Omega Products OMDC-VSI User Manual

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VOLTAGE SIGNAL
ISOLATOR

OMDC-VSI

$

179

l Accepts Wide Range of

Input Voltages

l Can be Used for Master/

Follower Operation

l Can be Used with Any DC

Speed Control

The OMDC-VSI (voltage signal isolator)
permits the user to control the output of a
variable speed motor drive from any external
grounded or ungrounded DC input signal.
A single model accepts a wide range of input
voltages (0 to 5 through 0 to 25 Vdc or
0 to 25 through 0 to 250 Vdc). The GAIN
trimpot is used to adjust the output of the
OMDC-VSI to full on when a full speed
signal is applied to its input terminals. The
OMDC-VSI incorporates a feedback circuit,
which virtually eliminates output changes
due to the thermal drift of logic components.
The OMDC-VSI is packaged in an aluminum
chassis mount housing and contains an
on-board power supply for its logic circuit.
An electrical isolation rating of 2500 Vrms is
achieved by the use of an optically isolated
IC package.

The OMDC-VSI can be used with virtually
any motor speed control that has a speed
reference circuit of +5 to +15 Vdc and an
input impedance greater than 47 kΩ. The
output of the OMDC-VSI is a filtered, pulse

OMDC-VSI, $179,
shown actual size.

width modulated signal that is directly
proportional to the input speed signal. The
wide input range allows the OMDC-VSI to
follow signals as low as 0 to 5V logic levels
and up to the 180 Vdc levels present at the
armature leads of a 180 Vdc motor. By
simply connecting the input terminals across
the armature leads of a “master motor”, you
can use the OMDC-VSI for master/follower
operation. The addition of a scaling pot will
provide for proportional follower operation.

To Order (Specify Model Number)

MODEL NO. PRICE DESCRIPTION

OMDC-VSI $179 Voltage signal isolator

Comes complete with operator’s manual.
Ordering Example: OMDC-VSI, voltage signal isolator for use with any DC speed control, $179.

D-1

Note: By adding a resistor across signal
input, OMDC-VSI can function as a current
signal isolator.

SPECIFICATIONS

Supply Voltage: 120/240 Vac, 50/60 Hz
Input Signal Voltage: 0-5 to 0-

0-25 to 0-250 Vdc

Output Signal Voltage: +5 to +15 Vdc
Dimensions:

92 W x 108 L x 42 mm D
(3.63 x 4.25 x 1.65")

Weight: 277.3 g (9.8 oz)

AVAILABLE FOR FAST DELIVERY!

25 Vdc or

One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | [e-mail]

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