Alarm Relays; Programming The Alarm Relays; Trouble Alarms - Sigma 980 Operating And Maintenance Manual

4.4 Alarm Relays

4.4.1 Programming the Alarm Relays

4.4.1.1 Trouble Alarms

Trouble Condition
Low Memory Battery
U-Sonic Echo Loss (A pulse of
sound was sent but no echo was
received back)
Transducer Ringing
U-Sonic Failure
Modem Failure
RS485 Timed Out
Alarms can be programmed to activate based on certain conditions (low
battery, low memory, etc.). Refer to
When an alarm is tripped, an action is initiated (report via modem, dial a
pager, or set a relay). There are two types of alarms:
• Trouble Alarms
• Set Point Alarms
Trouble Alarms initiate an action when a trouble condition occurs.
For example, a relay may close when the memory is full.
Set Point Alarms look for trip points to be reached (either high or low or both)
before initiating an action. For example an initiated action may be the closing
of a relay when the water level exceeds 24 in. (60 cm) or drops below 4 in.
(10 cm).
1. From the Main Menu, select
2. Select an action to occur when the alarm is activated.
each Trouble Condition and its cause.
3. Enable one of the trouble conditions.
Table 26 Trouble Alarms
Internal memory battery voltage is too low. Change batteries.
The echo has been temporarily deflected by a change in site conditions such as floating
debris or foam in the channel, wind, etc.
Transducer is operating within the deadband.
Transducer not plugged in. Cable damaged. Transducer thermal sensor damaged.
Unable to initialize modem
Problem with communications between the flow meter and a remote ultrasonic sensor.
May indicate open thermal sensor.
Alarm Action(s):
Set Relay #1
Set Relay #2
Set Relay #3
Set Relay #4
Report via Modem
980 Alarms Flow Chart on page
OPTIONS> ADVANCED OPTIONS > ALARMS.
Table 26
Cause
Section 4
152.
shows
Page 73
Alarm Relays