Parker 590 series, Product Manual

Page: 19 / 242

2-3
Control Features
Control
Control Circuits Fully isolated from power circuit (SELV)
Output Control
•
Fully controlled 3-phase thyristor bridge
•
Microprocessor implemented phase control extended
firing range
•
For use on 50 or 60Hz supplies with a frequency
compliance range of 45 to 65Hz
•
Phase control circuits are phase rotation insensitive
Control Action
•
Fully digital
•
Advanced PI with fully adaptive current loops for
optimum dynamic performance
•
Self Tuning Current Loop utilising "Autotune"
algorithm
•
Adjustable speed PI with integral defeat
Speed Control
•
By Armature Voltage feedback with IR compensation
•
By Encoder feedback or analog tachogenerator
Speed Range 100 to 1 typical with tachogenerator feedback
Steady State
Accuracy
•
0.01 % Encoder Feedback with Digital setpoint
(serial link or P3)
•
0.1 % Analog Tach Feedback
•
2 % Voltage Feedback
•
Absolute (0.0% error) using QUADRALOC Mk II
digital controller
Note: Long term analog accuracy is subject to
tachogenerator temperature stability.
Adjustments All adjustments in software can be altered by on-board
pushbuttons or via serial communications. An LCD
display provides monitoring of adjustment parameters
and levels, in addition to diagnostic facilities.
Protection
•
High energy MOVs
•
Overcurrent (instantaneous)
•
Overcurrent (inverse time)
•
Field failure
•
Speed feedback failure
•
Motor overtemperature
•
Thyristor Stack overtemperature (Force ventilated
units)
•
Thyristor "Trigger" failure
•
Thyristor Snubber Network
•
Zero-speed detection
•
Standstill logic
•
Stall protection
Diagnostics
•
Fully computerised with first fault latch and
automatic display
•
Digital LCD monitoring
•
Full diagnostic information available on
RS422/RS485
•
LED circuit state indication
Table 2-1 Control Features