21
When used under the conditions specified in
chapter "Technical data", the relay requires
practically no maintenance. The relay includes
no parts or components that are sensitive to
abnormal physical or electrical wear under nor-
mal operating conditions.
If the environmental conditions on site differ
from those specified, as to temperature and
humidity, or if the atmosphere around the relay
contains chemically active gases or dust, the
relay should be visually inspected during the
relay secondary testing. The visual inspection
should focus on:
- Signs of mechanical damage on relay case and
terminals
- Dust accumulated inside the relay cover or
case; remove carefully with compressed air or
a soft brush
- Signs of corrosion on terminals, case or com-
ponents inside the relay
If the relay fails in operation or if the operation
values considerably differ from those stated in
the relay specifications, the relay should be given
a proper overhaul. Minor measures, such as
exchange of a faulty module, can be taken by
personnel from the customer’s instrument work-
shop, but major measures involving the elec-
tronics are to be taken by the manufacturer.
Please contact the manufacturer or his nearest
representative for further information about
checking, overhaul and calibration of the relay.
Note!
The protection relays contain electronic circuits
which are liable to serious damage due to elec-
trostatic discharge. Before removing a module,
ensure that you are at the same electrostatic
potential as the equipment by touching the case.
Note!
Static protection relays are measuring instru-
ments and should be handled with care and
protected against damp and mechanical stress,
especially during transport and storage.
Maintenance
and repair
Overvoltage and undervoltage relay module SPCU 3C14
Combined power supply and I/O module
- U
aux
= 80...265 V ac/dc SPTU 240S1
- U
aux
= 18...80 V dc SPTU 48S1
Case (including I/O module) SPTK 3E15
I/O module SPTE 3E15
Bus connection module SPA-ZC 17_ or SPA-ZC 21_
Exchange and
spare parts
Ordering
numbers
Combined overvoltage and undervoltage relay
SPAU 130 C RS 422 020 -AA, CA, DA, FA
Combined overvoltage and undervoltage relay including test adapter RTXP 18
SPAU 130 C RS 422 220 -AA, CA, DA, FA
The two last letters of the ordering number designate the rated frequency f
n
and
the U
aux
voltage range of the relay as follows:
AA: f
n
= 50 Hz and U
aux
= 80...265 V ac/dc
CA: f
n
= 50 Hz and U
aux
= 18...80 V dc
DA: f
n
= 60 Hz and U
aux
= 80...265 V ac/dc
FA: f
n
= 60 Hz and U
aux
= 18...80 V dc