Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 249)

HOA Keypad Display Fault Name
Cause Possible Solution
The power supply phase order changed during
operation.
Investigate and correct the cause and reset the fault. Refer to Diagnosing and Resetting Faults on
page 264 .
An input power supply wiring terminal is loose.
The fluctuation in the voltage of the input power
supply is too large.
HOA Keypad Display Fault Name
Srr
Internal Resistance Fault
An operation failure occurred in the snubber discharge resistor circuit.
Cause Possible Solution
The snubber discharge resistor or peripheral
circuits failed.
• Cycle power to the drive.
• If the problem continues, replace either the control board or the entire drive. For instructions on
replacing the control board, contact Yaskawa or your nearest sales representative.
HOA Keypad Display Fault Name
SvE
Zero Servo Fault
Position deviation during zero servo.
Cause Possible Solution
Torque limit is set too low Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Excessive load torque Reduce the amount of load torque.
HOA Keypad Display Fault Name
TdE Time Data Error
Cause Possible Solution
An error has occurred in the Real-Clock Time
function of the HOA keypad
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your
nearest sales representative. A communication error has occurred with the
Real-Clock Time function of the HOA keypad
HOA Keypad Display Fault Name
TIM Time Not Set
Cause Possible Solution
The Real-Time Clock for the HOA keypad is not
set in parameter o4-17
• The drive is a new drive, first power-up
condition
• o4-17 was set to (2: Reset), by the user, manually
clearing the Real-Time Clock data.
Set the time for the HOA keypad. Parameter o4-17 = 1.
The drive will display the "TIM" alarm (Time Not Set) whenever the Real time Clock is not set .
Additionally, at power up, if the "TIM" condition is present, the drive will automatically switch to
the time setting screen (o4-17 = 1) for 30 seconds to prompt the user to set the Real-Time Clock.
The user did not set the Real Time Clock when
prompted following power-up.
Cycle power to the drive and set the Real Time Clock within 30 seconds of power-up, or set the clock
manually via parameter o4-17.
The HOA keypad battery is low or the battery has
been replaced
Replace the HOA keypad battery and set the Real-Time Clock.
An error has occurred in the Real-Time Clock
function of the HOA keypad
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your
nearest sales representative.
HOA Keypad Display Fault Name
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the
allowable time (L6-03).
Cause Possible Solution
Parameter settings are not appropriate for the load Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side
Check the load for any problems.
6.4 Fault Detection
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 249
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Diagnostics & Troubleshooting