13
0BB9
08.1
0
Illustration 3.35 RFI Filter
SP-51 DC Link Compensation
Option:
Function:
The rectified AC-DC voltage in the frequency
converter's DC-link is associated with voltage ripples.
These ripples can increase in magnitude with
increased load. These ripples are undesirable because
they can generate current and torque ripples. A
compensation method is used to reduce these voltage
ripples in the DC link. In general, DC-link compen-
sation is recommended for most applications, but pay
attention when operating in field weakening as it can
generate speed oscillations at the motor shaft. In field
weakening, it is recommended to turn DC-link
compensation off.
[0]
*
Off
Disables DC-link compensation. This disables compen-
sation for ripple in the DC bus and may be set when
harmonic filters are used with the drive.
[1]
On
Enables DC-link compensation. This function
compensates for lower or higher DC bus voltages to
recreate a more perfect sine-wave. May overcom-
pensate when harmonic filters are used.
SP-53 Fan Monitor
Option:
Function:
Select the frequency converter action if a fan
fault is detected.
[0]
Disabled
[1]
*
Warning
[2]
Trip
SP-54 AHF Cap Reconnect Delay
Range:
Function:
25 s
*
[1 - 120
s]
Delay time between 2 consecutive AHF
capacitor connections. The timer starts once
the AHF capacitor disconnects, and connects
back once delay expires and frequency
converters power above 20% and below 30%
of nominal power.
AHF capacitor connect output function for digital and
relay outputs
Functional description:
1.
Connect capacitors at 20% nominal power.
2.
Hysteresis
±
50% of the 20% nominal power
(=minimum 10% and maximum 30% nominal
power).
3.
Off delay timer=10 s. The nominal power must be
below 10% for 10 s to disconnect the capacitors.
If the nominal power exceeds 10% during the 10
s delay, the timer (10 s) restarts.
4.
The capacitor reconnect delay (default=25 s with
a range from 1 s to 120 s, see
parameter SP-54 AHF Cap Reconnect Delay
) is used
for the minimum off-time for the AHF capacitor
output function.
5.
In case of power loss, the frequency converter
guarantees that the minimum off-time is satisfied
when power is restored.
Illustration 3.36 Example of the Output Function
t
1
shows the off delay timer (10 s).
t
2
shows the capacitor reconnect delay
(
parameter SP-54 AHF Cap Reconnect Delay
).
When the nominal power of the frequency converter
exceeds 20%, the output function turns on. When the
power goes below 10%, an off delay timer needs to expire
before the output goes low. This is represented by t
1
. After
the output goes low, the capacitor reconnect delay timer
needs to expire before the output is allowed to be on
Parameter Description
AF-600 FP
™
Programming Guide
DET-620D
03/2016 All rights reserved.
79
3
3
