Schweitzer Engineering SEL-351P, Quick Start Manual

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Date Code 990215 Inputs, Outputs, Timers, and Other Control Logic 7-21
SEL-351P Manual Técnico
SEL-351P Disabled Momentarily During Active Setting Group Change
The SEL-351P is disabled for a few seconds while the it is in the process of changing active
setting groups. SEL-351P elements, timers, and logic are reset, unless indicated otherwise in
specific logic description [e.g., local bit (LB1 through LB8) and latch bit (LT1 through LT8)
states are retained during a active setting group change]. The output contacts go to their
deenergized state during an active setting group change, regardless of their corresponding
SEL
OGIC
Control Equation settings. See Figure SECTION 7: .26 for examples of output
contacts in the deenergized state (i.e., corresponding output contact coils deenergized).
Active Setting Group Switching Example 1
Use a single optoisolated input to switch between two setting groups in the SEL-351P. In this
example, optoisolated input IN105 on the relay is connected to a SCADA contact in
Figure SECTION 7: .18. Each pulse of the SCADA contact changes the active setting group
from one setting group (e.g., setting Group 1) to another (e.g., setting Group 4). The SCADA
contact is not maintained, just pulsed to switch from one active setting group to another.
Figure SECTION 7: .18: SCADA Contact Pulses Input IN105 to Switch Active Setting
Group Between Setting Groups 1 and 4
If setting Group 1 is the active setting group and the SCADA contact is pulsed, setting Group 4
becomes the active setting group. If the SCADA contact is pulsed again, setting Group 1
becomes the active setting group again. The setting group control operates in a cyclical manner:
pulse to activate setting Group 4 ... pulse to activate setting Group 1 ... pulse to activate
setting Group 4 ... pulse to activate setting Group 1 ...
This logic is implemented in the SEL
OGIC
Control Equation settings in Table SECTION 7: .5.