Nidec Unidrive M600 Series - Page 165

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Unidrive M Regen Design Guide 165
Issue Number: 4
where:
I
Rated
= Rated Current (05.007)
A maximum is applied to the reactive current reference parameter so that the combined current reference for the active and reactive currents does
not exceed I
MaxRef
.
VM_REGEN_REACTIVE = (VM_MOTOR1_CURRENT_LIMIT² – I
Limit
²)
where
I
Limit
is gives the highest level of the active current reference that can occur. This value is defined by the current limit values. If the current limits are all
set to their maximum values (i.e. VM_MOTOR1_CURRENT_LIMIT) then there is no current capability left for the reactive current. However, if the
current limits are reduced the resulting headroom can be used for the reactive current. I
Limit
is defined by a combination of all the current limits
excluding any reduction of the current limit due to the motor thermal model, It should be noted that if Island Detection Enable (03.030) = 1 then
VM_REGEN_REACTIVE is reduced by 5 % to allow for the islanding system injection current.
Figure 9-2 Menu 4 Regen logic diagram
Regen mode
Current
measurement
04.001
Current Magnitude
04.002
Active Current
04.017
Reactive Current
04.020
Percentage Load
Inductor Overload Protection
Inductor Thermal Time Constant (04.015)
Inductor Protection Accumulator (04.019)
Inductor Protection Accumulator Power-up Value (04.036)
Maximum Heavy Duty Rating (11.032)
Current Feedback Filter Disable (04.021)
User Current Maximum Scaling (04.024)
Current Limits
Power From Supply Current Limit (04.005)
Power To Supply Current Limit (04.006)
Symmetrical Current Limit (04.007)
04.018
Final Current
Limit
10.017
Inductor Overload
Alarm
04.004
Final Active
Current Reference
-
+
Current Controller
Kp Gain (04.013)
Current Controller
Ki Gain (04.014)
Current Controller
Kp Gain (04.013)
Current Controller
Ki Gain (04.014)
-
+
Active Axis
Voltage
Reference
Reactive
Axis Voltage
Reference
Reactive current
reference from
Menu 3
Active current
reference from
Menu 3
Active Current
Reference
(04.009)
0
1
Active Current
Reference Selector
(04.010)
04.040
Final Reactive
Current Reference
04.018
Final Current
Limit