Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 264)

6.8 Diagnosing and Resetting Faults
When a fault occurs and the drive stops, follow the instructions below to remove whatever conditions triggered the fault, then
restart the drive.
Note: An oC/SC fault will be displayed in the event of an IGBT failure. It may not be possible to reset this fault until the IGBT problem is corrected.
u Fault Occurs Simultaneously with Power Loss
WARNING! Electrical Shock Hazard. Ensure there are no short circuits between the main circuit terminals (R/L1, S/L2, and T/L3) or between
the ground and main circuit terminals before restarting the drive. Do not immediately operate peripheral devices if a fuse is blown or a GFCI
has tripped. Failure to comply may result in serious injury or death and will cause damage to equipment.
1.
Turn on the drive input power.
2.
Use monitor parameters U2-oo to display data on the operating status of the drive just before the fault occurred.
3.
Remove the cause of the fault and reset.
Note: 1. To find out what faults were triggered, check the fault history in U2-02. Information on drive status when the fault occurred
such as the frequency, current, and voltage can be found in U2-03 through U2-58. Refer to Viewing Fault Trace Data
After Fault on page 264 for information on how to view fault data.
2. When the fault continues to be displayed after cycling power, remove the cause of the fault and reset.
u If the Drive Still has Power After a Fault Occurs
1.
Look at the HOA keypad for information on the fault that occurred.
2.
Refer to Fault Displays, Causes, and Possible Solutions on page 235 .
3.
Reset the fault. Refer to Fault Reset Methods on page 264 .
u Viewing Fault Trace Data After Fault
Step Display/Result
1. Turn on the drive input power. The first screen displays.
DRV-OFF
U1-01= 0.00Hz
U1-02= 0.00Hz
U1-03= 0.00 A
Freq Ref (AUTO)
LSEQ
LREF
RLY DRV/BYP
2. Press
or until the monitor screen is displayed.
DRV-OFF
U1-01= 60.00Hz
U1-02= 0.00Hz
U1-03= 0.00 A
Monitor Menu
LSEQ
LREF
RLY DRV/BYP
3. Press
to display the parameter setting screen.
DRV-OFF
U1-0 1 = 60.00Hz
U1-02= 0.00Hz
U1-03= 0.00 A
Monitor
LSEQ
LREF
RLY DRV/BYP
4. Press and to scroll to monitor U2-02. The fault code shown in U2-02
is the fault that occurred most recently.
DRV-OFF
U2- 02 = oC
U2-03= 0.00Hz
U2-04= 0.00Hz
Last Fault
LSEQ
LREF
RLY DRV/BYP
5.
Press to view drive status information when fault occurred.
Parameters U2-03 through U2-32 help determine the cause of a fault.
Parameters to be monitored differ depending on the control mode.
DRV-OFF
U2- 03 = 0.00Hz
U2-04= 0.00Hz
U2-05= 0.00A
Frequency Ref
LSEQ
LREF
DRV-OFF
U2- 20 = XX°C
U2-01=
U2-02=
Heatsink Temp
LSEQ
LREF
RLY DRV/BYP
RLY DRV/BYP
u Fault Reset Methods
When a fault occurs, the cause of the fault must be removed and the drive must be restarted. The table below lists the different
ways to restart the drive.
6.8 Diagnosing and Resetting Faults
264 YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual