7.23
Date Code 20080213 Instruction Manual SEL-351A Relay
Inputs, Outputs, Timers, and Other Control Logic
Multiple Setting Groups
Figure 7.21 Rotating Selector Switch Connected to Inputs IN101, IN102, and
IN103 for Active Setting Group Switching
The selector switch has multiple internal contacts arranged to assert inputs
IN101, IN102, and IN103, dependent on the switch position. As shown in
Table 7.7, when the selector switch is moved from one position to another, a
different setting group is activated. The logic in Table 7 .6 is implemented in
the SEL
OGIC control equation settings in Table 7.7.
The settings in Table 7.7 are made in each setting Group 1 through 6.
Selector Switch Starts Out in Position 3
Refer to Ta ble 7.7 and Figure 7.22.
If the selector switch is in position 3 in Figure 7.21, setting Group 3 is the
active setting group (Relay Word bit SG3 = logical 1). Inputs IN101 and IN102
are energized and IN103 is de-energized:
SS3 = !IN103 * IN102 * IN101 = NOT(IN103) * IN102 * IN101
= NOT(logical 0) * logical 1 * logical 1 = logical 1
To get from the position 3 to position 5 on the selector switch, the switch
passes through the position 4. The switch is only briefly in position 4:
SS4 = IN103 * !IN102 * !IN101 = IN103 * NOT(IN102) * NOT(IN101)
= logical 1 * NOT(logical 0) * NOT(logical 0) = logical 1
Ta b le 7 . 7 SEL OGIC Control Equation Settings for Rotating Selector Switch
Active Setting Group Switching
Setting Explanation
SS1 = !IN103 * !IN102 * IN101 = NOT(IN103) * NOT(IN102) * IN101
SS2 = !IN103 * IN102 * !IN101 = NOT(IN103) * IN102 * NOT(IN101)
SS3 = !IN103 * IN102 * IN101 = NOT(IN103) * IN102 * IN101
SS4 = IN103 * !IN102 * !IN101 = IN103 * NOT(IN102) * NOT(IN101)
SS5 = IN103 * !IN102 * IN101 = IN103 * NOT(IN102) * IN101
SS6 = IN103 * IN102 * !IN101 = IN103 * IN102 * NOT(IN101)
SEL-351
IN102
(–)
IN101 IN103
Remote
1
2
3
4
5
6
(+)
Courtesy of NationalSwitchgear.com
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