Regenerative Current Limit; Torque Stabilisation Gain; Software Option Functions - GE VAT2000 Instruction Manual

B18-1

Regenerative current limit

The regenerative torque to deceleration running is limited. Set to 10% when not using the
DBR option. When using the DBR option, calculate the value with the following formula and
set.
B18-1 setting value =
B18-2

Torque stabilisation gain

This function suppresses the hunting phenomenon that causes the current to abnormally
vibrate during motor operation.
Normally, the specified value (1.00) is set, and the setting value is increased appropriately
according to the hunting.
Note that the hunting phenomenon occurs easily in the following cases.
• During a light load or no load
• When the system inertia is low
• When the motor's secondary time constant is high (high-efficiency motor)
• When carrier frequency is high
(Note)
B35-0 Demagnetising control operating voltage
B35-1
Demagnetising current limit value
B35-2 Demagnetising current control proportional gain
B35-3
Demagnetising current control integral time constant
B35-4 Flux temperature compensation range
B35-5 Flux temperature compensation time constant
B36-0 to Demagnetising current table 0 to 4
4
All these above mentioned parameters are related to PM Motor control. Please check the
manual PCST3307 of the optional encoder interface for PM motors, type U2KV23DN3.
B40-0~1

Software option functions

The program ramps, pattern operation, traverse, PID and multi-pump functions can be
selected with parameters B40-0 and B40-1, as shown below. (use only one at a time)
B40-0 = 1: All software functions are disabled
B40-1 = 1: All software functions are disabled
6. Control Functions and Parameter Settings
[ (
DBR resistance value
where V2=148.2 for the 200V system and V2=593 for the 400V system.
The hunting phenomenon at a frequency exceeding 66Hz cannot be suppressed.
2: Program ramp function (B41-0 to B42-7)
3: Pattern run function
4: Traverse function
2: PID
3: Multipump
V2
)
/ Motor capacity [kW]
(B50-0 to B59-3)
(B45-0 to B45-6)
(B43-0 to B43-4)
(B43-0 to B44-3)
6-46
]
× 100 [%]