DVG IOM-ITVC-Basic-05, Installation, Set-Up, Operating & Service Manual

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ITVC Series – Intelligent Total Valve Controller IOM-ITVC-Basic-05
DVG AUTOMATION S.p.A.
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13 Troubleshooting
ITVC has a powerful diagnostic program to monitor the operation of system “ITVC-Actuator-Pneumatic/Hydraulic”
control unit. In case of ITVC malfunction and depending on the type of malfunction the ITVC raises an Alarm, a MRT
alarm, a Warning. ITVC signals the presence of Alarm and MRT alarm remotely by the Monitor relay and locally by
the icon in the HOME page. The presence of Warning is locally signalled by the icon . The LED of
pushbutton lights up red, in case of Alarm and fuchsia, in case of warning. The paragraph “ Alarm, MRT alarm,
and Warning
” describes the difference between the malfunctions. The procedure described in the paragraph
“ Visualization of Alarms and Warnings ” allows viewing the list of current Alarms, MRT alarms and Warnings. Here
below are the tables of all possible Alarms, MRT alarms and Warnings. They includes also the potential cause and the
suggested action to solve the problem. In general Alarms and Warning (except MRT Alarm), disappear automatically
from the list when the malfunction is solved. However it is also available the reset procedure to manually clear the
Alarm/Warning, one at a time. Reset will be effective only if the issue will be solved. Only the Alarms and Warnings
corresponding to the active ITVC functions can be detected (i.e. if the function “Line Break” is off, the relevant
Alarm/MRT alarm and Warning cannot be generated). If ITVC performs the safe action, in the alarm list appears the
message “ Safety action ”.
MRT alarm : if in the alarm list (visible by the icon ), there is the alarm “ MRT timer ”, an MRT alarm is present
and the safe action will be done when the MRT time will expire and if the alarm will be still present. In the paragraph
“Instantaneous measures sub-menu, MRT”, chapter MEASUREMENT, is described the procedure to view the list of
current MRT alarms and the remaining time. If the failure is not repaired before than the time expires, the ITVC drives
the actuator in safe position. In the above paragraph is also described the procedure to reset the MRT alarms, one at a
time. Reset will be effective only if the issue will be solved. MRT alarms cannot be reset by the procedure described in
the paragraph “ Visualization of Alarms and Warnings ”.
ALARM TABLE
Alarm displayed Potential cause Action
NO VOLTAGE
Power supply failure
Check power supply
Reset alarm. If alarm persists, replace
ITVC
24V FAIL
Power card failure
Reset alarm. If alarm persists, replace
power card
24V REG FAIL Power card failure
Reset alarm. If alarm persists, replace
power card
24V SOV FAIL
Probable short-circuit on SOVs
Disconnect SOVs. Check which one is
short circuited and act accordingly
24VEXT1 FAIL
Probable short-circuit on EXT1 circuit
Disconnect EXT1. Check short circuit and
act accordingly
24VEXT2 FAIL
Probable short-circuit on EXT2 circuit
Disconnect EXT2. Check short circuit and
act accordingly
24V TO TERMINAL FAIL
- Probable short-circuit on SOVs
- Power card failure
- Disconnect SOVs. Check which one is
short circuited and act accordingly.
- Reset alarm. If alarm persists, replace
power card
NO 5VA
ITVC failure
Reset alarm. If alarm persists, replace
ITVC
A
A