Schneider Electric 58 TRX manual Reference Switching Timing and Wiring Diagrams, Forced Local

Altivar® 58 TRX AC Drives

Assignment of Logic Inputs (LIx)

	f (Hz)	RefSwitch.eps
AI1
AI2
		t
Forward	1
or	0	t
Reverse
	1
LIx 0		t

Connection Diagram for Reference Switching
LIx	COM	AI1	+10	AI2
	–	+		0-20 mA
				4-20 mA
				20-4 mA
+ 24 V		Remote
		Signal

Reference Switching Timing and Wiring Diagrams

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Forced Local

This function allows a logic input to be assigned to force local control of the drive controller. Configuration of this function is recommended when using serial communication with the drive controller. This input is typically wired into the Hand and Off positions of a Hand-Off-Auto selector switch when used in conjunction with serial communication with the drive controller. Assigning this parameter provides terminal block control when the logic input is closed (state 1). Initiating this input overrides any commands being received over the serial communications link and the drive controller responds to the inputs given at the control terminal block. Parameter data can still be monitored over the serial communication link.

Fault Reset

This function allows faults to be reset by a logic input assigned to this function. Two types of reset are available. See page 66 for fault reset types.

External Fault

This function allows a logic input to be assigned to receive an external contact closure to stop the drive controller and motor. The drive controller will stop according to the controlled stop configuration. This function is useful in applications where interlocking of various equipment and the drive controller is required.

Reference Switching (Auto – Manual)

The Reference switching function permits switching between two analog references by logic command. This function avoids switching of low-level speed reference signals by other means, and enables the two reference inputs AI1 and AI2 to be independent. To use this function, one logic input (LI) must be re-assigned.

This function is typically used for:

•Machines with automatic/manual operation such as pumps

•Automatic control via a sensor on input AI2, validated by the logic input at state 0

•Manual control via potentiometer on input AI1 (local control)

A graphical representation of reference switching and a connection diagram are shown to the left.

Auto Tune

This parameter causes the drive controller to auto tune the connected motor. When Auto Tune is initiated, the drive controller pulses the connected motor, and measures and stores motor stator resistance and conductor resistance. This allows the drive to provide better current regulation for improved motor torque performance. Auto Tune can be initiated from the keypad or by a logic input assigned to this function. If an output contactor is used, it is necessary to close the contactor before the auto tune function is initiated.

09/2003