 1
      4 2S Electrode 2 Shield
      5 1S Electrode 1 Shield
      6 2 Electrode 2
      7 V6 Converter Alarm
      8 3 Circuit Common
      9 46 P1/P2
      10 - Current Output: Negative
      11 8D Logic Pulse
      12 + Current Output: Positive
      13 16 Reference Voltage
      14 M1 Magnet Coil
      15 V5,45 Converter Alarm, P1/P2
      16 M2 Magnet Coil
      17 V4 Determined by Option
      18 V1 Determined by Option
      19 V3 Determined by Option
      20 V2 Determined by Option


Terminals 1S, 1, 2, and 2S
These are the measuring electrodes of the flowmeter, along with their shields. The shield of each
electrode is driven at the same potential as that electrode so as to minimize the effects of signal cable

Terminals 3 and 16
Terminal 3 is the circuit common of the magmeter measuring system, and is connected by the customer
to a quality earth ground at the flowmeter. Terminal 16 is referred to as reference voltage
and is proportional to the excitation current used for the primary. This voltage is regulated to 70
mV by the converter electronics. The wiring between the flowmeter and converter places 16 inside
a cable shielded by terminal 3.

Terminal 22
This terminal is referred to as X1 in the firmware, and can be configured for positive zero return or
totalizer reset. An isolated contact closure capable of passing 5 mA DC is required for activation of
the selected function.

Terminal G3
This is the circuit common for all digital functions, which include the terminal 8D 10 kHz unscaled
pulse and terminal 22. It is electrically connected to terminal 3 but should only be used for interface
with terminals 8D and 22.

Terminal 8D
This is an unscaled 0 to 10 kHz unscaled logic pulse representing zero to full scale (range value)
flow of the converter. The pulses are fixed at 30 μsec width and make a logic transition from 5 volts
to zero volts. A maximum cable length of 15 feet (5 m) should be used when measuring this output.

Terminals + and -
These terminals are the process current output. This is an active current output which can be configured
by firmware to various levels and operating modes. The converter can source 20 mA into a
maximum of 750 ohms load resistance.

Terminals V1 - V4
The exact nomenclature of these terminals is determined by the option card selected for the converter.
Designations 9/11 (V1/V2) and 9/11R (V3/V4) denote a scaled pulse output. This may be
either opto coupled or active, with 11 being active for forward flow and 11R for reverse. Terminals
9 are common for both flow directions.
When an RS323C data link option is specified, V1 and V3 are common, while the converter transmits
data out terminal V2 and receives it into V4.
When the RS485 data link is specified, the converter will transmit data out V1 and V2, (V2 normally
high) and will receive data into V3 and V4, with the logic signal at V4 normally high going low.

Terminals V5 and V6
These terminals are used for alarm indication from the converter, and may be either a pair of relay
contacts or the collector (V6) and emitter (V5) of an opto coupler. These contacts are closed during
normal operation and will open during any alarm condition shown on the converter display.

Terminals 44, 45 and 46
These terminals constitute the contacts of a form "C" relay which connects terminals 44 and 45 of
an unpowered converter and connects 45 and 46 when the relay is energized by the converter.
The firmware refers to these terminals as P1/P2, with an "on" or closed condition being one which
will energize the relay. The status of a P1/P2 connection may be considered analogous to that of
terminals 45 and 46.

Terminals M1 and M3
These terminals are intended to energize the magnet coils of the flowmeter. A shielded cable is
used for this purpose, with M1 being the inner conductor and M3 having a relatively low millivoltage.



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