MiniPuck Model ST132-06x0 Two-Wire TC/mV Transmitter
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Acromag, Inc. Tel:248-295-0880 Fax:248-624-9234 Email:
11
POSSIBLE CAUSE
POSSIBLE FIX
Software Fails to Scan Transmitter…
Bad USB Connection
Recheck USB Cable Connection
USB has not enumerated
the device.
Use the reset button on the USB isolator
to trigger renumeration of the transmitter,
or simply unplug/plug the USB cable to
the transmitter.
Communication or power
was interrupted while USB
was connected and the
configuration software was
running.
Close the current connection with the
software, re-scan the transmitter, select
and re-open the transmitter for
communication (or simply exit the
Configuration software and reboot it).
Output Erratic or Not operational…
Missing USB isolation
If your two-wire output current loop is
grounded, then connecting USB to the
transmitter will drive a ground loop
between your current loop and earth
ground at the PC. Always use USB signal
isolation, or alternatively, you can connect
directly to a laptop, which does not earth
ground its USB connection.
Output goes Overscale or Underscale…
This indicates that the input
signal is out of range, or an
input lead has broken.
Check your sensor connections to restore
operation. If connections are OK, then
your sensor value may be out of range, or
the unit has been mis calibrated.
Cannot Communicate with
Transmitter via USB…
Loop power ON to the unit?
Unit requires loop power connection, even
when connected to USB. The loop power
supply should also be present before
connecting to USB power.
Cannot Communicate with Transmitter via USB…
A missing USB Isolator could
cause a ground loop when
connecting to USB from a
Personal Computer.
A ground loop is created between a
normally grounded two-wire current loop
and earth ground of the PC USB port.
Only connect to USB via a USB isolator,
like the Acromag USB-ISOLATOR.
Otherwise, use a battery powered laptop
to configure the transmitter.
TROUBLE-SHOOTING
Diagnostics Table
Before attempting repair or
replacement, be sure that all
installation and configuration
procedures have been
followed and that the unit is
wired properly. Verify that
power is applied to the loop
and that your loop power
supply voltage is sufficient to
supply over-scale current into
the load (MIN 0.020*Road),
plus 7V at the module
terminals, plus any line drop.
If your problem still exists after
checking your wiring and
reviewing this information, or if
other evidence points to
another problem with the unit,
an effective and convenient
fault diagnosis method is to
exchange the questionable
unit with a known good unit.
Acromag’s Application
Engineers can provide further
technical assistance if
required. Repair services are
also available from Acromag.