Control Techniques Unidrive 1 Series User Manual page 201

Safety Product Mechanical
Information Information Information
Trip
OI.br Over Current in braking transistor
Over current threshold in the braking transistor has been reached.
This can be caused by the following:
4 • A short-circuit exists across the braking resistor terminals.
• An insulation fault on the braking resistor or associated cables.
• The ohmic value of the braking resistor is too low.
OI.dc n DC over current trip in module n
134 to 141 DC instantaneous over current trip in module n (size 5 only)
OP.OVLd Control terminals output overload
26 The total current drawn from the user +24V supply (terminal 22) and any digital outputs (terminals 24, 25 and 26) exceeds 240mA.
Ot HS n Heatsink over temperature in module n
Heatsink over temperature threshold has been reached in module n (size 5 only); detected by one of the two thermistors in the drive.
Ensure that ventilation at the front and rear of the drive is adequate.
Check cubicle / drive fans are still functioning correctly.
Check cubicle ventilation paths.
102 to 109 Check cubicle door filters.
Increase ventilation.
Decrease acceleration / deceleration rates.
Reduce duty cycle.
Reduce motor load.
Ot inP Input stage over temperature
Input stage over temperature threshold has been reached (size 5 only).
Ensure that ventilation at the front and rear of the drive is adequate.
Check cubicle / drive fans are still functioning correctly.
Check cubicle ventilation paths.
101 Check cubicle door filters.
Increase ventilation.
Decrease acceleration / deceleration rates.
Reduce duty cycle.
Reduce motor load.
OU Over Volts on the DC bus
Over voltage threshold on the DC bus has been reached.
400V Unidrive: >830Vdc
200V Unidrive LV: >415Vdc
This is due to excessive AC supply voltage or excessive regenerated power being returned to the drive that can be caused by the
following:
2 • Pr 0.04 Deceleration rate set too low.
• An external force acting on the motor shaft causing the drive to regenerate.
• Braking resistor value is too high.
• AC supply voltage too high.
• Supply disturbance such as a voltage over-shoot as the supply recovers from a notch induced by a DC drive.
• Motor insulation fault.
OU n Over volts on the DC bus in module n
Over voltage threshold on the DC bus of module n of 830Vdc, has been reached (size 5 only). (The FLC of the drive is displayed in
Pr 11.32)
This is due to excessive regenerated power being returned to the drive that can be caused by the following:
• Pr 0.04 Deceleration rate set too low.
126 to 133 • An external force acting on the motor shaft causing the drive to regenerate.
• Braking resistor value is too high.
• AC supply voltage too high.
• Supply disturbance such as a voltage over-shoot as the supply recovers from a notch induced by a DC drive.
• Motor insulation fault.
OU.SPd Over speed
The motor speed has reached the over speed threshold (Pr 3.08).
This can be caused by the following:
• Sudden removal of a large mechanical load from the motor shaft.
• Pr 0.04 Deceleration rate set too low.
7
• Inappropriate setting for Pr 0.16 Stop mode selector.
• Pr 0.19 S-ramp da/dt set too high.
• Pr 3.08 set below the maximum reference obtainable, i.e. set less than Pr 0.02 (or Pr 1.06).
• Speed over-shoot due to high speed loop proportional gain (Pr 3.10)
Unidrive User Guide
Issue Number: 9
Electrical Getting
Menu 0
Information Started
www.controltechniques.com
Running
Optimisation Macros
the motor
Diagnosis
Advanced Technical
Diagnostics
Parameters Data
UL Listing
Information
201