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
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 DC voltage 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.
Supply Voltage: 120/240 Vac, 50/60 Hz Input Signal Voltage: 0-5 to 0-25 Vdc or 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)
† All dollar amounts on this site are shown in US currency.
Note: By adding a resistor across signal input, OMDC-VSI can function as a current signal isolator Comes complete with operator’s manual. Ordering Example: (1) OMDC-VSI Voltage Signal Isolator for master/follower operation of DC motors, $207.00