6 Unidrive M702 / HS72 Control Getting Started Guide
Issue Number: 4
2Introduction
This guide covers the M702 and HS72 products.
The M702 drive is limited to 550 Hz; the HS72 drive is a high speed drive for applications above
550 Hz.
Universal AC and servo drive
This product delivers maximum machine performance.
• Universal high performance open and closed loop control for induction, servo, permanent
magnet and linear motors
• Automation and motion option module for direct migration of SyPTPro / SM-Applications
programs
• Onboard IEC 61131-3 programmable automation and motion control
• Flexibility with speed and position measurement, supporting multiple devices and all common
interfaces
• NV Media Card for parameter copying and data storage
• Ethernet fieldbus communications
• Dual channel Safe Torque Off (STO) input
Optional features
• Select up to three option modules including programmable automation and motion control.
2.1 Operating modes
The drive is designed to operate in any of the following modes:
1. Open loop mode
Open loop vector mode
Fixed V/F mode (V/Hz)
Quadratic V/F mode (V/Hz)
2. RFC - A
With position feedback sensor
Without position feedback sensor (Sensorless)
3. RFC - S
With position feedback sensor
Without position feedback sensor (Sensorless)
2.1.1 Open loop mode
The drive applies power to the motor at frequencies varied by the user. The motor speed is a result of
the output frequency of the drive and slip due to the mechanical load. The drive can improve the
speed control of the motor by applying slip compensation. The performance at low speed depends
on whether V/F mode or open loop vector mode is selected.
Open loop vector mode
The voltage applied to the motor is directly proportional to the frequency except at low speed where
the drive uses motor parameters to apply the correct voltage to keep the flux constant under varying
load conditions.
Typically 100 % torque is available down to 1 Hz for a 50 Hz motor.
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