Dart Controls 250 Series Catalog Page

250 Series
Variable Speed DC Control

Chassis

NEMA 4/12

Speed Potentiometer

Kit Included

cULus Listed

The 250 Series offers superb
flexibility, reliability, and
value. A general purpose,
economical control rated to 2
horsepower, it provides the
ultimate in standard features
and versatility including:

dual voltage (120/240 VAC),
adjustable H.P. settings,
packaged power bridge,
barrier terminal strip, fully
rated-no auxiliary heatsink
required, and chassis or
NEMA 4/12 enclosure. Many

options further extend the 250’s
capabilities.

Washdown Duty

A logical, easily accessible
layout simplifies installation
and adjustment. Clean design,
quality components and careful
assembly are trademarks of
Dart Controls.

250 SERIES STANDARD FEATURES

• Dual voltage - 120/240 VAC, 50/60Hz

• Adjustable horsepower settings

• Barrier terminal strip

• Packaged bridge supply (fullwave)

• 1% speed regulation with armature voltage feedback;
±1/2% with tach feedback

• Adjustable Minimum speed (0–30% of max)

• Adjustable Maximum speed (66–110% of base)

• Adjustable IR Compensation

• Adjustable Linear Acceleration (0.5-8 sec.)

• Adjustable Current Limit to 15 Amps

• Line voltage compensation

• 5K ohm speed potentiometer with 8" leads, knob and
dial included

• Power on/off switch (enclosed models)

• 50:1 speed range

• Overload capacity: 150% for one minute

• Transient voltage protection

• Voltage following mode or DC tachometer follower by
supplying ungrounded analog input signal (0–12 VDC)

• DC tachometer feedback (6V at base speed)

• Inhibit circuit - permits start & stop without
breaking AC lines

• Remote start/stop via pot circuit or inhibit circuit

• Shunt fi eld supply provided (1 Amp max; 100V for
120 VAC; 200V for 240 VAC input)

• AC line fuse

• Enclosed models rated NEMA 4/12 w/threaded conduit
holes

ELECTRICAL SPECIFICATIONS AC INPUT 50/60 HZ

120 VAC Single Phase Input, 0-90 VDC Output

MAX. AC MAX. ARM*
H.P. AMPS KVA AMPS DC

1/50 0.5 0.06 0.4
1/20 1.0 0.12 0.8
1/8 2.0 0.24 1.6
1/4 3.5 0.42 2.7
1/3 4.4 0.53 3.4
1/2 6.5 0.78 5.0
3/4 9.3 1.12 7.2
1 13.2 1.58 10.2

240 VAC Single Phase Input, 0-180 VDC Output

MAX. AC MAX. ARM*
H.P. AMPS KVA AMPS DC

1/4 1.8 0.42 1.4
1/3 2.2 0.53 1.7
1/2 3.3 0.78 2.5
3/4 4.8 1.15 3.7
1 6.5 1.56 5.0
1 1/2 9.7 2.33 7.5
2 12.9 3.10 9.9

For dual voltage 250 series, use table for the input voltage you are using.
* Minimum Armature Amps: 150mA D.C.

POPULAR OPTIONS

250 SERIES SELECTION GUIDE

H.P. RANGE CHASSIS “C” ENCLOSED “E”

120 VAC Single Phase Input, 0-90 VDC Output

1/50 - 1/8 251G-12C 251G-12E
1/8 - 1.0 253G-200C 253G-200E

240 VAC Single Phase Input, 0-180 VDC Output

1/25 - 1/4 251G-12C 251G-12E
1/4 - 2.0 253G-200C 253G-200E

Horsepower settings are adjustable, 1/50 thru 1/8 and 1/8 thru 2 - see
installation manual. Control is tested and calibrated for maximum
horsepower in its category.

DIMENSIONAL SPECIFICATIONS

MODEL WIDTH LENGTH DEPTH WEIGHT

English (inches)

Chassis 5.53 7.00 1.63 14.25 oz.
Enclosed 5.53 7.25 2.75 17.50 oz.

Metric (centimeters)

Chassis 14.1 17.78 4.14 404 gm.
Enclosed 14.1 18.42 6.98 486 gm.

OPERATING CONDITIONS

Temperature ........................................................-10° to +45° C.

AC Input Voltage ........................... ±10% Rated Line Voltage

Input Frequency ........................................................ 50/60 Hz.

-55G2 option
boards

-5 option board

OPTION DESCRIPTION

OPTION SUFFIX

NEMA 4X Enclosure .............................................................-4X

4-20mA isolated signal follower (chassis only) .................-5*

-5 option with Auto/Manual function ................................-7

Decel equals Accel time ..................................................... -17B

Forward-Off-Reverse manual switch

(center blocked, no Dynamic Brake–enclosed only

Forward-Off-Reverse manual switch (center blocked, no

Dynamic Brake - chassis only) ...................................... -29B

Torque control (enclosed only) ......................................... -34A

Isolated voltage follower

(

120/240 VAC input) - controls
speed from any external grounded or ungrounded
signal: 0-5 VDC thru 0-250 VDC adjustable

(chassis only) ................................................................ -55G2*

-55G2 option with Auto/Manual function ..................-56G2

Other options are available, please consult factory for your requirement.

* Field installable
1–Enclosed version is factory installed only. Chassis version is fi eld

installed.

) .......-29

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