Repairs, Storage
7SV512
V1
111
C53000---G1176---C91
8
Repairs
Repair of defective modules is not recommended at
all because specially selected electronic compo-
nents are used which must be handled in accor-
dance with the procedures required for
E
lectrostati-
cally
E
ndangered
C
omponents (EEC). Further-
more, special manufacturing techniques are neces-
sary for any work on the printed circuit boards in or-
der to do not damage the bath-soldered multilayer
boards, the sensitive components and the protec-
tive finish.
Therefore, if a defect cannot be corrected by opera-
tor procedures such as described in Chapter 7, it is
recommended that the complete relay should be re-
turned to the manufacturer. Use the original packag-
ing for return. If alternative packing is used, this must
provide the degree of protection against mechanical
shock, as laid down in IEC 60255---21---1 class 2 and
IEC 60255---21---2 class 1.
If it is unavoidable to replace individual modules, it is
imperative that the standards related to the handling
of
E
lectrostatically
E
ndangered
C
omponents are
observed.
Hazardous voltages can be present in the
device even after disconnection of the sup-
ply voltage or after removal of the module
from the housing (storage capacitors)!
!
Warning
Electrostatic discharges via the component
connections, the PCB tracks or the con-
necting pins of the modules must be
avoided under all circumstances by pre-
viously touching an earthed metal surface.
This applies equally for the replacement of
removable components, such as EPROM
or EEPROM chips. For transport and re-
turning of individual modules electrostatic
protective packing material must be used.
!
Caution!
Components and modules are not endangered as
long as they are installed within the relay.
Should it become necessary to exchange any de-
vice or module, the complete parameter assignment
should be repeated. Respective notes are contained
in Chapter 5 and 6.
9
Storage
Solid state protective relays shall be stored in dry
and clean rooms. The limit temperature range for
storage of the relays or associated spare parts is
---25
_
C to +55
_
C (refer Section 3.1.4 under the
Technical data), corresponding to ---12
_
F to 130
_
F.
The relative humidity must be within limits such that
neither condensation nor ice forms.
It is recommended to reduce the storage tempera-
ture to the range +10 C to +35 C (50 F to 95 F);
this prevents from early ageing of the electrolytic ca-
pacitors which are contained in the power supply.
For very long storage periods, it is recommended
that the relay should be connected to the auxiliary
voltage source for one or two days every other year,
in order to regenerate the electrolytic capacitors.
The same is valid before the relay is finally installed.
In extreme climatic conditions (tropics) pre-warming
would thus be achieved and condensation avoided.
Before initial energization with supply voltage, the
relay shall be situated in the operating area for at
least two hours in order to ensure temperature
equalization and to avoid humidity influences and
condensation.
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