Fault
Code
No.
Message
Description
Corrective Action
-o
48
Feedback Pressure
Low
Low Pressure
Detected by Pipe
Fill Function
Check the pump system for leaks or burst pipes.
Check the Pipe fill function has been commissioned correctly (P3-16 & P3-17).
t-
49
Output Phase Loss
Output (Motor)
Phase Loss
One of the motor output phases is not connected to the drive.
S-F
50
Modbus Comms
fault
Built-in
Modbus RTU
communication
timeout or
Communication
Option Module
Fault
When using Modbus RTU:
Valid Modbus telegram has not been received within the watchdog time limit set
in P5-05.
Check the network master / PLC is still operating.
Check the connection cables.
Increase the value of P5-05 to a suitable level.
When using an optional fieldbus Interface:
Internal communication to the inserted Communication Option Module has
been lost.
Check the module is correctly inserted.
S-F
52
Plug-in
communication
option module
timeout
Fitted
communication
Module Fault
A telegram containing a valid Control Word from the network master has not
been received within the watchdog time limit set in P5-05.
Check the network master / PLC is still operating.
Check the connection cables.
Increase the value of P5-05 to a suitable level.
S-F
53
IO Card Comms
fault
IO card comms trip Internal communication to the inserted I/O Option Module has been lost.
Check the module is correctly inserted.
S-F
54
BACnet Comms fault BACnet comms
loss trip
A valid BACnet telegram has not been received within the watchdog time limit
set in P5-05.
Check the network master / PLC is still operating.
Check the connection cables.
Increase the value of P5-05 to a suitable level.
12.2. Resetting a Fault
When the drive trips, and a fault message is displayed, it can be reset in one of the following ways:
Completely remove the incoming power supply, and allow the power to power off completely. Re-apply the power.
Remove and reapply the enable input.
Press the stop / Reset button.
If Fieldbus is being used, set the reset bit in the control word from 0 to 1.
In the event of O-I, hO-I or I.t-trp faults, in order to prevent damage that may occur through repeatedly enabling the drive into a fault
condition, these trips cannot be reset immediately. A delay time according to the following table must be allowed before reset is
possible.
First Trip
2 seconds delay before reset is possible
Second Trip
4 seconds delay before reset is possible
Third Trip
8 seconds delay before reset is possible
Fourth Trip
16 seconds delay before reset is possible
Fifth Trip
32 seconds delay before reset is possible
Subsequent Trips
64 seconds delay before reset is possible
Ñ82-HEMAN-LFT_V3.11>Ó
82-HEMAN-LFT_V3.11
Lafert S.p.A.
J.F. Kennedy, 43
30027 San Donà di Piave - Venezia, Italy
Phone +39 0421 229 611 Fax +39 0421 222 90
www.lafert.com
