Maintenance; Cleaning The Controller; Repairs; Checking The Jumpers - gefran 1200 Bedienungsanleitung

This section gives the information and the necessary
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 jumpers)
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.

Troubleshooting Guide

Symptom
The Controller display and Led
do not come on
The characters shown on the
display are incomplete or
illegible
When pressing down none
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)
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 pro-
perly by switching the controller off and then on again. When it is switched on again a self-dia-
gnostic 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.
If the problem occurs in the initial installation phase, it probably means that the Controller
hardware 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 dis-
play PV shows the room temperature instead of the process variable.

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
characteristics 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
relevant 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
76
S4