Varispeed AC Software Functions : Applicable for flux vector control. 13 Function Target Market Application Description of Function Multi-Function Selection (Cont’d) Torque Control Cranes Torque booster (Twin drives) Adjusts motor torque externally. Appropriate for controlling the result of torque booster. Droop Control Separately-driven conveyors and transporting equipment Dividing loads Arbitrarily sets motor speed regulation. High insulation characteristics share multi-motor loads. Upper/Lower Frequency Limit Operation Pumps and blowers Motor speed limit Upper and lower limits of the motor speed, reference signal bias and gain can be set independently without peripheral operation units.
Prohibit Setting of Specific Frequency (Frequency Jump Control) General Preventing mechanical vibration in the equipment The motor can simply pass through the preset speed, but continuous running cannot be done at this speed. This function is used to avoid mechanical resonance points. Carrier Frequency Setting General Reducing noise The carrier frequency can be set to reduce acoustic noise from the motor and machine system. Use to set the carrier frequency to 4 kHz, 8 kHz, or 12 kHz for flux vector control.
Automatic Continuous Operation when the Speed Reference is Lost Air conditioners Improvement of continuous operation reliability When the frequency reference signal is lost, operation is automatically continued at the pre-programmed speed. (If the host computer fails.) This function is important for air conditioning systems in intelligent buildings. Multi-Function Signal Output Load Speed Display General Monitor function enhancement Can indicate motor speed (min-1), machine speed under load (min-1), line speed (m/min), etc. Run Signal General Zero-speed interlock, etc. “ Closed ” during operation. “ Open ” while coasting to a stop. Can be used as an interlock contact point during a stop.
Zero-speed Signal General Zero-speed interlock “ Closed ” when output frequency is under min. frequency. Frequency (Speed) Agreed Signal General Reference speed reach interlock “ Closed ” when inverter output frequency reaches the set value. Can be used as an interlock for lathes, etc. Overtorque Signal Blowers Protection of machine Improvement of continuous operation reliability “ Closed ” when overtorque setting operation is completed. Can be used as a torque limiter. Low Voltage Signal General Assortment of fault signals “ Closed ” only when tripped by low voltage. Can be used as a countermeasure power loss detection relay.
Free Unintentional Speed Agreement Signal General Reference speed agreed interlock “ Closed ” when the speed agrees at the arbitrary frequency reference. Output Frequency Detection 1 General Gear change interlock, etc. “ Closed ” at or over the arbitrary output frequency. Output Frequency Detection 2 General Gear change interlock, etc. “ Closed ” at or below the arbitrary output frequency. Base Block Signal General Operation interlock, etc. Always “ closed ” when the MxC output is OFF. Frequency Reference Sudden Change Detection General Improvement of continuous operation reliability “ Closed ” when the frequency reference suddenly drops to 10% or less of the set value.
Can be used to detect an error in the host controller. Analog Input Multi-function Analog Input Signal General Easy operation Functions as a supplementary frequency reference. Also used for fine control of frequency reference, output voltage adjustment, external control of accel/decel time, and fine adjustment of overtorque detection level. Analog Output Multi-function Analog Output Signal General Monitor function enhancement Use two of the following devices: a frequency meter, ammeter, voltmeter wattmeter, or U1 monitor. Input Option Analog Input (Optional) General Easy operation Enables external operation with high resolution instructions (AI-14U, AI-14B).
Also enables normal and reverse operation using positive or negative voltage signals (AI-14B). Digital Input (Optional) General Easy operation Enables operation with 8-bit or 16-bit digital signals. Easily connects to NC or PC (DI-08, DI-16H2). Output Option Analog Output (Optional) General Monitor function enhancement Monitors output frequency, output current, and I/O voltage (AO-08, AO-12). Digital Output (Optional) General Monitor function enhancement Indicates errors through discrete output (DO-08). Option PG PG Speed Control (Optional) General Enhancement of speed control Installing PG control card (PG-B2 and PG-X2) considerably enhances speed control accuracy.