Basler BE1-50/51B-217, Instruction Manual, Page: 47 / 49

6-1
CAUTION
Substitution of printed circuit boards or individual components does not necessarily
mean the relay will operate properly. Always test the relay before placing it in
operation.
SECTION 6
MAINTENANCE
GENERAL
BE1-50/51B-217 Overcurrent Relays require no preventive maintenance. However, periodic checks
should be performed according to scheduled practices. A recommended periodic test is provided in this
section. If the relay fails to function properly and if factory repair is desired, contact the Customer
Service Department of the Power Systems Group, Basler Electric, for a return authorization number prior
to shipping.
IN-HOUSE REPAIR
In-house replacement of individual components should be performed by qualified technicians.
If in-house repair is to be attempted, the quality of replacement parts must be at least equal to that of the
original components.
Where special components are involved, Basler Electric part numbers may be obtained from the number
stamped on the component or assembly, the schematic, or parts list. These parts may be ordered
directly from Basler Electric. When complete boards or assemblies are needed, the following
information is required.
1. Relay model number
2. Relay serial number
STORAGE
This protective relay contains long life aluminum electrolytic capacitors. Life in excess of 20 years may
be expected if the storage temperature does not exceed 40
C (72 F).
PERIODIC TESTS
General
All relays should be tested periodically to identify and correct any problems that are found.
Single phase relays such as the BE1-50/51B-217 are normally used in groups of four (three phase and
ground) on the protected circuit. Only three are required at any one time to provide complete protection.
The fourth one assures that protection is maintained even if one relay failed.