
01/08 AWB2190-1430GB
Features of the
Speed Control Unit
85
Features of the Speed Control Unit
The speed control unit RA-SP allows soft starting and operation of
motors at up to four different fixed speeds. RA-SP supplies a linear
torque, even at low speeds. The controlled motor start reduces
mechanical strain as well as power consumption.
With AS-Interface
®
you can select direction enable and three fixed
frequencies (30, 40 and 50 Hz) in AUTO operating mode. In HAND
(manual)mode you can set a speed of 0 to 50 Hz through the
spindle potentiometer (10-turn, under the screw cover on the
device front; default setting
page 114). Enable and operating
direction are defined with the selector switch. The individual
operating states are indicated by LEDs.
Version RA-SP2-… allows direct operation (without
parameterization) of four-pole three-phase asynchronous motors up
to a shaft rating of 0.75, 1.1 or 2.2 kW at 400 V.
For motors with different ratings or a different number of poles,
check and, if necessary, change the parameters.
Engineering
Overview of functions, RA-SP
The speed control unit (RA-SP2-34…) has the following
characteristics:
• Voltage disconnection through decentralized power supply
(RA-DI).
• Protection against reconnection of motor cable during motor
maintenance with Lock shackle SET-M-LOCK (
• Fixed frequencies for up to four independent motor speeds.
• Three digital and one analog fixed frequency.
• Parameterizable operating data (acceleration and deceleration
time, current limitation, etc.)
• Actuation of motors featuring brakes with an external 400 V AC
or 230 V AC power supply.
• Connection of two light barriers, sensors or limit switches
through two M12 sockets.
• Automatic actuation through AS-Interface
®
(start forward
operation, start reverse operation, digital reference frequency
input board).
• The lower section of the enclosure acts as a heat sink.
h
Caution!
The speed control unit must be used only in combination
with this user manual.
h
The speed control unit RA-SP2-340-… is based on the
series DF5-340-… frequency inverters.
The DF5-340-… is a voltage-controlled frequency inverter
with
U
/
f
characteristic control. All functions, parameters
and technical data are described in manual AWB8230-
1412. For RA-SP2-340-… only some of the corresponding
frequency inverter’s functions and parameters can be
used.
h
The speed control unit RA-SPV-HE-340-… is based on the
series DV5-340-… vector frequency inverters.
The DV5-340-… is a frequency inverter with sensorless
vector control and extended functionality compared to the
DF5-340-… (RA-SP2-340-…). All functions, parameters
and technical data are described in manual AWB8230-
1414. For RA-SPV-HE-340-… only some of the
corresponding frequency inverter’s functions and
parameters can be used.
Additional feature of the RA-SPV-… over the RA-SP2-…
is its built-in brake chopper with braking resistor for
dynamic braking.
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