Section 3 - Monitor Operation
25
Error code E2 is caused by a fault in the signal path. A signal path fault can only
be detected during a user initiated self test. If a signal path error is detected during
a self test, then an E2 error code will be shown on the LCD display. The signal path
check, which is made during self test, verifies that the peak-to-peak detector and
the setpoint threshold detectors are working properly. A signal path error could
mean that there is an internal fault within the 1900/27 monitor.
Error code E3 occurs when the monitor goes into a NOT OK situation. The monitor
continuously verifies that the system is OK. If it detects that a transducer input
signal is outside the expected range a NOT OK will result. A NOT OK may be
caused by faulty transducer field wiring, a bad transducer, or a bad connection.
3.2 LED Indicators
Four LED indicators on the 1900/27 monitor front panel show the status of the
monitor. They indicate whether the monitor and transducer are OK, if either the
Alert or Danger relay is in alarm, and whether the relays are bypassed. Table 3.2
summarizes how the LED operate.
Table 3.2: LED Indicators
on
Monitor is operating properly and receiving a valid transducer
signal
off
Monitor is not OK
flashing
Monitor was not OK and then returned to OK
Alert condition not detected
on
Alert condition detected. (Section 2.4.2 describes the 4 Alert relay
configurations and explains how to configure the relay.)
flashing*
Alert condition was detected but is no longer present
The vibration level is less than
on
The vibration level is exceeding the Danger setpoint
flashing*
The vibration level has exceeded the Danger setpoint and is now
less than the Danger setpoint
Monitor is operating normally
on
* Occurs only when the relay is configured as nonlatching and the vibration was
previously above the setpoint and has returned below the setpoint for that
particular relay.
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