PowerTec DFS-1 manual Frequencyinput, Analog Outputs

The default speed reference input is Analog Input #1, located on TB1:B. The default input is for a 0 to +10VDC for zero to full speed of the motor. Terminal 3 is the positive side of the input and terminal 4 is the negative side. If the speed signal being used is externally supplied, the differential input will have a noise cancelling effect. Terminal 1 on TB1:B is a common for shields.

Reference sources of +10VDC and -10VDC are supplied on the terminal strips at TB2:B2 and TB2:B7, respectively. The default speed pot connec- tions should be made as illustrated in figure 3. Notice that the (-) side of the differential input (terminal 4) is connected by a jumper to common (terminal 1), because the DFS-1 reference source is being used. If an external reference source is to be used, no jumper is necessary.

IN THE DEFAULT SETUP, ONLY ANALOG INPUT #1 IS ACTIVE. WHILE THE OTHER ANALOG INPUT HAS A DEFAULT SETUP, IT IS NOT ACTIVE UNTIL THE USER CHANGES THE SETUP TO MAKE IT ACTIVE.

The microprocessor will look ONLY to Analog Input #1 for speed information until it is told to do otherwise in the setup program.

The other analog input to the DFS-1 is at TB1:B (lower level) terminals 5 (+) and 6 (-). Both of the inputs may be programmed for one of six inputs as shown in the table below.

4.Comm set (value is set via Communica- tions)

5.Commanded speed

Analog Output #1 default is a -10 to +10VDC signal representing motor speed. The outputs are on TB1:B terminals 8 (+) and 10 (-). The opposite polarity is available by a parameter change. See the description for parameters #26 and #27.

The default for Analog Output #2, terminals 9

(+)and 10 (-), is -10 to +10VDC representing motor load, 0% to 150% load. The opposite polarity is available by changing a parameter.

The maximum output current for the analog outputs is 20 milliamps.

FREQUENCYINPUT:

There is only one frequency input on the DFS-1. This input is used by the drive as the reference to follow when the drive is in the SLAVE Mode of operation. This input cannot be reassigned.

If the DFS-1 is in the MASTER mode, it will ignore the frequency input.

The Frequency input is located at TB2:A terminals 11(+) and 12 (-). This input is a differential line receiver type intended to interface directly with another DFS-1, a BCDMAX or CRM-1. There may be multiple slaves connected to a single Master by

				TB1:B	TB1:B
Input Signal Level			(+) input term		(-) input term		jumper terms	input impedance
-10	to	+10 VDC	3	or 5	4	or 6	none **	200 Kohms
0	to	+10 VDC	3	or 5	4	or 6	none **	200 Kohms
0	to	+5 VDC	3	or 5	4	or 6	none **	200 Kohms
1	to	+5 VDC	3	or 5	4	or 6	none **	200 Kohms
0	to	20 mADC	3	or 5		1	4 or 6 to 1	250	ohms
4	to	20 mADC	3	or 5		1	4 or 6 to 1	250	ohms

** if the DFS-1 supplies are used, jumper 4 or 6 to 1 to establish the reference common.

ANALOG OUTPUTS:

There are two analog outputs on TB1:B. Each of the outputs may be programmed in several ways:

1.Disabled

2.Actual speed (value is proportional to motor speed)

3.Load output (value is proportional to motor load)

daisy-chaining the frequency reference line. The last slave on the line should have the jumper at JP1 on the two rightmost pins. This inserts a terminating resistor at the end of the line to help eliminate electrical noise from the system. All others should be on the two leftmost pins.

Contact POWERTEC’s Application Engineering Department before trying to use another type of frequency on this input.

Revised 7/95	DFS-1 Manual	Page 9
POWERTEC Ind. Corp.©