gefran 2400 Installation And Operation Manual Download Page 42

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80290C_MHW_2400_0908_ENG

6 • MAINTENANCE

This section gives the information and the necessary
warnings for routine maintenance of the instrument
2400 and contains a Troubleshooting Guide which
should be read before seeking help from the Gefran
Customer Service Assistance, in the event of instru-
ment 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 instrument 2400 will
work normally without any need for maintenance, apart from
the usual operations of cleaning the faceplate, and if neces-
sary 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 instrument 2400 is not equip-
ped with an ON/OFF switch.

Cleaning
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.

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
CPU Board
The component side of the CPU board contains the jumper
S9 which enables (if on) access to the instrument menus.

POWER Board
Jumpers J1, J2, J3, J4 for selection of contact type no/nc for
the relay outputs are present on the component side of the
POWER board.

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.

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 not
all of the parameters and/or
configuration menus can be
accessed
Instead of the process variable
the PV display shows one of
the following:

SBR

ERr

Ebr

Ebr.Lo

Er.rtd

Instrument 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:

2400 – x – x – x – x – 1 = 100..240Vac/dc
2400 – x – x – x – x – 0 = 20..27Vac/dc

Possible fault with one of the display segments. Check that all the segments are working pro-
perly by switching the instrument 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

88888

). 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 instrument
hardware configuration does not give the option of editing the preset parameters, apart from
the setpoint value or the alarm point, at level 1 to display.
(For modified of parameters jumper S9 on the CPU board).
Access to some menus and/or parameters is controlled by a password (

PAS

) and by a

protection code (

PRO

) which disables the modalità configuration 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).

Err

, means that in case of Pt100 probe, the input is in short circuit. In case of TC in short cir-

cuit, the PV display shows room temperature instead of the process variable.
In case of input 4...20mA, it indicates that the transmitter is broken or not powered.

Ebr

means strain-gauge probe broken or not powered.

Ebr.Lo

no power to probe

Er.rtd

third wire of PT100 probe broken or not connected

Symptom

Cause and Recommended remedy

Troubleshooting Guide

J1A

J2A

J3A