Using The Dc Injection Brake; Motor Pre-Heat Function - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

Using the DC Injection Brake

Set constant b2-03 to apply DC injection to the motor, before it starts to accelerate. Applying DC injection at
start will stop the motor before starting if it was coasting through inertia or wind mill effect.
Set b2-03 to 0 to disable the DC injection brake at start.
Set constant b2-04 to apply a DC injection brake to the motor at stopping. It prevents the motor from coasting
when it would not be stopped completely using the normal deceleration. This can occur if the inertia is very
high. The DC injection brake can be disabled by setting b2-04 to 0.
Set the DC injection brake current using b2-02.
Related Constants
Con-
stant
Number
DC injection braking starting fre-
b2-01
quency
b2-02 DC injection braking current
b2-03 DC injection braking time at start
b2-04 DC injection braking time at stop

Motor Pre-heat Function

The motor pre-heat function can be used to prevent e.g. moisture inside the motor due to condensation. The
pre-heat current can be set in b2-09. Using a digital input which is set for motor pre-heat (H1-
function can be enabled or disabled.
Related Constants
Con-
stant
Number
b2-09 Motor pre-heat current
Multi-function Digital Inputs (H1-01 to H1-05)
Set value
60
-14
6
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Name
Used to set the frequency at which DC injection braking
starts in units of Hz when b1-03 is set to 0 (deceleration to
stop).
When b2-01 is less than E1-09, E1-09 becomes the DC
injection braking starting frequency.
Set the DC Injection Braking Current as a percentage of
the Inverter rated current.
Used to set the time to perform DC injection braking at
start.
Used to stop coasting motor and restart it. When the set
value is 0, DC injection braking at start is not performed.
Used to set the time to perform DC injection braking at
stop in units of 1 second. Used to prevent coasting after
the stop command is input. When the set value is 0.00, DC
injection braking at stop is not performed.
Name
Sets the DC current level when the motor pre-heat function
is enabled using a digital input.
Motor pre-heat command
Setting
Description
Range
0.0 to
10.00
0.00 to
Setting
Description
Range
0 to 100
Function
Change
Factory during Access
Setting Opera- Level
tion
0.5 Hz No A
10.0
0 to
50% No A
100
0.00
to 0.00 s No A
0.50 s No A
10.0
=60) the
Change
Factory during Access
Setting Opera- Level
tion
0% No A