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
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