22
Maintenance
and repair
When used under the conditions specified in
the section "Technical data", the relay requires
practically no maintenance. The relay includes
no parts or components that are liable to abnor-
mal physical or electrical wear under normal
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 to 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 undertaken
by personnel from the customer’s instrument
work-shop, but major measures involving meas-
ures in the electronic circuitry are to be taken by
the manufacturer. Please contact the manufac-
turer or his nearest representative for further
information about checking, overhaul and
recalibration of the relay.
Note!
The protection relays contain electronic circuits
which are liable to serious damage due to elec-
trostatic discharge. Before withdrawing a mod-
ule from the relay case, 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.
Spare parts
Three-phase overcurrent relay module
SPCJ 3C3
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 3E4
I/O module
SPTE 3E4
Bus connection module
SPA-ZC 17_ or SPA-ZC 21_
Ordering
numbers
Overcurrent relay without test adapter
SPAJ 131 C
RS 421 013 -AA, CA, DA, FA
Overcurrent relay with test adapter RTXP 18
SPAJ 131 C
RS 421 213 -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
