Acromag microBlox Series, User Manual, Page: 20 / 29

microBlox® Transmitter/Alarm Carrier Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: 248-295-0880 - 20 -
http://www.acromag.com
- 20 - https://www.acromag.com
TROUBLESHOOTING
Diagnostics Table
POSSIBLE CAUSE POSSIBLE FIX
Alarm Contacts are “Chattering” or Alarm LED is blinking...
Have you applied dead-band
correctly? Increase the alarm dead-band setting (Refer
to Alarm Operation on Page 16 to see how
dead-band can combat chatter).
Output Signal Appears Noisy or Unstable...
Is the uB module fully inserted
into the carrier socket? Check that the module is fully plugged into
its socket. Note that uB45-B models are not
compatible with this carrier for alarms, but
acceptable for transmitter functionality.
Have you grounded your input
signal? Ungrounded inputs
require an earth connection as
noted in the module
specifications. Earth ground keeps isolated signals from
floating and provides a safe path to shunt
away destructive transient energy. If your
input source is not already earth grounded,
then refer to its connection diagram and
apply earth ground as noted (typically to the
IN- terminal of an input, see module wiring).
Voltage Output is noisy The voltage output of this carrier is driven
directly by the plug-in module. If noisy, the
field input signal may be floating or is not
earth grounded, or perhaps the output is not
earth grounded.
Check CJC Jumper Refer to your module specifications and
determine the required CJC jumper status.
Install or remove this jumper as required.
Voltage Output is Over-Loaded The 0-5V output can only drive up to 5mA
into loads greater than or equal 1KΩ.
Current Output cannot drive
full-scale current of 20mA. The current output load resistance is greater
than 550Ω. If load resistance is equal to or
less than 550Ω , the n the carrier’s 14 .5V
internal rail may have failed and the carrier
can be returned for repair or replacement.
Service & Repair Assistance
Plug-in modules are encapsulated and cannot normally be repaired, except for
possible reconfiguration and factory reprogramming. The carrier itself contains
solid-state components and requires no maintenance, except perhaps for periodic
cleaning. Additionally, the carrier enclosure is not meant to be opened for access
and can be easily damaged if snapped apart. Thus, it is highly recommended that a
non-functioning carrier be returned to Acromag for repair or replacement.
Acromag has automated test equipment that thoroughly checks and calibrates the
performance of each unit, and can restore or update firmware if needed. Please
refer to Acromag’s Service Policy and Warranty Bulletins, or contact Acromag for
complete details on how to obtain repair or replacement.