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| Vari
Speed® R400 Series |
| |
| Vari
Speed® R400 speed/torque control for 1/4 to 2 HP DC motors |
The
Vari Speed® R400 is a full-wave DC regenerative control that provides
high performance four quadrant speed and torque control. The R400
solid state controller converts single phase AC line power into an
adjustable DC power to control 1/4 to 2 horsepower DC motors.
The R400's flexible design is easily selectable for speed or torque
mode, tachometer voltage, dual voltage and for horsepower size. The
R400 is designed with today's most desirable features including isolated
input signals, status indicators, alarm outputs. When performing frequent
directional changes, the R400 transfers excess system energy back
to the AC line rather than wasting additional energy by the use of
a dynamic brake resistor.
The R400 is designed, engineered and manufactured in the USA, and
is UL and cUL listed. |
|
| Features |
Applications |
- Excellent
regulation performance
- Fast acting
current limit
- Starts into
a rotating
motor
- 50 or 60
Hz selectable
- Provides
150% load for one minute
- Two and
three-wire start-stop
- Disable
function
- Reversible
|
- Food and
beverages
- Machinery
and material handling
- Packaging
and chemicals
|
| Standard
Product Feature |
Application
Benefit |
| Multiple rated
unit |
One unit can
be used for 120 or 240 VAC operation of 1/4 to 2 HP PM or wound field
DC motors |
| Regenerative
control |
Allows 4-quadrant
operation to maintain complete control of motor and load |
| Speed or torque
control |
Provides proper
motor control for application requirements |
| Excellent regulation
performance |
Improves overall
system operation |
| Fast acting current
limit |
Can quickly react
and compensate to load changes |
| 2- or 3-wire
start/stop |
Provides flexibility
in system logic |
| Isolated logic
inputs |
Easy connection
of peripheral equipment |
| Alarm output |
Provides remote
indication of an undesirable situation |
| Status indicators |
Visual indication
of primary control status |
| 150% load capabilities |
Extra power for
intermittent overloads |
| Reversible |
Contact closure or + or - 10VDC for motor shaft rotation reversing |
| Regenerative
(Four-Quadrant) Control |
Regenerative DC drives are able to provide complete control of a DC
motor's speed and torque simultaneously. A regenerative drive has
the capability of producing torque in either braking or motoring modes,
while operating a motor's speed in a consistent direction of rotation.
The capability to provide braking torque is a result of the drive's
ability to operate in all for quadrants of the motor's speed/torque
curve.
A four-quad DC drive's ability to operate in a regenerative mode is
primarily provided by the additional power section included in the
design. Four additional SCR devices are utilized in comparison to
a standard NEMA Code K-type converter. These four additional components
allow for the complete control of both the voltage and current flow
to the armature of the DC motor, thus controlling both the speed and
torque.. |
|
Quadrant
I
Forward motor rotation;
forward torque: |
Quadrant
III
Reverse motor rotation;
reverse torque: |
| When
the elevator is accelerating in an upward direction, the torque and
speed are in the same direction. |
When
the elevator is accelerating (faster then the gravity) in the downward
direction, the torque and speed are in the same direction. |
Quadrant
II
Reverse motor rotation;
forward torque:
|
Quadrant
IV
Forward motor rotation;
reverse torque: |
| When
the elevator is decelerating in a downward direction, the speed of
the elevator is also going downward, but the torque is in the opposite
direction and is braking the speed of the elevator. The motion energy
from the elevator. motor and gravity are being regenerated back to
the power line. |
When
the elevator is decelerating in an upward direction, the speed of
the elevator is still going upward the torque is in the opposite direction
and is braking the speed of the elevator. The motion energy from the
elevator and motor are being regenerated back to the power line. |
| Selection |
| Description |
Part
Number |
120
or 240 VAC selectable
120 or 240 VAC selectable, with field supply
120 or 240 VAC selectable, 1/100 - 1/20 hp |
176B4000
176B4001
176B8013 |
| |
| Specifications |
| Control
Parameters |
Specification |
Factory
Setting |
Input
Power
Line Voltage (1Ø) VAC ±10%
Line Frequency (Hz)
|
120 or 240
50 or 60
|
240
60
|
PLC or Process Input
Follow Voltage (VDC)
Speed and Torque Potentiometer (Kohm, 1/4 W)
Remote Two or Three Wire Start-Stop
Tachometer @ 1,000 RPM (VDC)
|
±10
2.5
On/Off
7 or 20.8
|
—
—
|
Output
Armature Current Max (Amps, DC)
Motor Rating at 120 VAC (HP)
Motor Rating at 240 VAC (HP)
Armature Voltage at 120 VAC (VDC)
Armature Voltage at 240 VAC (VDC)
Field Voltage at 120 VAC (VDC)**
Field Voltage at 240 VAC (VDC)**
Field Current at 120 VAC (Amps)**
Field Current at 240 VAC (Amps)**
Service Factor
Overload for One Minute (%)
Start/Stops per Minute (Max) @ Full Load1
@ Speed Change 100%
|
10.8
(2.0)
1/4 - 1 (1/30 - 1/8)
1/4 - 2 (1/30 - 1/8)
0 ±100
0 ±200
100
200
1 (nominal)
1 (nominal)
1.0
150
30
±12 |
|
Adjustments
Forward Acceleration Rate (sec)
Reverse Acceleration Rate (sec)
Minimum Speed/Torque (%)
Maximum Speed/Torque (%)
Forward Current Limit (%)
Reverse Current Limit (%)
IR Compensation (%)
Dynamic of Loop Regulation
|
0.15 - 8
0.15 - 8
0 - 50
50 - 110
0 - 150
0 - 150
0 - 25
—
|
4
4
0
100
100
100
12
50%
|
1
Reflected inertia 10.7 lb.in.2 at 1HP motor (55°C ambient
temperature).
* ( ) For 176B8013
** 176B4001 only |
| Operating
Overload
The drives
ability to withstand currents beyond its rating. Normally expressed
iin a percentage of full-load nominal current for a specified
time.
Phase
Control
The process
on a DC drive of varying the point within the AC cycle to allow
forward conduction through the SCR's. This is expressed as either
the reduction in DC voltage or the angle of retard or advance.
Process
Signal
A controlling
input to the drive from a transducer providing a current or voltage
reference to command a motor speed proportional to the signal
output.
Regenerative
(Four-Quadrant) Control
Regenerative
DC drives are able to provide complete control of a DC monitor's
speed and torque simultaneously. A regenerative drive has the
capability of producing torque in either operating a motor's speed
in a consistent direction of rotation. The capability to provide
braking torque is a result of the drive's ability to operate in
all four quadrants of the motor's speed/torque curve.
Regulation
The amount
of speed change from no-load to full-load conditions stated in
a precentage of no-load speed.
Reversing
A technique
to reverse motor shaft rotation by use of magnetic contractors
or solid state devices reversing the DC polarity of the motor
amrature or field.
SCR
(Sacon Controlled Rectifier)
A semiconductor
device used to control motor power. A common application is their
use for adjustable speed drives for PMDC motors.
Speed
Adjustment Potentiometer
A three-terminal
resistor with a sliding contact used as an adjustable voltage
divider for commanding the motor speed or motor torque.
|
Speed
Range
The ratio
of the minimum and maximum speed where the published regulation
is in effect, i.e. with a speed range of 50:1 and an 1800 RPM
motor, the motor can maintain 36 RPM at constant torque and regulation.
Slave
(Follower) Drive
A drive or
drives connected in series of parallel to a master drive. The
follower(s) respond in proportion maintaining the speed ratios
when the master control calls for a speed change.
Speed
Mode
Mode of operation
on a DC drive where the input command, by a process signal or
potentiiometer controls the motor speed output.
Torque
Mode
Mode of operation
on a DC drive where the input command, by a process signal or
potentiometer, controls the motor torque output.
Transient
Protection
Protection
from the tansients that affect the performance or life of a motor
drive system. Typical protection devices consist of transformers,
surge supressors, MOV's, and RC filter networks.
Wiring
Diagram
A diagram
which locates and identifies electrical devices, terminals and
interconnecting wiring in an assembly.
Load
Definitions
Acceleration
The change
in velocity as a function of time. This is commonly a positive
rate at which the load travels from a lower to a higher speed.
Cycle
Rate
A measure
of total machine movement time plus any dwell time. Typically
measured in cycles/minute.
Deceleration
The change
in velocity as a function of time. Expressed as a negative rate
at which the load travels from a higher to lower speed.
|
Horse
Power
Work done.
The product of torque and speed divided by a constant:
|
HP
= Speed (RPM) x Torque (ft.lb.)
-----------------------------------------
5250 |
Inertia
The property
of an object to resist changes in velocity unless acted upon by
an outside force. The greater the inertia, the more torque required
to accelerate the load. Inertia calculations are based on the
mass and shape of the object.
Overhauling
Loads
A load that,
under certain conditions, will actually move faster then the motor.
This normally causes the motor to turn freely and is considered
unacceptable.
Torque
The turning
or twisting effort produced at the shaft of the motor. The torque
is directly proportional to the force exerted on the rotor (magnetic
repulsion) and the radial distance through which the forces act.
Torque is usually measured in ft. lbs. Matematically, torque (T)
is equal to the product of force (F) trying to produce rotation
times the distance from the center of rotation to the point of
application of the force (radius R) such that.
T = F x R
Torque can exist even if there is no rotation. If there is no
rotation, no work can be performed; yet there can exist a torque
trying to produce rotation.
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| Vari Speed
R400 Dimensions |
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| Regenerative Control Power Section |
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