Fire Fire Mode Operation fault in Toshiba drive
Fire Fire Mode Operation fault in Toshiba drive
Description "Fire" is a status/fault state used in HVAC applications (Smoke Purge). When a specific input assigned to "Fire Mode" is triggered, the drive enters a forced run state. It ignores almost all protections (Overload, Overcurrent, Overheat) and runs the motor until it physically melts or the power is cut. This is designed to keep smoke extraction fans running during a building fire to save lives. Causes
1. Building Alarm: The fire alarm system triggered the relay connected to the drive's Fire Mode input.
2. Test Mode: A technician flipped the "Smoke Purge" switch to test the system.
3. Wiring Short: The wire from the fire panel shorted to 24V, falsely triggering the mode. Solution Caution: If this code is on, the drive may run unexpectedly or refuse to stop.
To clear "Fire," you must remove the signal from the input terminal. However, simply removing the signal is often not enough. Many Toshiba firmwares "Latch" this state. You must cycle the main power to reset the drive after a Fire Mode event.
Post-Event Check: If the drive actually ran in Fire Mode during a real emergency or extended test, you must inspect the drive thoroughly. Since safeties were disabled, the drive may have overheated its IGBTs or stressed the motor insulation beyond rated limits. It is often recommended to replace a VFD that has run to exhaustion in a real fire event.
Description "Fire" is a status/fault state used in HVAC applications (Smoke Purge). When a specific input assigned to "Fire Mode" is triggered, the drive enters a forced run state. It ignores almost all protections (Overload, Overcurrent, Overheat) and runs the motor until it physically melts or the power is cut. This is designed to keep smoke extraction fans running during a building fire to save lives. Causes
1. Building Alarm: The fire alarm system triggered the relay connected to the drive's Fire Mode input.
2. Test Mode: A technician flipped the "Smoke Purge" switch to test the system.
3. Wiring Short: The wire from the fire panel shorted to 24V, falsely triggering the mode. Solution Caution: If this code is on, the drive may run unexpectedly or refuse to stop.
To clear "Fire," you must remove the signal from the input terminal. However, simply removing the signal is often not enough. Many Toshiba firmwares "Latch" this state. You must cycle the main power to reset the drive after a Fire Mode event.
Post-Event Check: If the drive actually ran in Fire Mode during a real emergency or extended test, you must inspect the drive thoroughly. Since safeties were disabled, the drive may have overheated its IGBTs or stressed the motor insulation beyond rated limits. It is often recommended to replace a VFD that has run to exhaustion in a real fire event.
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