An error has occurred in the Real-Clock Time
function of the digital operator
Replace the digital operator. For instructions on replacing the digital operator, contact Yaskawa or your
nearest sales representative.
Digital Operator Display Fault Name
TIM TIM Time Not Set
Cause Possible Solution
The Real-Time Clock for the digital operator
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 o4-17 to 1 to set the time for the digital operator.
The drive will display the "TIM" alarm (Time Not Set) when 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 digital operator battery is low or the
battery has been replaced
Replace the digital operator battery and set the Real-Time Clock.
An error has occurred in the Real-Time Clock
function of the digital operator
Replace the digital operator. For instructions on replacing the digital operator, contact Yaskawa or your
nearest sales representative.
Digital Operator Display Fault Name
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for Torque Detection Level 1 (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.
Digital Operator Display Fault Name
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for Torque Detection Level 2 (L6-05) for longer than
the allowable time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for the
load
Check L6-05 and L6-06 settings
There is a fault on the machine side Check the load for any problems.
Digital Operator Display Fault Name
UL6 UL6
Motor Underload
The weight of the load has fallen below the underload curve defined in L6-14.
Cause Possible Solution
The output current has fallen below the motor
underload curve defined in L6-14 for longer
than the time set to L6-03
Adjust the value set to L6-14 so that output current remains above the motor underload curve during
normal operation.
Digital Operator Display Fault Name
<1>
UnbC
Current Unbalance
Current flow has become unbalanced.
Cause Possible Solution
The internal current sensor has detected a
current unbalance situation.
• Check wiring
• Check for damaged transistors.
• Check for short circuits or grounding problems on the connected motor.
<1> Detected in models 4A0930 and 4A1200.
6.4 Fault Detection
308
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
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