Toshiba Q7 User manual
Operating Conditions at the Time of Trip
The operating conditions at the time of a trip can help determine the cause of the trip. These are the conditions the operator should assess to correct the problem or be prepared to discuss when contacting Toshiba Customer Support:
- What trip information is displayed?
- Is this a new installation?
- Has the system ever worked properly, and what recent changes have been made (if any)?
- What is the size of the VFD/Motor?
- What are the CPU version and revision level?
- Does the VFD trip during acceleration, operation, deceleration, or when not running?
- Does the VFD reach the commanded frequency?
- Does the VFD trip without the motor connected?
- Does the VFD trip with an unloaded motor?
Viewing Trip Information
If the condition causing an alarm does not return to normal within a specified time, a trip occurs. When a trip occurs, information about the fault can be viewed from the Trip History screen (Program ⇒ System Information and Setup ⇒ Trip History) or the Monitor screen.
Trip History
The Trip History screen records system parameters for up to 24 trips (RTC option required). Recorded trips are numbered from zero to 23. Once the Trip History record reaches trip number 23, the oldest recorded trip will be deleted with each new entry (first-in, first-out). The Trip # field can be selected and scrolled through to view the recorded trip information for a specific trip number. The monitored parameters are listed in Table 13 as Parameters Recorded at the Time of Trip (parameter readings at the time the trip occurred).
Trip Record on the Monitor Screen
The Monitor screen records and displays the trip name of up to four trips, cataloging each as Past Trip #1, Past Trip #2, Past Trip #3, and Past Trip #4. Once reset (Clear Trip), the trip records are erased. If no trips have occurred since the last reset, "No Error" is displayed for each trip record.
Note: Incorrect VFD setup may cause some trips — reset the VFD to factory default settings before diagnosing a systemic malfunction (Program ⇒ Utilities ⇒ Type Resets ⇒ Restore Factory Defaults).
The frequency at the time of the last trip can be viewed on the Monitor screen (see page 45). The trip record on the Monitor screen is erased when the VFD is reset and can be viewed without the RTC option. When no trip is active, the current output frequency is displayed here.
Clearing a Trip
Once the cause of the trip has been corrected, performing a Reset will re-enable the VFD for normal operation (clearing the fault screen).
The fault screen can also be cleared using one of the following methods:
Cycling power (trip information may be saved via parameter F602 if desired),
Pressing the Stop/Reset key twice,
Remotely via the communication channel,
Momentarily connecting terminal RES to CC on the Control Terminal Strip, or
Program ⇒ Utilities ⇒ Type Resets ⇒ Clear Past Trips.
Parameters Recorded at the Time of Trip
- Trip Number
- Trip Type
- Date and Time
- Frequency at Trip
- Output Current
- Output Voltage
- Direction
- Frequency Reference
- Bus Voltage
- Digital Input Status
- OUT1/OUT2/FL Status
- Timer
- Post Compensation Frequency
- Feedback (instantaneous)
- Feedback (1 second)
- Torque
- Torque Reference
- Torque Current
- Excitation Current
- PID Value
- Motor Overload
- VFD Overload
- DBR Overload
- Motor Load
- VFD Load
- DBR Load
- Input Power
- Output Power
- Peak Current
- Peak Voltage
- PG Speed
- PG Position
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