Appendix B: CPC-3 and VFD Abridged Fault Code Guide
Use the information below to overcome CPC-3 and/or VFD faults. For a complete VFD fault guide, consult the Yaskawa fault code
guide. Contact Tjernlund Products at 800-255-4208 if neither fault code guide provides a solution.
CPC-3 Faults
INDUC MECH FAULT
Cause: The safety circuit between S1 and S2 is open on the VFD.
VSAD: The Motor High Limit or Fan High Limit or Tilt Switch is open.
VSUB: The Motor High Limit is open.
Solution: Varies; see below.
VSAD: Check the continuity of the Motor High Limit, Fan High Limit, and Tilt Switch to determine which is open. If there is no
continuity for either of the limits or the switch, contact Tjernlund Products for a replacement. If all have continuity, verify that the wiring
between the VFD and the fan provides continuity. If continuity does not exist between the VFD and fan, replace the existing wiring.
VSUB: Check the continuity of the Motor High Limit to determine if it is open. If there is no continuity, contact Tjernlund Products for a
replacement. If there is continuity, verify that the wiring between the VFD and the fan provides continuity. If continuity does not exist
between the VFD and fan, replace the existing wiring.
C AIR MECH FAULT
Cause: The safety circuit between S1 and S2 is open.
Fire Freeze Protection (FFP) Limit is open.
Solution: Check the continuity of FFP Limit to determine if it is open. If there is no continuity, contact Tjernlund Products for a replacement.
If there is continuity, verify that the wiring between the VFD and the fan provides continuity. If continuity does not exist between the VFD
and fan, replace the existing wiring.
INDUC PROV FAULT or C AIR PROV FAULT
Cause: The fan prover is not making.
Solution: Inspect the prover, sensing tube, and tubing for problems. One or all may need to be set and/or relocated.
AUX SENSOR FAULT
Cause: The safety is not making on the auxilary device.
Solution: Inspect the auxillery device. The auxilary sensor requires contact closure to work correctly.
INDUC VFD FAULT or C AIR VFD FAULT
Cause: Fault related to VFD.
Solution: Inspect VFD and reference below and/or the Yaskawa fault code guide.
UNDR DRAFT FAULT or C AIR PRES FAULT
Cause: The fan is unable to bring the actual pressure to the CPC-3 set point.
Solution: Check to see if the VFD displays a fault message. If so, see below. If not, verify the transducer is properly functioning. See the
Tjernlund Specified Systems Transducer Sensing Tube Location Guide and/or Section X-4 in the Start-Up and Warranty Activation Guide.
VFD Faults
For a complete guide to the VFD faults, reference the Yaskawa fualt code guide.
ou
, blinking: Check the power supply voltage. Confirm that the power supply matches the supply for which the VFD is rated.
EF
, blinking
:
Verify the fan rotation dip switches within CPC-3 are correctly oriented. Refer to Section E and then proceed to Section J-1
through L-1 in the Start-Up and Warranty Activation Guide.
FAn
, solid: Verify that the VFD cooling fan is plugged in and supplied power.
oL|
, solid: The moter is over-amping. Remove power to the VFD, wait 2 minutes and then reiniate power to the VFD. While VFD is rein-
italizing, press the DSPL button on the VFD until the IOUT LED on the VFD is lit. As the fan begins to operate, compare the amp draw dis
played on the red LED screen of the VFD with that displayed on the fan’s nameplate.
If the value displayed VFD exceeds the number displayed on the fan’s namplate, confirm that the fan impeller is operating in the correct
direction (counter-clockwise). Refer to Section E and then proceed to Section J-1 through L-1 in the Start-Up and Warranty Activation Guide
to alter the direction of the impeller’s rotation, if necessary. Also, verify that all 3 windings of the motor do not return an open Ohm reading.
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