krom schroeder TC 1, Operating Instructions Manual

Page: 9 / 12

TC 1, TC 2, TC 3 · Edition 07.22
EN-9
? Fault
!
Cause
• Remedy
? Power LeD is permanently red.
!
There is over-/undervoltage. The TC performs a
safety shut-down.
• Check the mains voltage. As soon as there is
no longer over-/undervoltage, the TC returns
to normal operating mode and the Power LED
is green. It is not necessary to reset the device.
? operating signal LeD is permanently
yellow.
!
Safety interlock input signal is interrupted, no
voltage at terminal 5. The tightness test is still
being carried out. No enable signal is issued to
the automatic burner control unit.
• Check safety interlocks.
!
Fuse F2 defective.
• Replace F2, see page 9 (9.0.1 Replacing
the fuse).
? LeD flashes yellow.
!
Permanent remote reset. The remote reset signal
has been active for more than 10 s.
• The warning signal is cancelled once the
remote reset signal to terminal 11 has been
removed.
? operating signal LeD is permanently red.
!
Incorrect jumper/DIP switch setting.
• Correct jumper and DIP switch setting, see
page 6 (7 Setting the measurement time)
and page 6 (6 Setting the test instant).
Then press the reset button.
!
Internal error.
• Remove the unit and return it to the manufac-
turer for inspection.
? operating signal LeD flashes red.
!
Too frequent burner start commands. The TC
performs a fault lock-out. The start commands
are limited to 5 x in 15 minutes.
➔
As long as this limit is not exceeded, another start-
up attempt is possible after three further minutes.
If a tightness test is completed, the counter which
limits the number of start commands is reset.
• Then press the reset button.
!
Too many remote resets. More than 5 resets
have been conducted within the last 15 minutes,
either automatically or manually.
!
Consecutive fault caused by a previous fault
whose actual cause has not been remedied.
• Pay attention to previous fault messages.
• Remedy cause. Then press the reset button.
?
1
or
2
LeD is permanently red.
!
The valve is leaking. The TC performs a fault
lock-out.
• Replace the valve.
!
Wiring of the TC to the valves is faulty.
• Start the program and observe the interspace
pressure p
z
. The pressure must change during
the TEST phase. Check the wiring.
!
Inlet pressure p
u
< 10 mbar.
• Provide the min. inlet pressure of 10 mbar.
!
Interspace pressure p
z
cannot be reduced.
!
The volume downstream of the valve on the
burner side must be 5 times higher than the
volume between the valves and atmospheric
pressure must prevail.
!
The measurement time t
M
is too long.
!
Adjust t
M
, see page 6 (7 Setting the meas-
urement time).
? 1
and
2
LeDs are permanently red.
!
During the tightness test, the TC has determined
that inlet valve 1 and outlet valve 2 have been
reversed (fault lock-out).
• Check the wiring. Then press the reset button.
? no LeD lit even though mains voltage ap-
plied.
!
Fuse F1 defective.
• Replace F1, see page 9 (9.0.1 Replacing
the fuse).
9.0.1 Replacing the fuse
➔
The fuses F1 and F2 can be removed for inspection.
➔
Insert a screwdriver into the opening in the contact
guard to prise out the fuse.
1
Disconnect the TC from the electrical power sup-
ply.
➔
Before opening the unit, the fitter should ground
himself.
2
Unscrew the housing cover.
3
Remove fuse F1 or F2.
4
Check function of fuse.
5
Replace the fuse if defective.
➔
When replacing the fuse, use only the approved
fuse type, see page 10 (11.3 Electrical data).
➔
Restart the TC, see page 8 (8 Commissioning).