Omega OMDC-VSI User guide

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LTVSIHU (side 1 of 2)

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Darts VSI Voltage Signal Isolator Series Features

The Dart VSI (voltage signal isolator) permits the user to control the output of a variable speed drive with a grounded or ungrounded DC input signal. The range of this input signal can be field selected for a range of 0-5 through 0-25 or 0-25 through 0-250VDC. The input impedance of these ranges is 150Ký and 1.2Mý, respectivly. The GAIN trimpot is used to adjust the output of the VSI to full on when a full speed signal is applied to its input terminals. The VSI incorporates Darts patented feedback circuit, which virtually eliminates output changes due to the thermal drift of logic components. The VSI is packaged in an aluminum chassis mount housing and contains an on-board power supply for its logic circuit, which is powered from 120 VAC or 240 VAC line power. An electrical isolation rating of 2500Vrms is achieved by the use of an optically isolated IC package. The VSI requires an AC input to drive the power supply and is available in two variations.

Although this isolator was specifically designed to be used with Darts 500/530B series, it can be used with virtually any speed control that has a speed reference circuit of +5 to +15VDC and an input impedance greater than 47Ký. The output of the VSI is a filtered, pulse width modulated signal that is directly proportional to the input speed signal. The wide input range allows the VSI to follow signals as low as +5V logic levels and up to the 180VDC levels present at the armature leads of a 180VDC motor. By simply connecting the input terminals across the armature leads of a "master motor", you can use the VSI for master/follower operation. The addition of a scaling pot will provide for proportional follower operation.

Hook-up Diagram

4.250"

SLOT

DEPTH

.188" DIA.

(6 SLOTS)

VSI SERIES

GAIN

TRIMPOT

-1

-2 -3 -4 -5 -6 -7 -8

AC AC HI W LO COM +5V SIG

1.750"

3.625"

Setup Procedures

SELECTION

RANGE

JUMPER

-3 -2 -1

.315"

3.620"

.600"

.380"

1.600"

1. With no power to VSI or speed control, connect a DC voltmeter (meter must not be grounded) to the speed control output as follows: meter COMMON to the -ARM terminal and meter POSITIVE to the +ARM terminal. Select the correct meter range based upon the armature voltage level.

2. Install the jumper clip for the proper input voltage range (see description on the hook-up page) and preset the gain trimpot fully CCW.

3. Preset speed control trimpots: MIN, MAX, I.R. COMP fully CCW and CL fully CW.

4. Apply AC input of correct voltage to the speed control and the VSI.

5. With 0VDC into the VSI, adjust MIN to the desired setting.

6. Apply maximum input voltage to the VSI. The motor will begin to rotate.

7. Turn the GAIN trimpot CW until no further change in the output voltage occurs, then turn CCW one turn, then set the max trimpot to desired setting.

8. Set Current Limit per speed control instuctions.

9. For closed loop systems, the I.R. COMP should remain CCW. For open loop systems, set I.R. COMP as needed.

Page 2

CONFIGURATIONS

AC INPUT

DUAL VOLTAGE INPUT

CONNECT TO

SPEEDPOT INPUT

OF MOTOR CONTROL

SIGNAL COMMON

SIGNAL POSITIVE

VSI HOOK-UP

AC AC HI

{

N.C.

W LO COMMON +5V SIGNAL IN

-3

-2

-1

STANDARD HOOK-UP

JUMPER

CLIP **

GAIN

TRIMPOT

- ARM

+ ARM

NOTES:

AC INPUT

DUAL VOLTAGE INPUT

CONNECT TO

SPEEDPOT INPUT

OF MOTOR CONTROL

MASTER

MOTOR

250VDC

MAX.

{

RATIO POT *

(0-100% of Master)

N.C.

250K

AC AC HI W LO COMMON +5V SIGNAL IN

GAIN

TRIMPOT

-3

-2

-1

JUMPER

CLIP **

FOLLOWER MODE HOOK-UP

If ratio of Master is NOT needed, delete the 250K pot and connect

+Armature directly to Signal Input.

Jumper clip is used to select input voltage range. When installed from

P4-1 to P4-2, the range is 0-25VDC thru 0-250VDC; when installed from P4-2 to P4-3, range is 0-5VDC thru 0-25VDC.

PRN #

693

ECN NO.

ECN NO. DATE: DESC:

DATE: DESC:

1149

1264

------

REVISIONS

3-15-91

4-20-92

10-03-95

INTRODUCTION

PC LAYOUT CHG.

ADD LT NUMBER

UNLESS OTHERWISE SPECIFIED:

DIMENSIONS ARE IN INCHES

TOLERANCES

DECIMALS ANGULAR

.XXX ± .025 ±

DO NOT SCALE DRAWING

DART CONTROLS, INC.

5000 W. 106th STREET ZIONSVILLE INDIANA 46077

TITLE:

VSI HOOK-UP CONFIGURATIONS DART LITERATURE # LTVSIHU (SIDE 2 OF 2)

DWN:

GMM

SCALE:

RELEASE DATE:

REF. DWG. NO.

MAT'L:

T-80 ALUMINUM

3-25-91

A-1-

REV. DATE:

CUST:

FINISH:

6-30-97

PROCESS CONTROLS

DEBURR &

DWG. NO.

A-1-2154C