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TTDM-128
User Manual
TO CLEAR THE CABLE
Investigate the cause of the alarm and conduct cleanup or maintenance accordingly.
HINT: If material causing a service alarm is spread throughout the system, it is often
useful to subdivide the system; see INVESTIGATING LEAKS AND FAULTS on page 42
for further information.
Fault Events
INTRODUCTION
Several conditions could lead to a fault alarm:
▪ A cable is disconnected.
▪ A cable is damaged.
▪ A connection is damaged.
▪ A specic SIM module is damaged.
▪ Communication is lost between the TTDM-128 and one or more SIM modules.
WHAT THE TTDM-128 MODULE DOES
The following shows how the alarm display would appear if the fault were caused by a
broken or disconnected cable:
CH01 USER_LABEL_0001
Cable Break
HH:MM DD-MON-YYYY
The TTDM-128 would display a different message for a different type of fault, such as a
loop imbalance or loss of communication to a specic SIM module.
When a fault condition is detected, the following occur:
▪ An audible alarm sounds.
▪ The red Fault LED illuminates.
▪ The LCD displays a message appropriate to the fault condition.
▪ The interfaces signal the event (Fault relay, 4-20 mA, and serial port).
TO REMEDY THE PROBLEM
Find the problem and rectify. This may mean reconnecting the cable, or nding the
damaged section and replacing it. If the cause of the fault is not obvious by visual
inspection, it is often useful to subdivide the system and test individual sections with a
TraceTek Portable Test Box.
As soon as the fault is rectied, the relay, LED, and LCD display return to their normal
state.
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