Chapter 3 Flow of machine Adjustment
|
HES Series
3-9
leaking and for any noise in the oil pump.
When the air is vented completely, if there is any pressure fluctuation while the system is in
action, please refer to the methods listed in the "Descriptions of Parameters" to adjust the
pressure control PI parameter.
Step 7. Injection/Hold up Adjustments
Conduct material line heating to reach the preset temperature, with the controller in manual
control mode.
Set the Ki value of the three-stage PI to 0 (Pr. 00-21, 00-23, and 00-25
）
and the three-stage
Kp value to be small (
≦
50.0)
Execute the injection, with “Preset Target” set at low pressure (
＜
50Bar) and low flow rate
(
＜
30%)
Press “Injection” on the controller and the injection will be started or the system will directly
enter the hold up action (depending on the location of the oil tank)
In the hold up state, observe the waferform through the software tool (VFD-Explorer).
Increase the speed bandwidth to the maximum value of 40Hz (Pr. 00-10) while causing no
vibration to the gasoline-electric servo motor.
In the hold up state, when the pressure gauge needle or the monitored waferform shows no
signs of vibration, the pressure feedback is stabilizing. Now the three sets of Kp values can
be increased.
When the pressure feedback becomes unstable, lower the three sets of Kp values by 20%
(Example: lower the preset values of the three sets of Kp values from 100% to 80%),
followed by adjusting the three sets of Ki values to eliminate the steady-state error and
speed up the system response.
Upon completion of the above steps, increase the pressure command of “Preset Target”.
Observe if the pressure feedback becomes stable. Proceed with troubleshooting in case of
any anomaly, as described below:
Troubleshooting for Pressure Instability
Unstable pressure over the entire section
1.
Set Pr. 00-09 = 0 for speed control
2.
With the oil line in the closed state, send the low speed rotation command to make the
pressure feedback 40~50% of the pressure command value (Pr. 00-07)
3.
Check if the pressure waveform shows any jitters through the monitoring software.
Jitter in Pressure Waveform
The possible cause is interference from ground. If the motor or the three-phase
power supply is grounded, disconnect the ground wire. If the motor or the
three-phase power supply is not grounded, add the ground wire for interference
protection.
The other possibility is the ground issue of the shielding mesh (as illustrated by
Call 1(800)985-6929 for Sales
deltaacdrives.com
Call 1(800)985-6929 for Sales
deltaacdrives.com
