2-6 Product Overview 590 Series DC Digital Drive
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
Typical Steady State Accuracy
• 0.01 % Encoder Feedback with Digital setpoint (serial link or P3)
• 0.1 % Analog Tach Feedback
• 2 % Voltage Feedback
NOTE Long term analog accuracy is subject to tachogenerator temperature stability.
Adjustments
All adjustments in software can be altered by
the MMI or via serial communications. The MMI provides monitoring and adjustment of 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
• LED circuit state indication
Table 2-1 Control Features
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