Omron VARISPEED L7 User Manual

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 Adjusting the DC Injection Current
The DC current injection is used in V/f and Open Loop Vector Control in order to hold the motor when the
brake is opened or closed.
Related Parameters
 Adjusting the DC Injection Current Levels (S1-02/03)
Two different DC injection current levels can be set to start and stop.
• Increase the corresponding set value when the holding torque during brake open or brake close is too low.
• Decrease the corresponding set value when the holding torque is enough but e.g. the DC injection noise is
too loud.
Adjusting the DC Injection Gains for Stop (S1-17/18)
In Open Loop Vector control two different DC injection current gains for motoring and regenerative operation
can be adjusted in order to improve the stopping behavior. The gains are related to the S1-03 set value. The
function can be used to equalize jerk effects if the DC injection is too low with motoring load and too high
with regenerative load. The load condition (regenerative or motoring) is detected when the inverter is running
at another speed than the leveling speed.
• If the DC injection is ok with motoring load but not with regenerative load adjust parameter S1-17.
• If the DC injection is ok with regenerative load but not with motoring load adjust parameter S1-18.
Parameter
No.
Name
Factory
Setting
Change
during
Operation
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
Closed
Loop
Vector
(PM)
S1-02 DC injection current level at start 50% No A A - -
S1-03 DC injection current level at stop 50% No A A - -
S1-17 DC injection gain at stop in regenerative operation 100% No - A - -
S1-18 DC injection gain at stop in motoring operation 20% No - A - -

Omron VARISPEED L7 Specifications

General

Brand	Omron
Model	VARISPEED L7
Category	Inverter
Language	English