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Digitax ST User Guide 189
Issue: 5
OI.AC Instantaneous output over current detected
3
Over current threshold is Kc/0.45 (see the Digitax ST Advanced User Guide for Kc values)
Acceleration /deceleration rate is too short.
If seen during autotune reduce voltage boost Pr 5.15
Check for short circuit on output cabling
Check integrity of motor insulation
Check feedback device wiring
Check feedback device mechanical coupling
Check feedback signals are free from noise
Is motor cable length within limits
Reduce the values in speed loop gain parameters – Pr 3.10, Pr 3.11 and Pr 3.12
Has offset measurement test been completed?
Reduce the values in current loop gain parameters - Pr 4.13 and Pr 4.14
OI.br Braking transistor over-current detected: short circuit protection for the braking transistor activated
4
Check braking resistor wiring
Check braking resistor value is greater than or equal to the minimum resistance value
Check braking resistor insulation
O.Ld1 Digital output overload: total current drawn from 24 V supply and digital outputs exceeds 200 mA
26 Check total load on digital outputs (terminals 24,25,26) and +24 V rail (terminal 22)
O.SPd Motor speed has exceeded the over speed threshold
7
Increase the over speed trip threshold in Pr 3.08
Reduce the speed loop P gain (Pr 3.10) to reduce the speed overshoot
OV DC bus voltage has exceeded the peak level or the maximum continuous level for 15 seconds
2
Increase deceleration ramp (Pr 0.04)
Decrease braking resistor value (staying above the minimum value)
Check nominal AC supply level
Check for supply disturbances which could cause the DC bus to rise – voltage overshoot after supply recovery from a notch induced
by DC drives.
Check motor insulation
Drive voltage rating Peak voltage Maximum continuous voltage level (15 s)
200 415 400
400 830 800
If the drive is operating in low voltage DC mode the overvoltage trip level is 1.45 x Pr 6.46.
PAd Keypad has been removed when the drive is receiving the speed reference from the keypad
34
Install the keypad and reset
Change speed reference selector to select speed reference from another source
PH AC voltage input phase loss or large supply imbalance detected
32
Ensure all three phases are present and balanced
Check input voltage levels are correct (at full load)
N
Load level must be between 50 and 100 % for the drive to trip under phase loss conditions. The drive will attempt to stop the motor
before this trip is initiated.
PS Internal power supply fault
5
Remove any Solutions Modules and reset
Hardware fault - return drive to supplier
PS.10V 10 V user power supply current greater than 10 mA
8
Check wiring to terminal 4
Reduce load on terminal 4
PS.24V 24V internal power supply overload
9
The total user load of the drive and Solutions Modules has exceeded the internal 24 V power supply limit.
The user load consists of the drive’s digital outputs, the SM-I/O Plus digital outputs, the drive’s main encoder supply and the SM-
Universal Encoder Plus encoder supply.
• Reduce load and reset
• Provide an external 24 V >50 W power supply
• Remove any Solutions Modules and reset
PSAVE.Er Power down save parameters in the EEPROM are corrupt
37
Indicates that the power was removed when power down save parameters were being saved.
The drive will revert back to the power down parameter set that was last saved successfully.
Perform a user save (Pr xx.00 to 1000 or 1001 and reset the drive) or power down the drive normally to ensure this trip does not
occur the next time the drive is powered up.
Trip Diagnosis
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