Reference Amplitude

Type:	Axis Parameter Register
Address:	RMC75: n/a RMC150: %MDn.15, where n = 24 + the axis number RMC200: n/a
System Tag:	_Axis[n].RefAmp, where n is the axis number
How to Find:	Axes Parameters Pane, Setup tab: Primary Control Setup
Data Type:	REAL
Units:	V RMS
Range:	1.42 to 4.80
Default Value:	2V

Description

This parameter applies only to the Resolver (R) module. This parameter specifies the RMS amplitude of the reference signal transmitted by the Resolver (R) module to the resolver device.

Note: This parameter does not apply to the RW module.

Changing this Parameter

To change this parameter, click the cell, then click the Ellipsis button.

Your resolver specification sheet should indicate either a Transformation Ratio or the Input and Output Voltages. Use the radio button to select the type of information you will use to configure the interface and then enter the appropriate information in the appropriate edit boxes.

Notice that the RMC expects a 2 Vrms signal from the resolver, and this may not match up with your resolver’s specification. This is generally OK. RMCTools will use the information you supplied to calculate the correct reference output voltage to obtain 2 Vrms back from the resolver. Some resolvers are specified for operation at 11 or 26 Volts. These resolvers will generally still work well at 2 Volts, but there is some potential loss of accuracy and the signal-to-noise ratio will be reduced. Contact Delta Motion to discuss options for your application.

Both Resolver interfaces on a Resolver (R) module must always be set to the identical Reference Amplitude. Changing the Reference Amplitude on one input will automatically change it on the other input.

Because this parameter affects motion, the axis must be disabled or in Direct Output before writing to this parameter. The Enabled and Direct Output Status Bits indicate these states of the axis. When changing this parameter from RMCTools, the software will automatically do this for you. This may cause a halt on the axis, which is expected.