Rockwell Automation 1395 DC Drive, 800-1250 Hp, FRN 5.XX-9.30 User Manual

Page 88

Chapter 4
Installation

4-23

Figure 4.13
Typical Analog Input Connections

TB3

+10V DC P.S.

–10V DC P.S.

EXT. VELOCITY REF.

P.S. COMMON

Bi-directional Operation

IMPORTANT: Connect
shield to drive end only.
Other end is to be insu-
lated and left floating.

Reference *

2.5k Ohm

Minimum

TB3

+10V DC P.S.

–10V DC P.S.

P.S. COMMON

Uni-directional Operation

Reference*

2.5k Ohm

Minimum

Forward

Reverse

Reverse Relay

* External to the Drive

EXT. VELOCITY REF.

–

EXT. VELOCITY REF.

–

IMPORTANT: Connect
to either terminal 28 or
29, Not Both

TB10

Analog Input – Velocity and Trim Reference

Connections for the velocity and trim reference inputs can be for uni- or
bi-directional operation, using the internal drive

10VDC power supply

(see Figure 4.13).

Tach Velocity – The Digital Reference Adapter Board is not
pre-configured for DC tachometer feedback. The user will have to
reconfigure the drive by replacing the Trim Velocity Reference (parameter
161) with the Tach Velocity (parameter 156).

The analog tachometer device generates a DC voltage that is direction
sensitive and proportional to speed. The tach output must be connected to
an analog input channel on the Discrete Adapter Board. Most industrial
tachs have an output greater than the

10V range of the analog inputs. The

tach output must be scaled down, by an external voltage divider network,
so that the entire speed range of the motor can be represented by a

feedback signal.

ATTENTION: Connecting a tach which has an output range
greater than

10V directly to the analog input channel can

severely damage the adapter board.