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E-DC Drive

Quick Reference Guide

 Motor Performance Specifications

 Protective Circuits

 Current & Resistor Selection

Input/Output Specifications

 Dimensions

Compumotor Division
Parker Hannifin Corporation
p/n 88-020592-01 A 

 (effective May 22, 2002)

INPUTS

All inputs are optically isolated

STEP:
 

minimum pulse width: 200 nanoseconds
maximum input frequency: 

2MHz 

minimum turn on current: 

6.5mA

DIRECTION: 
 

minimum setup time:  

200 microseconds 

minimum turn on current: 

8mA

REMOTE: 
 

minimum turn on current: 

3.5mA 

When input is activated, drive reduces motor current
by ratio set by R

remote

, a resistor connected between

REMOTE and CURRENT, as follows: 
R

remote

 = 13,300 (3750 + R

c

)/(R

c

 - R

s

), where 

R

c

 = resistor asociated with operating current 

R

s

NOTE: for zero current, short REMOTE and CURRENT

GEAR SHIFT: 
 

minimum turn on current: 

3.5mA 

When input is activated, the drive multiplies each
step pulse it receives by a factor of 8.

FAULT OUTPUT

 Optically isolated; open collector/emitter output.
 Normally active (output turns off on a fault condition).
 

To clear fault: cycle power.

 

maximum collector current: 

10mA

Accuracy:

+/- 5 arcminutes typical (unloaded motor,
bi-directional) with OS or VS Motors

Repeatability:

+/- 5 arcseconds typical (unloaded motor,

Hysteresis:

less than 2 arcminutes—0.0334

°

(

Short Circuit Protection:

• phase-to-phase motor short
• phase-to-ground motor short

• trips at 55

°

C (131

°

F) internally

Operating Temperature: 

°

F)

Storage Temperature: 

 176

°

F)

Humidity:
Drive Weight:

SERIES

Hardware Installation Guide

available at: www.compumotor.com

E-DC Hardware Installation Guide

is available online in PDF format:

http://www.compumotor.com
(part number 88-020714-01)

3.555 (90.30)

3.315 (84.20)

5.000 (127.00)

4.650 (118.11)

0.175 (4.45)

1.000 (25.40)

7.000 (177.80)

Mounting Clearance

2x 0.177 (4.50) Thru
(Clearance for #8 
(M4) Mounting Screw)

0.812 (20.62)

1.625 (41.28)

2.000 (50.80)
Mtg Clearance

Dimensions in
inches (millimeters)

1.000 (25.40)

Compumotor

5500 Business Park Dr.
Rohnert Park, CA 94928

Exposed aluminum for 
electrical grounding

This surface must be thermally
coupled to a cold plate in most
applications

REMOTE

REF

CURRENT

DUMP

VDC+

VDC-

A+
A- 
B+
B- 

PWR/FLT

!

SERIES

SW3-#7 Off/#8 Off 

SW3-#7 On/#8 Off

Current  Resistor  

Current Resistor
(amps*)  (ohms)

4.80       0  

1.58       0  
1.52  

619 

4.62

412

1.46 

1.27 K

4.56   

619    

1.39  

2.05 K

4.49   

825    

1.33  

2.80 K

4.43  

1.02 K  

1.27  

3.57 K

4.37  

1.27 K  

1.20  

4.53 K 

4.30  

1.54 K  

1.14  

5.49 K

4.24  

1.78 K  

1.08  

6.49 K 

4.18  

2.05 K  

1.01  

7.68 K 

4.11  

2.26 K  

0.95  

8.87 K 

4.05  

2.55 K  

0.89  

10.5 K 

3.99  

2.80 K  

0.82  

12.1 K 

3.92  

3.09 K  

0.76  

13.7 K 

3.86  

3.32 K  

0.70  

15.8 K 

3.80  

3.57 K  

0.63  

18.2 K 

3.73  

3.92 K  

0.57  

20.5 K 

3.67  

4.22 K  

0.51  

22.6 K

3.61  

4.53 K 

3.54  

4.87 K 

3.48  

5.11 K 

3.42  

5.49 K 

3.35  

5.76 K  

SW3-#7 Off/#8 On

3.29  

6.19 K  

Current  Resistor

3.23  

6.49 K  

(amps*)  (ohms)  

3.17  

6.81 K  

1.27 

0

3.10  

7.32 K  

1.20   

787

3.04  

7.68 K  

1.14  

1.62 K

2.98  

8.06 K  

1.08  

2.49 K

2.91  

8.45 K  

1.01  

3.57 K 

2.85  

8.87 K  

0.95  

4.64 K

2.79  

9.53 K  

0.89  

5.90 K

2.72  

10.0 K  

0.82  

7.32 K

2.66  

10.5 K  

0.76  

8.87 K

2.60  

11.0 K  

0.70  

10.7 K 

2.53  

11.5 K  

0.63  

13.0 K

2.47  

12.1 K  

0.57  

15.4 K

2.41  

12.7 K  

0.51  

18.2 K

2.34  

13.3 K  

0.44  

21.5 K

2.28  

13.7 K  

2.22  

14.3 K 

2.15  

15.0 K 

2.09  

15.8 K  

SW3-#7 On/#8 On

2.03  

16.5 K  

Current  Resistor

1.96  

17.4 K  

(amps*)  (ohms) 

1.90  

18.2 K  

0.50 

0

1.84  

19.1 K  

0.38  

2.21 K

1.77  

20.0 K  

0.32  

5.36 K

1.71  

20.5 K  

0.25  

10.0 K

1.65  

21.5 K  

0.19  

16.2 K 

1.58  

22.6 K  

0.13  

27.4 K

SW3-#7 Off/#8 Off 
(amps*) (ohms) Motor
3.0 S**  7.68 K   

OS2HA

4.8 S** 0 

OS21A, 

22A

VS12B, 13B
VS21B, 23B
VS22B

**

P = Parallel current;

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