Delta Tau GEO PMAC User Manual

strands at high frequencies. 

4.  Motor cable shields should be bonded to the back panel using 360-degree clamps at the point they 

enter or exit the panel. 

5.  Motor shields are best grounded at both ends of the cable.  Again, connectors using 360-degree shield 

clamps are superior to connector designs transporting the shield through a single pin.  Always use 
metal shells. 

6.  Running motor armature cables with any other cable in a tray or conduit should be avoided.  These 

cables can radiate high frequency noise and couple into other circuits. 

An external 24VDC power supply is required to power the logic portion of the Geo drive.  This power can 
remain on, regardless of the main AC input power, allowing the signal electronics to be active while the 
main motor power control is inactive.  The 24V is wired into connector J4.  The polarity of this 
connection is extremely important.  Carefully follow the instructions in the wiring diagram.  This 
connection can be made using 16 AWG wire directly from a protected power supply.  In situations where 
the power supply is shared with other devices, it may be desirable to insert a filter in this connection. 
The power supply providing this 24V must be capable of providing an instantaneous current of at least 
1.5A to be able to start the DC-to-DC converter in the Geo drive.  In the case where multiple drives are 
driven from the same 24V supply, it is recommended that each drive be wired back to the power supply 
terminals independently.  It is also recommended that the power supply be sized to handle the 
instantaneous inrush current required to start up the DC-to-DC converter in the Geo drive. 

J4:  24VDC Input Logic Supply Connector 

1 

24VDC RET 

Common 

Control power return 

 

2 

+24VDC 

Input 

Control power input 

24V+/-10%, 2A 

Connector is located at the bottom side of the unit 

The cable wiring must be shielded and have a separate conductor connecting the motor frame back to the 
drive amplifier.  The cables are available in cable kits (CABKITxx) from Delta Tau (see Appendix A). 
Motor phases are conversed in one of three conventions.  Motor manufacturers will call the motor phases 
A, B, or C.  Other motor manufacturers call them U, V, W.  Induction motor manufacturers may call them 
L1, L2, and L3.  The drive’s inputs are called U, V, and W. Wire U, A, or L1 to the drive’s U terminal.  
Wire V, B, or L2 to the drive’s V terminal.  Wire W, C, or L3 to the drive’s W terminal.The motor’s 
frame drain wire and the motor cable shield must be tied together at the mounting stud (5mm thread) on 
top of the Geo drive product.   

1 

U 

Output 

Axis 1 Phase1 

 

2 

V  

Output 

Axis 1 Phase2 

 

3 

W  

Output 

Axis 1 Phase3 

 

On Gxx201xx and Gxx301xx, there is a fourth pin for ground connection. 
Connector is located at the top side of the unit, for Ground connection use the screw with a lug 

1 

U 

Output 

Axis 2 Phase1 

2- Axis drives only 

2 

V 

Output 

Axis 2 Phase2 

2- Axis drives only 

3 

W  

Output 

Axis 2 Phase3 

2- Axis drives only 

Connector is located at the top side of the unit, for Ground connection use the screw with a lug