142 01-6203-01R3, CG Drives & Automation
7.3.1. V/f voltage boost
The parameterisable voltage boost makes it possible to improve the starting performance
for applications requiring a high starting torque.
Preconditions
The function is only effective in the motor control type "V/f characteristic control (VFC
open loop)".
Details
• In 0x2B12:001 (P316.01), a permanent voltage boost can be set.
①
• In 0x2B12:002 (P316.02), an additional voltage boost can be set for acceleration
processes only.
②
• Reference for the percentage setting of the voltage boost is the base voltage
0x2B01:001 (P303.01).
Name / value range / [default setting]
(P316.01)
(Fixed V/f boost)
0.0 ... [2.5]* ... 20.0 %
* Default setting depending on the size.
Fixed (constant) voltage boost for V/f characteristic control without
feedback.
•
100 % ≡ V/f base voltage 0x2B01:001 (P303.01)
•
For the purpose of optimising the starting performance for
applica
tions requiring a high starting torque.
(P316.02)
V/f voltage boost: Boost at acceleration
(V/f boosts: Dynam. V/f boost)
0.0 ... [0.0] ... 20.0 %
Additional voltage boost for V/f characteristic control without feedback.
•
100 % ≡ V/f base voltage 0x2B01:001 (P303.01)
•
This voltage boost is only active while the motor is accelerated. It then
acts in addition to the fixed voltage boost set in 0x2B12:001
0x2B01:001
(P303.01)
V/f shape data: Base voltage
(V/f shape data: Base voltage)
0 ... [230]* ... 5000 V
* Default setting depending on the size.
Base voltage and base frequency define the V/f ratio and thus the
gradient of the V/f characteristic.
•
The V/f base voltage is usually set to the rated motor voltage
0x2C01:007 (P320.07).
•
The V/f base frequency is usually set to the rated motor frequency
0x2C01:005 (P320.05).
0x2B01:002
(P303.02)
V/f shape data: Base frequency
(V/f shape data: Base frequency)
Device for 50-Hz mains: 0 ... [50]* ... 1500 Hz
Device for 60-Hz mains: 0 ... [60]* ... 1500 Hz
•
* Default setting depending on the size.
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