Omron Q2A Series Technical Manual page 25

• Motor loss increases during overexcitation braking and high-slip braking. Use a maximum braking frequency of 5% ED and a
maximum braking time of 90 seconds. After you start high-slip braking, you cannot restart the motor until it stops. Use
overexcitation braking to decelerate over a shorter time at a pre-determined speed.
• Acceleration and deceleration have priority over torque limits in Open Loop Vector Control during acceleration and deceleration
(soft start changes). The drive will not operate until the speed is at the minimum frequency or the reverse direction of motor
rotation when the motor speed decreases because of torque limits during constant speed control. Set L7-07 = 2 [TrqLimit@Acc/
Decel= [I-ctrl@Ac/Dec] to enable torque limits during acceleration/deceleration (for winding applications).
*3 Do not use this function with hoist application.
Table 1.6 OLV/PM, AOLV/PM, CLV/PM and EZOLV Features and Advantages of Control Methods
PM Open Loop Vector
Control Method
Control
Selection
(OLV/PM)
Controlled
Motor
Parameter Settings A1-02 = 5
PM Open Loop Vector
Basic Control Control (no speed
controller)
• General-purpose variable
speed control for PM
motors
• Applications in which a
Main Applications
high level of
responsiveness and
accurate speed control
are not necessary.
PG Option Card Not necessary
Maximum Output
590 Hz
Frequency
Speed Control
1:20 AM
Range
Starting Torque 100% / 5% speed
Stationary, Stator
*5
Auto-Tuning
Resistance, Rotational
*5
Torque Limits No
*5
Torque Control No
*5
Droop Control No
Zero Servo
No
*5
Control
*5
Speed Search Yes
Automatic Energy-
No
*5
saving Control
High Slip Braking No (induction motor-
(HSB) specific function)
Feed Forward
No
*5
Control
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
PM Advanced Open PM Closed Loop Vector
Loop Vector Control
(AOLV/PM) (CLV/PM)
PM Motor
A1-02 = 6 A1-02 = 7
PM Open Loop Current PM Closed Loop Current
Vector Control (with speed Vector Control (with speed
controller) controller)
• General-purpose variable
speed control for IPM Very high-performance PM
motors motor control with motor
encoders
• Applications in which
high-precision speed Example: Torque control
control and torque limits and torque limits
are necessary.
Not necessary Necessary (PG-X3)
400 Hz 400 Hz
1:20 AM
1:1500
*1 *2 *3
1:100
100% / 5% speed
200% / 0 min
-1 *1
200% / 0 min
Stationary, Stator
Stationary, Stator
Resistance, Z-phase,
Resistance, Rotational
Rotational
Yes Yes
*6
Yes Yes
No Yes
No Yes
Yes Yes
Yes (IPM motors only) Yes (IPM motors only)
No (induction motor- No (induction motor-
specific function) specific function)
Yes Yes
1.2 Features and Advantages of Control Methods
EZ Open Loop Vector
Control Control
(EZOLV)
Induction Motors/PM
Motors/SynRM
(Synchronous
Reluctance Motors)
A1-02 = 8
Open Loop Current Vector
Control
Low-speed torque
applications
Example: Fans and pumps
Not necessary
120 Hz
1:100
-1 *4
100% / 1% speed
Line-to-Line Resistance
Yes
No
No
No
Yes (Although NOT
operation in the reverse
direction of the Run
command)
Yes
No
No
Notes
-
-
-
-
-
-
This is the range of variable
control.
When you connect and operate
motors in this mode, think about
the increase in motor temperature.
This is the motor torque that the
drive can supply at low speed
during start-up and the related
output frequency (rotation speed).
You must think about drive
capacity when a large quantity of
torque is necessary at low speed.
Automatically tunes electrical
motor parameters.
Controls maximum motor torque to
prevent damage to machines and
loads.
Directly controls motor torque to
control tension and other
parameters.
Sets load torque slip for motors.
Distributes motor loads.
Locks servos without an external
position controller to prevent
movement caused by external
force.
Immediately estimates (or detects)
motor speed and direction when
coasting to a stop to quickly start-
up the drive without stopping the
motor.
Automatically adjusts the voltage
applied to motors to maximize
motor efficiency for all load sizes.
Increases motor loss to let the
motor decelerate faster than usual
without a braking resistor. Motor
characteristics have an effect on
this function.
Compensates effects of the system
inertia to increase the speed
precision when the load changes.
25
1