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8.3 VFD – Advanced Setup
Group
FD-4: Auto Bypass
Auto Bypass
4) Disabled
0 - Disabled
1 - On VFD Fault
2 - Bypass Comm Loss
3 - VFD Fault & Bypass
Comm Loss
Default: Disabled
Ifset to“OnVFDFault”andVFD trips,theVFD
bypasswillstartifruncommandispresent.Ifset
to“BypassCommLoss”andVFDcommunication
isnotpresent,thebypasswillstart.Ifsettoboth,
bypass starts when either VFD‐Bypass comms
arelostorVFDisinFaultmode.
FD-6: Damper Control
Damper Control
6) Disabled
0 - Disabled
1 – Enabled
Default: (0) Disabled
Enables Damper or Lubri cation Mode. If start
command is received, VFD will provide 24VDC,
0.5AtoadampermotorandafterDamperdelay
orwhenDSWisclosedVFDwillstartmotor.
FD-7: Damper Delay
Damper Delay
7) 120s
Min: 0s
Max: 6000s
Default: 120s
1. No damper limit switch. After start
command is received, VFD will provide
powertoadampermotorandafterDamper
delay it will start the motor. There is no
damperfaultbylimitswitch.
2. IfadigitalinputissettodamperSWandVFD
receivesruncommand,VF
Dprovidespower
to damper motor and after limi t SW is
closed, it will start a motor. If SW is not
closed within time delay, VFD will trip on
damperfault.
SkipFrequencies
There arethree sets ofSkip Frequency pairsof
parametersthatletyouEnableorDisableorset
LowandHi
ghvalueforeachset.Thedescription
belowappliestoeachsetrespectively:
Disabled:Skipfrequencyisdisabled
Enabled:Skipfrequency allowsyoutoskip
from the VFD reference short frequency
rangeofsystemresonantfrequencies.
If the speed reference given digitally from a
keypadorco
mmunicationissettoavalueinthe
skipzone, the VFDwillrunat Low SkipHzuntil
thespeedcommandisatoraboveHighSkipHz.
Then the VFD speed reference will jump from
Low to High Skip Hz and the VFD output
frequency will ramped up based on the
accelerat
ion time. On each skip zone, the only
condition we need to maintain is that the Skip
High should be at least 1Hz greater than Skip
Low.Betweenzonesitisnotaproblemifthe2
nd
SkipZoneissetbeloworoverlappingthe1
st
one.
Low Frequency (Low frequency of the
resonance skip zone):If analog signal or
communicationisusedforspeedreference,
theVFDwillcontinuetorunatthe LowSkip
Frequency until the signal value is at or
greaterthantheHighSkipFrequency.Then
theVFDwillramp‐upfromLowtoHighskip
Hz based on the a
cceleration time.Range
0HztoPRIMARY‐7(MaxFrequency).
High Frequency (High frequency of the
resonance skip zone): Range‐Low
Frequency for this Skip Frequency to
PRIMARY‐7(MaxFrequency).
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