Basic Slave Mode Setup - PowerTec Digimax Installation And Operation Instruction Manual

BASIC SLAVE MODE SETUP --

BASIC SLAVE MODE SETUP -- BASIC SLAVE MODE SETUP -- BASIC SLAVE MODE SETUP -- BASIC SLAVE MODE SETUP --
The default parameters allow one motor to follow another motor with the same PPR encoder exactly
when 1.0000 is used as a SETPOINT. Other combinations of motor RPM and PPR require a different setup.
The main setup point is parameter #4. This parameter compensates for differences in RPM, frame sizes, and
mechanical gearing. Essentially,
The RPM numbers are the speeds at which the two motors will be running when they are running at
equal process speeds. Normally the SETPOINT is 1.0000. If the SETPOINT is some number other than
1.0000, the number derived in the formula above must be divided by the desired SETPOINT number.
REMEMBER TO PRESS [ENT] AFTER EACH NUMBER ENTRY!
EXAMPLE 2: Suppose a 1750 RPM, 5 HP, 184T frame motor with a standard Model 1000 control which
is running a machine co-ordinated with the motor in EXAMPLE 1. This machine runs 125 YPM at 1750 RPM.
It must deliver 100 YPM when the motor in EXAMPLE 1 is running 100 YPM and the ratio is 1.0000. The
display should read in YPM in 0.1 YPM increments. The UP and DN buttons will be used to increase and
decrease speed.
1. The SETPOINT for equal speeds will be 1.0000.
2. Press [PGM] (code) [ENT} to access parameters. Go to parameterP-01.
3. Enter 1750 in parameter P-01. Press the UP button.
4. Enter 1250 in P-02 (125.0 YPM, which is the speed at 1750 RPM). Press the UP button.
5. Enter 1 in P-03 (one decimal place). Press the UP button.
6. The follower motor speed is 100/125 X 1750 RPM at a SETPOINT of 1.0000. This comes
out to 1400 RPM. The motor in EXAMPLE 1 has a 240 PPR encoder, and this motor has a 120
PPR encoder. Using the formula above, 1400/2500 X 120/240 = .28. Enter 0.2800 in parameter
P-04b (you may press "2800", leading zeroes are not necessary). Press the UP button.
7. Enter 120 (PPR) in P-05. Press the UP button.
8. The accel and decel rates do not affect the response to the master frequency. The slave will
respond quickly to changes in input frequency at TB2 terminals 13 and 14. But the rates do affect
the response to the UP and DN in the MOP mode. We want a slow response to these buttons.
We may also change the SETPOINT manually. Accel and decel rates will also control this rate
of change. So enter 2000 into P-06. Press the UP button. Enter 2000 into P-07. Press UP button.
9. Enter 1 in P-08 for the slave mode. Press the UP button.
10. Enter 0.1000 in P-09 for a preset ratio of 0.1. Press the UP button.
11. Enter a 100 in P-10 to change the speed by 1% (1.0000 to 1.0100) when the UP button is
pressed for less than 1/2 second. Press the UP button. Enter a 100 in P-11 to do the same for
the DN button. After the UP or DN buttons have been pressed for more than 1/2 second, the ratio
will change at the accel or decel rate, respectively. Press the UP button.
12. Enter a 1 in P-12, though this parameter isn't used in SLAVE mode. Press the UP button.
13. Enter a 1 in P-13 for MOP operation. Press the UP button.
14. Enter a 1 in P-14 to make the DIGIMAX IV go to ratio on start. Press the UP button.15.
15. Enter 1 in P-15 for a 1 second update. Press the UP button.
16. Enter a 1 in P-16 to prevent changes while running. Press the UP button.
17. P-17 and P-18 pertain to the RS-422. Press the UP button twice.
18. Enter a 0 in P-19. Press the UP button.
19. Skip P-20. Press the UP button.
20. Enter 21452 (the operator's access code which we created in the previous example). If the
advanced functions are not to be used, press [PGM] and the unit is ready for service.
21. When the unit is ready, enter 1.0000 into the keypad as a SETPOINT.
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RPMslave
Parameter #4 = --------------
RPMmaster
PPRslave
X --------------
PPRmaster
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