Basler Electric BE1-50/51B-237 - Manual (Page 36)

4-4 BE1-50/51B-237/-238 Installation 9252000899 Rev B
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 4-3:
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 4-3. Coordination Timing Diagram
Maintenance
BE1-50/51B-237 and BE1-50/51B-238 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.