Danfoss VLT AHF 005 Design Manual page 54

Programming
5–13 Terminal 29 Digital Input
Option: Function:
[14] Jog Functions are described in parameter group 5-1*
*
Digital Inputs.
6.1.2 5-3* Digital Outputs
The 2 solid-state digital outputs are common for terminals
27 and 29. Set the I/O function for terminal 27 in
parameter 5-01 Terminal 27 Mode and set the I/O function
for terminal 29 in parameter 5-02 Terminal 29 Mode.
NOTICE
6 6
These parameters cannot be adjusted while the motor is
running.
5-30 Terminal 27 Digital Output
This manual only shows the option relevant for the VLT
Advanced Harmonic Filter AHF 005/AHF 010. Refer to the
frequency converter programming guide for the complete list of
options in this parameter.
Option:
[188] AHF Capacitor
Connect
5-40 Function Relay
This manual only shows the option relevant for the VLT
Advanced Harmonic Filter AHF 005/AHF 010. Refer to the
frequency converter programming guide for the complete list of
options in this parameter.
Option:
[188] AHF Capacitor
Connect
52
®
VLT Advanced Harmonic Filter AHF 005/AHF 010
®
Function:
NOTICE
This function is not suitable when
multiple frequency converters are
connected to a single filter.
The capacitors are turned on at 20%
(hysteresis of 50% gives an interval of
10–30%). The capacitors are discon-
nected below 10%. The off delay is 10 s
and restarts if the nominal power goes
above 10% during the delay.
Parameter 5-80 AHF Cap Reconnect Delay
is used to guarantee a minimum off-
time for the capacitors.
®
Function:
NOTICE
This function is not suitable when
multiple frequency converters are
connected to a single filter.
The capacitors are turned on at 20%
(hysteresis of 50% gives an interval of
10–30%). The capacitors are discon-
nected below 10%. The off delay is 10 s
and restarts if the nominal power goes
above 10% during the delay.
Parameter 5-80 AHF Cap Reconnect Delay
Danfoss A/S © 10/2016 All rights reserved.
5-40 Function Relay
This manual only shows the option relevant for the VLT
Advanced Harmonic Filter AHF 005/AHF 010. Refer to the
frequency converter programming guide for the complete list of
options in this parameter.
Option: Function:
is used to guarantee a minimum off-
time for the capacitors.
5-80 AHF Cap Reconnect Delay
Range: Function:
25 s [1 - 120 Guarantees a minimum off-time for the
*
s] capacitors. The timer starts once the AHF
capacitor disconnects and has to expire before
the output is allowed to be on again. It only
turns on again if the frequency converter
power is 20–30%.
6.1.3 DC-link Compensation Disabling
NOTICE
To prevent resonances in the DC link, disable the
dynamic DC-link compensation by setting
parameter 14-51 DC-Link Compensation to [0] Off.
The FC series includes a feature which ensures that the
output voltage is independent of any voltage fluctuation in
the DC link, for example caused by fast fluctuation in the
mains supply voltage. Sometimes, this dynamic compen-
sation can produce resonances in the DC link and should
then be disabled. Typical cases are where VLT
Harmonic Filter AHF 005/AHF 010 is used on supply grids
with high short circuit ratio. Fluctuations can often be
recognized by increased acoustic noise and, in extreme
cases, by unintended tripping.
14-51 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 compensation 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, turn off DC-link
compensation.
[0] Off Disables DC-link compensation.
[1] On Enables DC-link compensation.
®
®
Advanced
MG80C502