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This section gives the information and the necessa-
ry warnings for routine maintenance of the
1200/1300 controllers and contains a
Troubleshooting Guide which should be read before
seeking help from the Gefran Customer Service
Assistance, in the event of instrument malfunction.
If installed and configured correctly according to the
instructions and the recommendations provided in Sections 2
and 4 of these Instructions for use, the 1200/1300 Controller
will work normally without any need for maintenance, apart
from the usual operations of cleaning the faceplate, and if
necessary the internal parts of the instrument.
To gain access to the inside of the instrument
(for example for cleaning or to check the jum-
pers) just undo the screw at the bottom of the
faceplate and take out the instrument without
having to disconnect the cables.
Make sure that the power is turned off upstream
of the instrument however.
Remember that the 1200/1300 Controller is not
equipped with an ON/OFF switch.
Cleaning the Controller
To clean the faceplate and the case use only a
cloth dampened in water or ethyl alcohol.
Do not use hydrocarbon-based solvents
(trichiorethylene, petrol, etc.).
Do not use compressed air to remove dust from
the electronic circuit boards, if necessary use a
clean brush with soft bristles.
Symptom
The Controller display and Led
do not come on
The characters shown on the
display are incomplete or
illegible
When pressing down
of the configuration menus can
be accessed
When pressing down
all of the parameters and/or
configuration menus can be
accessed
Instead of the process variable
the PV display shows one of
the following:
LO - KI - SBR - ER
Low numerical value
(e.g. 22)
81801G_MHW_1200-1300_07-2011_ENG
6 • MAINTENANCE
Cause and Recommended remedy
Controller power supply problem. Check that power is being supplied to terminals 10-11.
make sure the power supply corresponds with the one stated in the order code:
Possible fault with one of the display segments. Check that all the segments are working
properly by switching the controller off and then on again. When it is switched on again a self-
diagnostic test is performed that checks intermittent start up of all the segments (displays the
value 8888). If one or more segments do not light up contact your Gefran dealer.
none
If the problem occurs in the initial installation phase, it probably means that the Controller har-
dware configuration does not give the option of editing the preset parameters, apart from the
setpoint value and the AL1 alarm point. (Parameter editing is enabled by the jumper S4 on
the CPU board. If on the other hand the problem occurs on a Controller that previously gave
access to the configuration parameters, this probably means that there is a false contact on
the jumper S4. In this case check the continuity of the jumper referring to the previous
paragraph.
not
Access to some menus and/or parameters is controlled by a password (PAS) and by a
protection code (PRO) which disables the extended configuration mode, allowing configuration
only in the "Easy" (Limited) mode.
To set the password and the protection code correctly refer to Section 4 "Configuration/
Programming".
In the first four cases it means that an input error has been found (for details refer to Section
3 - Functions)
In the last case, it means that the input probe has short-circuited. In this condition the PV
display PV shows the room temperature instead of the process variable.
Troubleshooting Guide
Repairs
Repairs to the Controller must only be carried
out by qualified technicians, properly trained and
authorized by Gefran. Any attempts at repair or
modification of the Controller hardware characte-
ristics by unauthorized personnel will invalidate
the warrantya.
Checking the jumpers
On the component side of the CPU there are two jumpers: S2
(PT100), S3 (+VT).
Use of these jumpers is reserved Gefran Service Technicians.
The solders side of the CPU board instead contains the
jumper S4 which enables (if on) access to the controller
menus.
Solders side
The controller contains components which are
sensitive to electrostatic discharge, so the rele-
vant precautions must be taken when handling
the electronic circuit boards contained in it, in
order to avoid permanent damage to components
themselves.
1200/1300 – xx – xx – xx – x – 1 = 100..240Vac/dc
1200/1300 – xx – xx – xx – x – 0 = 11..27Vac/dc
S4
35
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