vacon • 154
Parameters
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7.2.7
Ramps And Brakes
P3.4.1.2 A
CCEL
T
IME
1
Ramp time, referred to variation from zero frequency to max frequency.
A specific acceleration time from zero to minimum frequency is available (P2.9).
Normal acceleration time (P1.3) is active only in case power is from mains supply.
P3.4.1.3 D
ECEL
T
IME
1
Ramp time, referred to variation from max frequency to zero.
Normal deceleration time (P3.4.1.3) is active in mains supply and in case the external frequency ref-
erence is lowered below the reference of maximum power. It is also active when start command
falls and ramping stop is programmed (stop mode is anyway by coasting, when the output frequency
is below minimum).
Specific acceleration and deceleration time are used during power regulation. They are available as
parameters in MPPT group, but it is suggested not to change them, unless needed because of sta-
bility issues.
P3.4.1.4
S
TART
ACCELERATION
TIME
A specific acceleration time from zero to minimum frequency is available (P3.4.1.4). Normal accel-
eration time (P3.4.1.3) is active only in case power is from mains supply. Normal deceleration time
(P3.4.1.4) is active in mains supply and in case the external frequency reference is lowered below
the reference of maximum power. It is also active when start command falls and ramping stop is
programmed (stop mode is anyway by coasting, when the output frequency is below minimum).
Specific acceleration and deceleration time are used when power is from solar panels. They are
available as parameters in MPPT group, but it is suggested not to change them, unless needed be-
cause of stability issues.
