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Figure 196: How Overload Affects Time To Overload
The screenshot above illustrates how the overload bucket drains off slowly when the current drops below
overload. In this simulation the motor is started at 125% of the overload threshold. The system detects
overload in 2 minutes and stops. The system restarts 2 minutes later with load still at 125%. The system
shuts down almost immediately (as the heat in the motor has not had time to dissipate). The system
is restarted a second time 2 minutes later with loading at 100% of overload. As you can see, at 100%
overload the motor temperature is stable.
10 Trigger Definition
10.1 Trigger Definition
Triggers are used to define events or conditions in the pumping system and to take actions that affect the
state of the motor controller (MC). When the condition is met, the trigger is said to be
SET . If the condition is
not met, the trigger is said to be CLEAR . For example, a High Limit trigger tests the value of a channel
against a limit. If the limit is exceeded the trigger is SET and the system state is affected by the ACTION
defined for the particular trigger.
Examples of Triggers:
• Tank Level High Trigger-Starts motor if a tank level exceeds the trigger limit (sometimes referred to as
setpoint or threshold).