4.45
Date Code 20080918 Instruction Manual SEL-749M Relay
Protection and Logic Functions
Logic Functions
Start Report Setting
The setting MSRR defines resolution of the motor start report; refer to
Section 5: Metering and Monitoring for additional information.
Logic Functions
This subsection explains the settings and operation of the logic input/output of
the SEL-749M, including the following:
➤ Optoisolated Inputs
➤ Remote Control Switches
➤ Latch Control Switches
➤ SELOGIC Control Equation Variables/Timers
➤ Output Contacts
Introduction
Table 4.51 describes all of the logic input/output of the SEL-749M.
Optoisolated Inputs
Figure 4.25 and Figure 4.26 show the resultant Relay Word bits that follow
corresponding optoisolated inputs for the different SEL-749M models. Inputs
IN301–IN308 operate similarly and the resultant Relay Word bits are IN301–
IN308.
The figures show examples of energized and de-energized optoisolated inputs
and corresponding Relay Word bit states. To assert an input, apply rated
control voltage to the appropriate terminal pair (see Figure 2.4 and
Figure 2.6).
Figure 4.25 is used for the following discussion/examples. The optoisolated
inputs in Figure 4.26 operate similarly.
Table 4.50 Motor Start Report Setting
Setting Prompt Setting Range Setting Name := Factory Default
MSR RESOLUTION 0.25, 0.5, 1, 2, 5 cyc MSRR := 5
Table 4.51 SEL-749M Logic Inputs and Outputs
Description Setting
Optoisolated inputs IN101–IN102
Optoisolated inputs (Optional) IN401–IN403
Optoisolated inputs (Optional) IN301–IN308
Remote control switches Remote bits RB1–RB8
Latch control switches Latch bits LT01–LT08
SEL
OGIC control equations variables/timers SV01/SV01T–SV08/SV08T
Output contacts OUT101–OUT103
Output contacts (Optional) OUT401–OUT404
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
