Danfoss PTU 025 User Manual

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9.4.94 ALARM 423, FPC Updating
Cause
The alarm is generated when the fan power card reports it has an invalid PUD. The control card attempts to update the PUD. A
subsequent alarm can result depending on the update. See Alarm 424, FPC Update Successful and Alarm 425 FPC Update Failure.
9.4.95 ALARM 424, FPC Update Successful
Cause
This alarm is generated when the control card has successfully updated the fan power card PUD.
Troubleshooting
Press [Reset] to stop the alarm.
9.4.96 ALARM 425, FPC Update Failure
Cause
This alarm is generated after the control card failed to update the fan power card PUD.
Troubleshooting
Check the fan power card wiring.
Replace fan power card.
Contact supplier.
9.4.97 ALARM 426, FPC Config
Cause
The number of found fan power cards does not match the number of configured fan power cards. See parameter group 15-6* Option
Ident for the number of configured fan power cards.
Troubleshooting
Check fan power card wiring.
Replace fan power card.
9.4.98 ALARM 427, FPC Supply
Cause
Supply voltage fault (5 V, 24 V, or 48 V) on fan power card is detected.
Troubleshooting
Check fan power card wiring.
Replace fan power card.
9.5 Troubleshooting
Table 97: Troubleshooting
Symptom
Possible cause
Test
Solution
Display dark/No
function
Missing input power.
Check for loose connections.
Check the input power source.
Missing or open fuses.
See Open power fuses in this table
for possible causes.
Follow the recommendations provi-
ded.
No power to the LCP.
Check the LCP cable for proper
connection or damage.
Replace the faulty LCP or connection
cable.
Short circuit on control volt-
age (terminal 12 or 50) or at
control terminals.
Check the 24 V control voltage sup-
ply for terminal 12/13 to 20–39, or
10 V supply for terminals 50–55.
Wire the terminals properly.
Incompatible LCP (LCP from
VLT
®
2800 or
5000/6000/8000/ FCD or
FCM).
–
Use only LCP 101 (P/N 130B1124) or
LCP 102 (P/N. 130B1107).
AQ262141314214en-000301 / 130R0880 | 151Danfoss A/S © 2021.11
Maintenance, Diagnostics, and
Troubleshooting
VLT® HVAC Drive FC 102
Operating Guide

Danfoss PTU 025 Specifications

General

Brand	Danfoss
Model	PTU 025
Category	DC Drives
Language	English