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VFD68 Variable Frequency Drives
74
Table 75: Speed Greatly Differs From the Setting
Check
Points
Possible Cause
Action
Input
Signal
Analog input device is not creating the proper
analog signal.
Measure the input signal level.
The analog input signal lines are affected by
external EMI.
Use shielded wire for the low
-
voltage analog inputs and
route the wiring away from
high
-
voltage wiring. Connect shields to VFD terminal 5.
If EMI still affects the control or the VFD, then install a
ferrite core (such as
TDK P/N: ZCAT3035-1330) on the analog input wiring.
Param.
Setting
Torque Boost or Maximum Speed settings are
improper.
Check the settings of P. 1 and P. 2.
Motor Speed versus Pressure Ramp settings are
improper.
VFD68Bxx and VFD68 Cxx:
Check the C 2 to C 7
settings.
VFD68Dxx:
Check the P.905 to P.905 settings.
P. 32 setting is incorrect.
Determine the best minimum motor speed needed
before the motor shuts off and use that value for P. 32.
Table 76: Acceleration/Deceleration is not Smooth
Check
Points
Possible Cause
Action
Param.
Setting
Acceleration/deceleration time is too short or too
long.
Change P. 7 and P. 8 values.
Table 77: Speed Varies During Operation
Check
points
Possible Cause
Action
Input
signal
The analog input signal lines are affected by
EMI.
Use shielded wires for the low
-
voltage analog input
signal lines. Route the wiring away from high
-
voltage
wiring. Connect shields to VFD terminal 5. If EMI still
affects the control or the VFD, then install a ferrite core
(such as TDK P/N: ZCAT3035-1330) on the analog
input wiring.
Param.
Setting
The power supply voltage fluctuates too much.
Change the P. 19 setting to the voltage rating on the
controlled motor.
Table 78: Operation Mode Cannot Be Changed
Check
Points
Possible Cause
Action
Input
Signal
Start signal is enabled (terminal STF is
connected to terminal SD).
Check that a jumper is not connecting the STF and SD
terminals. If the jumper is connected, the operation
mode cannot be changed.
Table 79: Operation Panel Display Malfunctions
Check
Points
Possible Cause
Action
Display
The operation panel display malfunctions.
Contact PENN by Johnson Controls Application
Engineering at 1-414-524-5535 or
1-800-275-5676.