Dc Link Voltage Limitation By "Ramp Hold" P0150 = 0 Or 2 - WEG CFW501 V1.8X Programming Manual

Functions Common to all the Control Modes

11.2.1 DC Link Voltage Limitation by "Ramp Hold" P0150 = 0 or 2

It has effect during deceleration only.
„
Actuation: when the DC link voltage reaches the level set in P0151, a command is set to the "ramp" block,
„
which inhibits the motor speed variation according to
9-2 of chapter 9 V/f SCALAR CONTROL on page 9-1
chapter 10 V V W VECTOR CONTROL on page
Use recommended in the drive of loads with high moment of inertia referred to the motor shaft or loads that
„
require short deceleration ramps.
11.2.2 DC Link Voltage Limitation by "Accelerate Ramp" P0150 = 1 or 3
It has effect in any situation, regardless the motor speed condition: accelerating, decelerating or constant speed.
„
Actuation: the DC link voltage is measured (P0004) and compared to the value set in P0151; the difference
„
between those signals (error) is multiplied by the proportional gain (P0152); the result is then added to the
ramp output, as per
or P0152 = 3) on page 11-6
Ramp (P0152 = 1 or P0152 = 3) on page
Use recommended in the drive of loads that require braking torques at constant speed situation in the inverter
„
output. For example, drive of loads with eccentric shaft as in sucker rod pumps; another application is the load
handling with balance like in the translation in overhead cranes.
NOTE!
When using rheostatic braking, the function "Ramp Hold" or "Accelerate Ramp" must be disabled.
Refer to description of P0151.
P0150 – Ud Controller Type and Current Limitation
Adjustable
Range:
11
Properties:
Access groups
via HMI:
Description:
P0150 configures the behavior of the ramp for the limitation functions of the DC link voltage and current limitation.
In those cases, the ramp ignores the reference and takes an action of accelerating (accel), decelerating (decel)
or freezing (freeze) the normal path of the ramp. That occurs because of the limit pre-defined in P0151 and
P0135 for the DC link (Ud) limitation and for current (LC) limitation, respectively.
11-4 | CFW501
Figure 11.4: Block diagram of DC link voltage limitation – Accelerate Ramp (P0152 = 1
and Figure 11.5: Example graph of the DC ling voltage limitation – Accelerate
11-7.
0 = hold_Ud and decel_LC
1 = acel_Ud and decel_LC
2 = hold_Ud and hold_LC
3 = acel_Ud and hold_LC
cfg, V/f, V V W
MOTOR
Figure 9.1: Block diagram of V/f scale control on page
and Figure 10.1: VVW control flow on page 10-2
10-1.
of
Factory
0
Setting: