PowerTec DFS-1 ユーザーズマニュアル

Page 10

DFS-1 Manual

Revised 7/95

POWERTEC Ind. Corp.©

FREQUENCY OUTPUT:

There are two outputs available to supply a

frequency for external use.

The first is located at TB2:B terminal 10 (+) and

11 (-). This is an output which is intended to provide

a reference frequency input for another DFS-1,

BCDMAX or CRM-1. This output is not compatible

with the DIGIMAX. It will provide a signal of +/-

1.5V minimum when connected to another DFS-1's

reference frequency input. This output on a unit

configured as a master, operates at 16 times the

frequency of the motor speed output reference. There

is a 120 ohm termination resistor built into the output

for transmission line termination.

When operating the DFS as a slave, the output

frequency is internally divided by 16 in addition to

being multiplied by the set ratio from the slave. As a

consequence, the frequency output from a DFS slave

cannot be used as the reference to another DFS slave

without some way of first multiplying this frequency

by 16. POWERTEC’s Cascade Ratio Multiplier

option board (4001-153430-XXX) can be used for

this purpose. Contact the factory for any frequency

following application which requires a reference

source other than a master DFS.

The other frequency output is at TB2:B13. This

is a 24VDC peak square wave referenced to the DFS-

1 common (TB2:B14). This signal is at the motor

speed output reference frequency and may be used

to interface with a DIGIMAX or a BLDC motor

control. This output sources a maximum of 10mA

and can sink 30mA.

DIGITAL INPUTS:

There are eight digital control inputs on TB2:A

as well as a +24VDC supply (TB2-A14) and com-

mon (TB2-A1). The eight inputs are optical isolator

input diodes with a common cathode connection at

TB2-A2. When the +24VDC, DFS-1 supply is used

to power the inputs, TB2:A2 must be jumpered to

the 24VDC common terminal on TB2:A1.

The functions of all inputs are programmable

except Emergency Stop (TB2-A3). All digital inputs

are electrically isolated from the DFS-1 power

supplies and common when an external power supply

is used to power the digital inputs (such as from a

PLC).

The default parameter setup is for a set of

standard motor controller input connections on

TB2:A terminal strip (see figure 3 on page 3).

Five of the inputs are set up for standard push-

button operation of the DFS-1. They are:

Run

4 (+)

Preset

5 (+)

UP (increase)

6 (+)

DOWN (decrease)

7 (+)

Reverse

8 (+)

All of these inputs are referred to TB2-A2. Note

that TB2-A2 (the common cathode connection) must

be jumpered to common (TB2:A1) in the basic

connections.

Each of these inputs will take a +24VDC input

(no more than 30VDC, not less than 18VDC). If an

external source of +24VDC is used, TB2-A2 on the

upper level must be connected to the negative side of

the external source.

Figure 5: Slaving DFS-1 units with the Reference Frequency Output.

Mode of Operation:

differential

Number of receivers:

32 maximum

Maximum Cable Length:

4000 feet

Maximum Frequency:

10 Megahertz

Common Mode Voltage:

+12V, -7V

maximum

Driver Output:

+/-1.5V minimum

Driver Load:

60 ohm minimum

Driver Short Circuit: 1

50 mA to ground

Driver Output Resistance:

120 ohms (ON)

Receiver Input Resistance:

12 Kohms

Receiver Sensitivity:

+/-200 mA