Basler Electric BE1-50/51B-230 - Manual (Page 40)

4-8 BE1-50/51B-230/-234/-239 Installation 9252000894 Rev H
From the reset characteristic curve equation:
1
2
−
=
M
RD
T
R
M equals 0 if current goes to zero. A negative result indicates reset time.
seconds 15.5
1 0
2 7.75
2
− =
−
×
=
Result: Full trip = 0.209 seconds and full reset = 15.5 seconds if current goes to zero.
In Figure 4-7:
T
A
= 0.209 seconds (relay was at reset)
T
B
= value<T
A
because rewind has not gone to zero
T
C
= value<T
A
because rewind has not gone to zero
Figure 4-7. Coordination Timing Diagram
Maintenance
BE1-50/51B-230, BE1-50/51B-234, and BE1-50/51B-239 relays require no preventative maintenance
other than periodic checking of relay connections to make sure that they are clean and tight. If the relay
fails to function properly, contact the Technical Sales Support department of Basler Electric.
Storage
This device contains long-life aluminum electrolytic capacitors. For devices that are not in service (spares
in storage), the life of these capacitors can be maximized by energizing the device for 30 minutes once
per year.