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Technical equipment of TC600 PLC
95
TXV 138 08.02
12. Removal of Faults
Within the guarantee period, repairs may be performed only by the pro-
ducer's employee or by a service organization determined on the basis of an
agreement.
PLC's of the TC600 series are complex electronic devices fitted with
parts for printed mounting and parts sensitive to the electrostatic charge.
Therefore the producer recommends to perform post-guarantee repairs only
by exchanging the whole units. For localization of the fault, the PLC's are
standard-fitted with the diagnostic system. Repairs of the units are per-
formed by the producer.
13. Maintenance
When general conditions for the installation are met, the PLC requires
minimum maintenance. Operations in which demounting of a part of the
PLC is necessary, are performed always with the PLC power supply, inputs
and outputs turned off.
13.1 Demounting of the PLC Parts
The BM cover is formed by the cover of the inputs and outputs board
and by the LED display cover. Cover of the inputs and outputs board can be
removed after unscrewing 4 fastening screw, the LED display cover can be
removed after unscrewing of 2 fastening screws.
EM and EM/2 covers (inputs and outputs boards) can be removed after
unscrewing of 4 fastening screws.
The inputs and outputs board can be taken out after unscrewing of 4
fastening screws. In the BM, the board is interconnected with freely de-
mountable insertion connection with the CPU board.
Optional piggybacks are placed on the BM CPU board. To make them
accessible, it is necessary to take out the mounting unit formed by the CPU
board, the shielding cover and the inputs and outputs board. After removal
of the BM covers and after unscrewing of 6 screws on the bottom side of the
BM trough, the unit can be taken out by its shifting to the right (the shielding
cover is inserted in 2 slots on the left side of the BM trough).
Parts sensitive to the electrostatic charge are used at the
PLC units. Follow principles for working with these circuits
in manipulation with the units.
13.2 Checking of PE Connectors Interconnection
Resistance between an arbitrary metal part of the PLC and the main
protective connector of the case in which the PLC is placed, is measured by
the meter of small resistances. Value of the resistance must be
0,1
13.3 Checking of the Power Supply
The PLC power supply is measured at connectors marked as M1 and
M2. The allowed voltage tolerance is 24 V~
±20 %, 24 V- ±20 %.
13.4 Checking of Voltage of Binary Inputs
Voltage of binary inputs is measured between the common connector of
the group (COM) and connectors of individual inputs (DI).
The allowed voltage tolerance for closing of the input is 15 V~
to 30 V~
or 16 V- to 30 V-. Allowed voltage tolerance for opening of the circuit is
0 V~
to 11 V~
or 0 V- to 12 V-.
Removal of the BM
and EM cover
Taking out of the
inputs and outputs
board
Making accessible of
BM optional
piggybacks