ABB SPAU 331 C, User Manual And Technical Description

16

Maintenance
and repair

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

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.

Spare parts

Residual overvoltage relay module

SPCU 1C6

Two-stage undervoltage relay module

SPCU 3C15

Power supply modules
- U

aux

 = 80...265 V ac/dc (operative range)

SPGU 240 A1

- U

aux

 = 18...80 V dc (operative range)

SPGU 48 B2

Output relay module

SPTR 6B3

Interface module

SPTE 4B9

Case (including connection module)

SPTK 4B9

Bus connection module

SPA-ZC 17_ or SPA-ZC 21_

Delivery
alternatives

Type

Equipment

SPCU SPCU

1C6

3C15

SPAU 331 C1

Basic version, residual voltage and undervoltage module

x

x

SPAU 331 C3

Basic version, residual voltage module alone

x

SPAU 331 C5

Basic version, undervoltage module alone

x

Delivery versions of the voltage relay SPAU 331 C.