Date Code 20010719 701 Motor Protection Relay
Settings Calculation
Basic Motor Protection
4.29
Speed Switch Tripping
Table 4.21 Spee d Switch Trippi ng Time Delay S etting
When the motor is equipped with a speed switch, you may wish to provide
additional locked rotor protection using the relay speed switch input. When the Speed
Switch Trip Time Delay is set, the relay will trip if the speed switch is not closed
SPDSDLY seconds after the motor start begins. If you wish to use speed switch
tripping, connect the speed switch contacts to relay input IN3 or to the contact input at
the SEL-2600 RTD Module. The contact input on the SEL-2600 RTD Module is the
Relay Word bit IN7.
NOTE: The SEL-2600 RTD Module updates the state of the RTD
measurements and contact input every 0.5 seconds. To
account for this update delay, you may wish to set a slightly
longer Speed Switch Trip Time Delay when the speed switch
contact is monitored by the external module.
To disable speed switch tripping, set the Speed Switch Trip Time Delay
equal to OFF.
Table 4.21 Speed Switch Tripping Time Delay Setting
Setting Prompt
Setting Range
Setting Name =
Factory Default
Speed Switch Trip Time Delay OFF, 0.50–400.00 s SPDSDLY = OFF
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