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Overpressure alarm (related function codes -> J11, J12 and J13)
Target: make the inverter enter a STOP state and display an error code, when the process value
(Feedback – pressure transducer) rises above a predefined level.
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Digital Input to use: X4 (with “Enable External alarm Trip” command assigned to it)
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Digital Output to use: Y2 (with “PID Alarm” signal assigned to it)
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Wiring:
- Connect X4 to Y2
- Connect CMY to PLC (*)
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Set-up:
E04 (X4) = 1009: Enable External Alarm Trip (THR)
E21 (Y2) = 42: PID Alarm (PID-ALM)
J12 = PID Control. Upper Limit Alarm (AH) (%)
J13 = PID Control. Lower Limit Alarm (AL) (%)
Error Message: when the process value (Feedback – Pressure transducer) is above the value set in J12
(upper limit) or below the value set in J13 (lower limit), the inverter’s output is switched off and the inverter
will display OH2 error code. This error can be reset by means of the keypad or by means of a digital input
(8: “Reset Alarm” (RST)).
(*) Assuming that the logic of the digital inputs is Active-High Logic (the common of the inputs is PLC
(+24VDC) and inputs’ logic switch is in SOURCE).
If the common of the inputs is terminal CM (0 VDC) (Active-Low Logic in the inputs), please connect the
terminals CMY and CM and set the switch to the SINK position.
Note: In order to select other alarm modes, please see description of function code J11 (PID Control.
Select Alarm Output) in the User Manual of the
inverter.
Figure 3.1: Pump Control Schematic for overpressure alarm
Pump Control Quick Guide
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