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Maintenance
and repair
Spare parts
Delivery
alternatives
16
When the voltage relay SPAU 331 C is operat-
ing under the conditions specified in "Techni-
cal data", the relay requires practically no main-
tenance. The voltage relay includes no parts or
components that are sensitive to physical or elec-
trical wear under normal operating conditions.
Should the temperature and humidity at the
operating site differ from the values specified,
or the atmosphere contain chemically active
gases or dust, the relay should be visually in-
spected in association with the secondary test-
ing of the relay. This visual inspection should
focus on:
- Signs of mechanical damage to relay case and
terminals
- Collection of dust inside the relay case; remove
with compressed air
- Signs of corrosion on terminals, case or inside
the relay
Residual overvoltage relay module
Two-stage undervoltage relay module
Power supply modules
- U
= 80...265 V ac/dc (operative range)
aux
- U
= 18...80 V dc (operative range)
aux
Output relay module
Interface module
Case (including connection module)
Bus connection module
Type
Equipment
SPAU 331 C1
Basic version, residual voltage and undervoltage module
SPAU 331 C3
Basic version, residual voltage module alone
SPAU 331 C5
Basic version, undervoltage module alone
Delivery versions of the voltage relay SPAU 331 C.
If the relay malfunctions or the operating val-
ues differ from those specified, the relay should
be overhauled. Minor measures can be taken by
the customer but any major repair involving the
electronics has to be carried out by the manu-
facturer. Please contact the manufacturer or his
nearest representative for further information
about checking, overhaul and recalibration of
the relay.
The protection relay contains circuits sensitive
to electrostatic discharge. If you have to with-
draw a relay module, ensure that you are at the
same potential as the module, for instance, by
touching the case.
Note!
Protective relays are measuring instruments and
should be handled with care and protected
against moisture and mechanical stress, espe-
cially during transport.
SPCU 1C6
SPCU 3C15
SPGU 240 A1
SPGU 48 B2
SPTR 6B3
SPTE 4B9
SPTK 4B9
SPA-ZC 17_ or SPA-ZC 21_
SPCU SPCU
1C6
3C15
x
x
x
x
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