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.
!"#$%&'()
MAINTENANCE
GENERAL
BE1-51/27C Time Overcurrent Relays require no preventive maintenance other than a periodic operational
test (refer to Section 5 for operational test procedure). If the relay fails to function properly, and in-house
repair is contemplated, consult the Service Manual (publication number 9 1372 00 620). 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 may be difficult and should not be attempted unless
appropriate equipment and qualified personnel are available.
If in-house repair is to be attempted, component values may be obtained from the schematics or the parts
list of the Service Manual. Replacement parts may be purchased locally. 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 and style number
2. Relay serial number
3. Board or assembly
a) Part number
b) Serial number
c) Revision letter
4. The name of the board or assembly.
STORAGE
This protective relay contains aluminum electrolytic capacitors which generally have a life expectancy in
excess of 10 years at storage temperatures less than 40
!
C. Typically, the life expectancy of the capacitor
is cut in half for every 10
!
C rise in temperature. Storage life can be extended if, at one-year intervals, power
is applied to the relay for a period of thirty minutes.
Summary of Contents for BE-51/27C
Page 1: ...0 1 2 3 4 5 67869 ABC DEF G 6H II GGJ KL M DEF DEK...
Page 16: ...BE1 51 27C Controls and Indicators 2 2 Figure 2 1 Location of Controls and Indicators...
Page 20: ...BE1 51 27C Controls and Indicators 2 6...
Page 22: ...BE1 51 27C Functional Description 3 2 Figure 3 2 Functional Block Diagram...
Page 32: ...BE1 51 27C Installation 4 7 Figure 4 10 Typical Internal Diagram Sensing Input Type L...