Toshiba Adjustable Speed Drive H3 Operation Manual page 105

Drive Fault Displays and Explanations (cont'd)
DBR OVERCURRENT
Cause: IGBT7 (dynamic braking transistor) is damaged
Comments: Check ohm value connected to "PA" and "PB" terminals (see page 9-16 for minimum
ohm values). If using multiple resistors, make sure parallel-series combination is wired correctly.
Check IGBT7. Check DC bus fuse for continuity; if open, check output transistors. Consult your
Toshiba distributor for authorized service.
DBR OVERLOAD
Cause: Dy namic braking resistor is in danger of overheating (as determined by drive).
Comments: Check that the values entered into Item 143, BRAKING RESISTOR VALUE and Item
144, BRAKING RESISTOR POWER RATING are correct.
OVERHEAT
Cause: Drive's heatsink exceeded 90
Comments: Check drive's muffin fans (if any). Clear heatsinks of anything blocking airflow.
The enclosure that the drive is installed in may be too small or there may be to many heat sources
in the same enclosure. Drive may not have been properly sized for operating altitude. Thermistor
on heatsink may be bad.
EMERGENCY OFF
Cause: Drive received one of the following ESTOP commands:
1. Drive was receiving STOP/START command via terminal strip when STOP button on keypad
was pressed.
2. One of the drive's input terminal's function is set to "10" (see Items 44-55 and page 9-9), and
terminal is being opened/closed to command ESTOP.
EEPROM WRITE FAILURE or EEPROM READ FAILURE
Cause: EEPROM was unable to read/write to peripherals.
Comments: Check for miswiring that may be causing noise (such as "CC" connected to ground,
an external 10 volt source connected to "PP" etc.) Control board may need to be replaced (part
number 45996). See picture of board on page 5-2.
RAM ERROR or ROM ERROR
Comments: Check for miswiring that may be causing noise (such as "CC" connected to ground,
an external 10 volt source connected to "PP" etc.). Replace control board (part number 45996).
See picture of board on page 5-2.
OPTION ROM ERROR
Comments: Check for miswiring that may be causing noise (such as "CC" connected to ground,
an external 10 volt source connected to "PP" etc.). If drive is energized with option ROM installed
and is later energized without option ROM installed, this fault will appear. Reset in normal fashion.
CPU ERROR
Comments: If option ROM or option board is installed or removed when drive is powered, this
fault will appear. Reset like any fault. Check for miswiring that may be causing noise (such as
"CC" connected to ground, an external 10 volt source connected to "PP" etc.). If the CPU is truly
damaged, the fault will not reset and replacement of the control board (part number 45996) is
necessary. See picture of control board on page 5-2.
COMMUNICATION ERROR
Cause: RS232 or RS485 timer did not respond
Comments: Check wiring to RS232 or RS485 ports. Check setting of Item 264,
COMMUNICATION SELECTION (should be "1" for RS485). Check jumpers J1, J2, and J3 on
RS485 option board (see RS485 Communications Option Manual). Cable may be broken.
TOSHIBA
o C.
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