6.4
SEL-351A Relay Instruction Manual Date Code 20080213
Close and Reclose Logic
Close Logic
Unlatch Close
SELOGIC control equation setting ULCL is set with the TRIP Relay Word bit.
This prevents the CLOSE Relay Word bit from being asserted any time the
TRIP Relay Word bit is asserted (TRIP takes priority). See Trip Logic on
page 5.1.
SEL
OGIC control equation setting 52A is set with optoisolated input IN101.
Input IN101 is connected to a 52a circuit breaker auxiliary contact. When a
closed circuit breaker condition is detected, the CLOSE Relay Word bit is
deasserted to logical 0. Setting 52A can handle a 52a or 52b circuit breaker
auxiliary contact connected to an optoisolated input (see Optoisolated Inputs
on page 7.2 for more 52A setting examples).
With setting CFD = 60.00 cycles, once the CLOSE Relay Word bit asserts, it
remains asserted at logical 1 no longer than a maximum of 60 cycles. If the
Close Failure Timer times out, Relay Word bit CF asserts to logical 1, forcing
the CLOSE Relay Word bit to logical 0.
Defeat the Close
Logic
If SELOGIC control equation circuit breaker auxiliary setting 52A is set with
numeral 0 (52A = 0), then the close logic is inoperable. Also, the reclosing
relay is defeated (see Reclosing Relay on page 6.12).
Circuit Breaker
Status
Refer to the bottom of Figure 6.1. Note that SELOGIC control equation setting
52A (circuit breaker status) is available as Relay Word bit 52A. This makes
for convenience in setting other SEL
OGIC control equations. For example, if
the following setting is made:
52A = IN101 (52a auxiliary contact wired to input IN101)
or
52A = !IN101 (52b auxiliary contact wired to input IN101)
then if breaker status is used in other SEL
OGIC control equations, it can be
entered as 52A. The user does not have to enter IN101 (for a 52a) or !IN101
(for a 52b). For example, refer to Rotating Default Display (Only on Models
With LCD) on page 7.34. In the factory settings, circuit breaker status
indication is controlled by display point setting DP2:
DP2 = IN101
This can be entered instead as:
DP2 = 52A
(presuming SEL
OGIC control equation setting 52A = IN101 is made).
Program an Output
Contact for Closing
In the factory settings, the resultant of the close logic in Figure 6.1 is routed to
output contact OUT102 with the following SEL
OGIC control equation:
OUT102 = CLOSE
See Output Contacts on page 7.31 for more information on programming
output contacts.
NOTE: Display Point settings are
available only on models with LCD.
Courtesy of NationalSwitchgear.com
To Next Page
Loading...