Omron SYSDRIVE RV Series User Manual page 419

Time Chart
Lifting
•
The analog signals corresponding to the load size are input as torque compensation signals from before the
Inverter starts until operation stops. (Factory setting: 10 V/100% torque)
Positive polarity is input for motor loads and negative polarity is input for regenerative loads.
The following diagram shows the time chart for lifting.
UP (Forward)
HIGH/LOW
Torque compensation
signal: 0
Output frequency
0
Motor torque
0
During run 2
Holding brake operation
Fig 6.100 Torque Compensation Time Chart (Lifting)
Lowering
•
In the same way as for lifting, when the torque decreases, the analog signals corresponding to the load size are
input as torque compensation signals from before the Inverter starts until operation stops. (Factory setting: 10
V/100% torque)
Negative polarity is input for motor loads and positive polarity is input for regenerative loads.
The following diagram shows the time chart for lowering.
DOWN (Forward)
HIGH/LOW
Torque compensation
signal: 0
0
Output frequency
Motor torque
0
During run 2
Holding brake operation
Fig 6.101 Torque Compensation Time Chart (Lowering)
1. For either increasing or decreasing torque, externally maintain the torque compensation signals during
operation to prevent them from fluctuating. Fluctuation in compensation signals during operation may result
in vibration.
2. If reverse run is used for lifting and forward run is used for lowering, the torque compensation signal polar-
IMPORTANT
ity must be reversed.
OFF
ON
OFF
ON
Analog signals corresponding to load size
Same as above
Zero-speed control
OFF
ON
OPEN
CLOSE
OFF
ON
OFF
ON
Analog signals corresponding to load size
Same as above
OFF
ON
OPEN
CLOSE
Using Inverters for Elevating Machines
(Motor load: Inputs positive polarity.)
(Regenerative load: Inputs negative polarity.)
t
(Motor load)
(Regenerative load)
(Regenerative load: Inputs positive polarity.)
(Motor load: Inputs negative polarity.)
t
(Regenerative load)
(Motor load)
211
6-