CANplus CP750-E
Control Panel Operation Manual
*Patent Pending
25
9M02-1000-A501-EN
Revision B
The following table describes the Start/Stop events when behavior operation is set to “High to Low”
(switches/floats are normally open):
Start/Stop Events
Engine Starts When
Engine Stops When
Single Switch
SW1 is closed
SW1 is open
Dual Switch
SW1 and SW2 are both closed
SW1 and SW2 are both open
Transducer
Input is above high set point
Input is below low set point
Transducer with Backup
Switches
Input is above high set point; Dual
Switch mode if Transducer fault is
detected
Input is below low set point; Dual
Switch mode if Transducer fault is
detected
Scheduler
Date and Time occurs
Date and Time occurs
Timed Run
Autostart switch pressed
Timer expires
The following table describes the Start/Stop events when behavior operation is set to “Low to High”
(switches/floats are normally open):
Start/Stop Events
Engine Starts When
Engine Stops When
Single Switch
SW1 is open
SW1 is closed
Dual Switch
SW1 and SW2 are both open
SW1 and SW2 are both closed
Transducer
Input is below low set point
Input is above high set point
Transducer with Backup
Switches
Input is below low set point; Dual
Switch mode if Transducer fault is
detected
Input is above high set point; Dual
Switch mode if Transducer fault is
detected
Scheduler
Date and Time occurs
Date and Time occurs
Timed Run
Autostart switch pressed
Timer expires
Transducer Fault Detection using Backup Switches
When configured and equipped with transducer and back up switches, the panel will use the transducer to
determine the primary start and stop events. The switches are used to detect transducer faults; when a fault is
detected, the panel will automatically adjust to use the switches to detect the start and stop events. The panel
will alert to the fault, but normal operation will continue with the exception that the switches will be used instead
of the faulty transducer.
For proper operation and fault detection, the switches must be configured such that the high-switch opens/closes
at a level above the transducer’s high-level point and the low-switch opens/closes at a level below the
transducer’s low-level point, as illustrated in the fluid pumping example diagram below.
As an example, consider the following situation. When pumping fluid, the setup should be like the following
diagram. Typically, floats function as an Open switch when not floating and a Closed switch when floating.
