With its different types of motor control and numerous integrated functions, the
Altivar 71 range of variable speed drives meets stringent requirements.
It is suitable for demanding drive systems:
-Torque and speed accuracy at very low speed, high dynamic performance with Flux Vector Control with or without sensor
-Extended frequency range for high-speed motors
-Parallel connection of motors and special drives using the voltage/
frequency ratio
-Static speed accuracy and energy saving for open-loop synchronous motors
-Smooth flexibility for unbalanced machines with the ENA (ENergy Adaptation)
System.
In conjunction with the wide voltage range for a 690 V a line supply, the Altivar 71
drive’s advanced functions boost performance levels and make machines more
versatile so they can be used for a large number of applications.
The Altivar 71 is factory-set for the most common operating conditions:
• Macro configuration: Start/Stop
• Motor frequency: 50 Hz
• Constant torque application, with sensorless flux vector control
• Normal stop mode on deceleration ramp
• Stop mode in the event of a fault: freewheel
• Linear, acceleration and deceleration ramps: 3 seconds
• Low speed: 0 Hz
• High speed: 50 Hz
• Motor thermal current = rated drive current
• Standstill injection braking current = 0.7 x rated drive current, for 0.5 seconds
• No automatic starts after a fault
• Switching frequency 2.5 kHz or 4 kHz depending on drive rating
• Logic inputs:
– LI1: forward, LI2: Forward (2 operating direction), 2-wire control on transition
– L13, L14, LI5, LI6: inactive (not assigned)
• Analog inputs:
– AI1: speed reference 0 +10 V
– AI2: 0-20 mA, inactive (not assigned)
• Relay R1: The contact opens in the event of a fault (or drive off).
• Relay R2: Inactive (not assigned)
• Analog output AO1: 0-20 mA, inactive (not assigned)
If the above values are compatible with the application, the drive can be used without changing the settings.
MRO Drives has all Altivar 71 VFD series drives available. For more information or to request a quote, please call 800-691-8511 or email sales@mrodrives.com