Specifications

Altivar
®
31 Adjustable Speed AC Drives
Functions
45
4/2005
© 2004–2005 Schneider Electric All Rights Reserved
Below are the recommended brake control settings for vertical lifting
applications (for a horizontal lifting application, set the current threshold to 0).
• Brake release current: Set the brake release current to the nominal current
indicated on the motor. If torque is insufficient during testing, increase the
brake release current (the drive imposes the maximum value).
• Acceleration time: For lifting applications, set the acceleration ramps to
more than 0.5 s. Ensure that the drive does not change to current limiting.
The same recommendation applies for deceleration.
NOTE: For a lifting movement, a braking resistor must be used. Ensure
that the settings and configurations selected cannot cause a drop or a loss
of control of the lifted load.
• Brake release time delay: This is the time required for the mechanical
brake to release. Adjust according to the type of brake.
• Brake engage frequency: Set to twice the nominal slip, then adjust
based on the result.
• Brake engage time delay: This is the time required for the mechanical
brake to engage. Adjust according to the type of brake.
Limit switch management
This function manages the operation of one or two limit switches (with one or
two rotation directions).
Each limit (forward or reverse) is associated with a logic input. The type of
stop occurring on detection of a limit is configurable as normal, freewheel or
fast.
Following a stop, the motor can restart only in the opposite direction.
Monitoring
The following data can be displayed:
• frequency reference
• internal PI reference
• frequency reference (absolute value)
• output frequency applied to the motor (value signed in two’s complement)
• output value in customer units
• current in the motor
• motor power: 100% = nominal power
• line voltage
• motor thermal state:
100%: nominal thermal state; 118%: motor overload threshold
• drive thermal state:
100%: nominal thermal state; 118%: drive overload threshold
• motor torque: 100% = nominal torque
•last fault
• operating time
• auto-tuning status
• configuration and state of logic inputs
• configuration of analog inputs
Monitoring parameters with PowerSuite software
operation.jpg
Monitoring parameters with the oscilloscope
function in PowerSuite software
scope.jpg
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: [phone]-Outside Local Area: [phone]-www.stevenengineering.com