Reactive Current; Overriding Current Limit; Overload Accumulator; Percentage Load - Control Techniques unidrive sp Advanced User's Manual

Parameter Keypad and Parameter
structure display x.00
The thermal protection system can be used in regen mode to protect the input inductors. The rated current (Pr 5.07) should be set to the rated current
for the inductors. The thermal model temperature accumulator is reset to zero at power-up and accumulates the temperature of the motor whilst the
drive remains powered-up. Each time Pr 11.45 is changed to select a new motor, or the rated current defined by Pr 5.07 or Pr 21.07 (depending on
the motor selected) is altered, the accumulator is reset to zero.
4.17

Reactive current

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate 4ms write
The drive reactive current is shown in this parameter for all modes.
4.18

Overriding current limit

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate Background write
The current limit applied at any time depends on whether the drive is motoring or regenerating and also on the level of the symmetrical current limit.
Pr 4.18 gives the limit level that applies at any instant.
4.19

Overload accumulator

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate Background write
See Pr 4.16 on page 97.
4.20

Percentage load

Drive modes Open-loop, Closed-loop vector,
Bit SP
Coding
Open-loop, Closed-loop vector, Servo
Range
Regen
Update rate Background write
Open-loop, Closed-loop vector, Servo
This parameter displays the actual torque producing current (Pr 4.02) as a percentage of rated active current. Positive values indicate motoring and
negative values indicate regenerating.
Regen
This parameter displays the active current (Pr 4.02) as a percentage of the rated current (Pr 5.07 or Pr 21.07). Positive values indicate power flow
from the supply and negative values indicate power into the supply
4.22 Inertia compensation enable
Drive modes Closed-loop vector, Servo
Bit SP
Coding
1
Default Closed-loop vector, Servo
Update rate Background read
If this parameter is set to one, the drive calculates a torque reference from the motor and load inertia (Pr 3.18) and the rate of change of speed
reference. The torque reference is added to the speed controller output to provide inertia compensation. This can be used in speed or torque control
Unidrive SP Advanced User Guide
Issue Number: 7
Parameter Advanced parameter
description format descriptions
FI DE Txt VM DP ND
1 1 2 1
±DRIVE_CURRENT_MAX A
FI DE Txt VM DP ND
1 1 1
0 to TORQUE_PROD_CURRENT_MAX %
FI DE Txt VM DP ND
1 1
0 to 100.0 %
Servo, Regen
FI DE Txt VM DP ND
1 1 1 1
±USER_CURRENT_MAX %
FI DE Txt VM DP ND
0
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Serial comms
Macros
protocol
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Electronic Feature look-
Performance
nameplate up table
PS
PS
1
PS
1
PS
PS
Menu 4
99