Red-lion MDC User Manual download pdf (Page 20)

PROGRAM SCALING MENU (Cont’d)

ADDITIONAL SCALE FACTORS IN FOLLOWER MODE

PPR LD (Pulses Per Revolution- Lead)

Enter the number of pulses per revolution generated by the lead transducer.

If an artificial frequency source is used, set PPR LD to 60. This SETS 1 RPM

= 1 Hz. Max RPM Lead can then be entered in Hz. The value for PPR LD

ranges from 1 to 59999.

MAX RPM LD (Maximum RPM- Lead)

This variable sets the unity ratio. Enter the desired RPM for the lead input

transducer which would cause the follower motor (or shaft) to operate at

MAX RPM FB when a ratio setpoint of 1.0000 is entered. The value for Max

RPM LD does not need to be an actual operating maximum for the lead motor.

It only sets the Unity Ratio.

Follower Speed (RPM) = Ratio Setpoint x Unity Ratio x Lead Speed (RPM)

Where: Unity Ratio =

MAX RPM FB

MAX RPM LD

This allows the user to define a 1:1 setpoint ratio which is different than the

1:1 speed ratio of the motors. The value entered for MAX RPM LD ranges

from 1 to 59999.

Notes:

1. The maximum input frequency for Follower Mode is 12 kHz (lead and

feedback).

2. For optimum performance, choose the Motor Drive System with the highest

frequency signal output as the master or lead system in a Follower Mode

application.

For example, in a Master/Follower application where two motors are driving

conveyors which are feeding product into a hopper, conveyor A must run 2X

faster than conveyor B to get a product mix of 1:1. The maximum speed for both

motors is 1750 RPM. We will use motor B for the Follower since it runs slower

than motor A. The max RPM feedback is set to 1750 (the max motor speed for

conveyor B). Set the unity ratio so that a ratio setpoint of 1.0000 can be used to

indicate a 1:1 ratio for the product mix, not the speed ratio of the motors. Since

the lead motor (A) must run at a speed 2X the follower motor (B), set the max

RPM Lead at a value 2X the follower motor max (3500 RPM). This will

produce a follower speed 1/2 the lead speed when a 1.0000 ratio setpoint is

selected. The value for max RPM Lead does not have to be an actual operating

speed for the lead motor, this value simply sets the unity ratio.

MAX RPM FB = 1750

MAX RPM LD = 3500

Unity Ratio = MAX RPM FB

1750

= 0.5

MAX RPM LD

3500

Using a Ratio Setpoint of 1.0000 and a Lead speed of 1750.

Follower speed = Ratio Stpt. x Unity Ratio x Lead speed (RPM)

Follower speed = 1 x 0.5 x 1750

Follower speed = 875

As you can see, the follower speed is half the lead speed when using a 1.0000

Ratio Setpoint. It is a good practice to set the Unity Ratio so a Ratio Setpoint of

1.0000 can be used as the normal operating setpoint. This will allow the operator

to adjust the Ratio Setpoint in user units of product mix, not motor speeds.

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Red-lion MDC User Manual Page 20

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