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14
SmartCard
Internal Dynamic Braking Resistors
During deceleration, the kinetic energy stored in the
spinning mass of the motor/load combination is converted
to electrical energy which recharges the drive’s DC bus.
Dynamic braking resistors provide a means of rapidly
dissipating that energy so that the drive does not fault from
the DC bus over voltage trip. The Ohmic value and power
rating of the braking resistor is a function of the drive type,
size and duty cycle of the application.
A zero-space braking resistor is available for heatsink
mounting on Unidrive SP frame sizes 0 to 2. These resistors
are designed for low-inertia loads commonly used in servo
type applications. For higher inertia loads, the heatsink-
mounted resistor may not have enough braking capacity
and a larger external resistor may be required. No additional
thermal protection device is required with these heatsink-
mounted resistor packages.
Frame
Size
DC
Resistance
Power
Rating Order Code
0 70Ω 50W SM-HEATSINK-DBR0
1 75Ω 50W SM-HEATSINK-DBR1
2 37.5Ω 100W SM-HEATSINK-DBR2
(Drives larger than Size 2 do not have this option.)
Standard Features
Unidrive SP-Compatible Encoders
Encoder Type
Quadrature incremental encoders with or without marker pulse
Quadrature incremental encoders with UVW commutation signals for
permanent magnet motors with or without marker pulse
Forward / reverse incremental encoders with or without marker pulse
Forward / reverse incremental encoders with UVW commutation signals
for permanent magnet motors with or without marker pulse
Frequency and direction incremental encoders with or without marker
pulse
Frequency and direction incremental encoders with UVW commutation
signals for permanent magnet motors with or without marker pulse
SinCos incremental encoders
Heidenhain sin/cos encoders with Endat comms for absolute position
Stegmann sin/cos encoders with Hiperface comms for absolute position
SinCos encoders with SSI comms for absolute position
SSI encoders (gray code or binary)
Endat comms only encoders
UVW commutation only encoders*
* This feedback device provides very low resolution feedback and should not be used for
applications requiring a high level of performance
The SmartCard is a memory device that is supplied with
every Unidrive SP and can be used to back-up parameter sets
and PLC programs and copy them from one drive to another.
• Parameter and program storage
• Simplify drive maintenance and commissioning
• Quick set-up for sequential build of machines
• Machine upgrades can be stored on a SmartCard and sent
to the customer for installation