Nidec H300 - Oht Power; OI Ac

Safety
information
Product
information
Mechanical
installation
Electrical
installation
Getting
started
Basic
parameters
Running the
motor
Optimization
NV Media Card
Operation
Building
Automation
Advanced
parameters
Technical
data
Diagnostics
UL listing
information
HVAC Drive H300 301
Issue Number: 3
OHt Power Power stage over temperature
22
This trip indicates that a power stage over-temperature has been detected. The sub-trip "xxyzz" indicates which thermistor
is indicating the over-temperature. The thermsitor numbering is different for a single module type drive (i.e. no parallel
board fitted) and a multi-module type drive (i.e. parallel board fitted with one or more power modules) as shown below:
Single module type drive:
Multi-module type system:
Note that the power module that has caused the trip cannot be identified except for the braking IGBT temperature
measurement
Recommended actions:
• Check enclosure / drive fans are still functioning correctly
• Force the heatsink fans to run at maximum speed
• Check enclosure ventilation paths
• Check enclosure door filters
• Increase ventilation
• Reduce the drive switching frequency
• Reduce duty cycle
• Decrease acceleration / deceleration rates
• Reduce motor load
• Check the derating tables and confirm the drive is correctly sized for the application.
• Use a drive with larger current / power rating
OI ac Instantaneous output over current detected
3
The instantaneous drive output current has exceeded VM_DRIVE_CURRENT_MAX. This trip cannot be reset until 10 s
after the trip was initiated.
Recommended actions:
• Acceleration/deceleration rate is too short
• If seen during auto-tune reduce the voltage boost
• Check for short circuit on the output cabling
• Check integrity of the motor insulation using an insulation tester
• Check feedback device wiring
• Check feedback device mechanical coupling
• Check feedback signals are free from noise
• Is motor cable length within limits for the frame size
• Reduce the values in the speed loop gain parameters - (Pr 03.010, 03.011, 03.012) or (Pr 03.013, 03.014, 03.015)
• Has the phase angle autotune been completed? (RFC-S mode only)
• Reduce the values in current loop gain parameters (RFC-A, RFC-S modes only)
Trip Diagnosis
Source xx y zz Description
Power system 01 0 zz Thermistor location defined by zz in the power board
Power system 01
Rectifier number
zz Thermistor location defined by zz in the rectifier
Source xx y zz Description
Power system power module number 0 01 U phase power device
Power system power module number 0 02 V phase power device
Power system power module number 0 03 W phase power device
Power system power module number 0 04 Rectifier
Power system power module number 0 05 General power system
Power system power module number 0 00 Braking IGBT
Source xx y zz Description
Control
system
00 0
00
Instantaneous over-current trip when the measured a.c. current
exceeds VM_DRIVE_CURRENT[MAX].
Power
system
Power
module
number
0