226
5. Parameter Description
Eaton Electric General Inverters DF1 Series
UMXXXXXXXXE February 2020 www.eaton.com
Regeneration and avoidance function
•
Function of regeneration and avoidance: When the regenerative status is serious, the DC bus voltage rises and an
overvoltage alarm OV may occur. The function is to improve the output frequency of inverter and decrease the DC
bus voltage for avoiding alarm OV when overvoltage happens (as the following shows).
5.11.15 Overexcitation deceleration function
•
Overexcitation decelerationincreases the flux during deceleration to increase the motor loss, so that deceleration time
can be decreased without a braking resistor.
Parameter
Name
Factory
Value
Setting Range
Content
10-51
P.264
Overexcitation deceleration
0
0
Overexcitation deceleration is invalid.
1
Overexcitation deceleration is valid.
10-52
P.265
Overexcitation current level
150.0%
0~200.0%
When the output current is above the setting level in
overexcitation deceleration, overexcitation gain will auto-
decrease.
10-53
P.266
Overexcitation gain
1.10
1.00~1.40
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Overexcitation deceleration function
•
Overexcitation deceleration(10-51=1)
Overexcitation control can suppress the increasing of DC bus voltage. The larger overexcitation gain is, the stronger
suppressing effect is.
When the voltage stall occurs in overexcitation deceleration, it is necessary to prolong the deceleration time or
increase the overexcitation gain10-53.
When the current stall occurs in overexcitation deceleration, it is necessary to prolong the deceleration time or
decrease the overexcitation gain 10-53.
ote:
N
1. As regenerative energy is mainly dissipated as heat in the motor, the motor temperature will rise if overexcitation deceleration
is applied frequently.
2. When a run command is entered during overexcitation deceleration, overexcitation operation is cancelled and the drive will
reaccelerate to the specified speed.
3. When PM motor is used, overexcitation deceleration function is invalid.
