A1 Introduction; A1.1 What Is The Difference Between The Ds9000A And The Ds9000; A1.1.1 Ds9000 Modes Of Operation; A1.1.2 Ds9000A Modes Of Operation - Seco DS9000 Installation & Operation Manual

A1 INTRODUCTION

DS9000A – THE ANALOG INTERFACE DS9000
The ANALOG INTERFACE equipped DS9000A unit differs somewhat in setup and operation from
the regular DS9000 unit. The standard DS9000 Instruction Manual, P-992, must be used with this
manual to start-up and operate the DS9000A.
A1.1 WHAT IS THE DIFFERENCE BETWEEN THE DS9000A AND THE DS9000?

A1.1.1 DS9000 MODES OF OPERATION

The standard DS9000 can operate as either a Master Digital Speed Controller (Function A) or as a
Digital Follower (Function B).
Function A). DIGITAL MASTER MODE - As a Master Speed Controller, the motor speed command is
programmed into the DS9000 by using the keyboard. The DS9000 sends a 0 to 10 VDC speed
command to the Drive and a digital feedback device on the motor, a ring kit or encoder, provides the
motor speed feedback to the DS9000 for closed loop speed control.
Function B) DIGITAL FOLLOWER MODE – When used as a Digital Follower, a digital feedback
device on the Master motor or roller provides a digital Master reference signal that is connected to the
Follower DS9000. Now instead of programming a speed command into the DS9000A, a Follower ratio
is programmed into the DS9000A to set the Follower Motor. A ratio value of 1.0000 programmed into
the DS9000 would provide an exact speed match between the Master motor and the Follower motor
(with the same p.p.r. on the feedback devices mounted on the two motors).
The DS9000A has three additional modes of operation.

A1.1.2 DS9000A MODES OF OPERATION

A typical system consists of a DS9000, an AC or DC Drive, and an AC or DC Motor with digital
feedback. In all cases the motor-mounted digital feedback is required by the DS9000 for closed-loop
control. The DS9000A will hold motor speed to within ±0.05% of motor base speed. The motor speed
can be displayed on the DS9000 readout in RPM or engineering units.
Mode 1). ANALOG MASTER MODE – Instead of a digital speed command programmed into the
DS9000A (Function A), a speed potentiometer input, an isolated 0-10 VDC or 4-20 mA analog input
signal is supplied to the DS9000A by the user.
Mode 2). ANALOG FOLLOWER/DIGITAL RATIO MODE – Similar to Mode 1 an external analog
input is connected to the DS9000A but like Function B a digital ratio is programmed into the
DS9000A with the keypad. The operator can change the relationship of motor speed to the analog
input by changing the ratio value.
Mode 3). DIGITAL FOLLOWER/ANALOG RATIO MODE – Similar to Function B on the DS9000
but instead of a digitally programmed ratio stored in the DS9000A by the keyboard, an external analog
signal of 0-10 volts, 4-20 mA, or a potentiometer may be used to "scale" or ratio the motor speed. The
ratio set by the analog signal can be displayed on the DS9000A readout. This mode allows remote
speed trim of digital follower applications.
A2