Schneider Electric altivar 58 telemecanique, vw3-a58101 manual Analog input application functions

GP_ATV58_EN.fm Page 97 Mardi, 2. avril 2002 9:24 21

Configurable I/O Application Functions

Analog input application functions

Input AI1 is always the speed reference.

Assignment of AI2 and AI3

Summing speed reference : The frequency setpoints given by AI2 and AI3 can be summed with AI1.

Speed regulation with tachogenerator : (Assignment on AI3 only with an I/O extension card with analog input)

An external divider bridge is required to adapt the voltage of the tachogenerator. The maximum voltage must be between 5 and 9 V. A precise setting is then obtained by setting the dtS parameter available in the adjust menu.

PTC probe processing : (only with an I/O extension card with analog input). Used for the direct thermal protection of the motor by connecting the PTC probes in the motor windings to analog input AI3.

PTC probe characteristics :

Total resistance of the probe circuit at 20 °C = 750 W.

PI regulator: Used to regulate a process with a reference and a feedback given by a sensor. In PI mode the

ramps are all linear, even if they are configured differently.

With the PI regulator, it is possible to:

- Adapt the feedback via FbS.

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Correct PI inversion.

- Adjust the proportional and integral gain (RPG and RIG).

- Assign an analog output for the PI reference, PI feedback and PI error.

- Apply a ramp to establish the action of the PI (AC2) on start-up if PSP > 0.

If PSP = 0 the active ramps are ACC/dEC. The dEC ramp is always used when stopping.

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The motor speed is limited to between LSP and HSP.

Note: PI regulator mode is active if an AI input is assigned to PI feedback. This AI assignment

can only be

made after disabling any functions incompatible with PI (voir page 92).

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Auto/Man: This function can only be accessed when the PI function is active, and requires an I/O extension card with analog input

Via logic input LI, this is used to switch operation to speed regulation if LIx = 0 (manual reference on AI3), and PI regulation if LIx = 1 (auto).

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