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VFD CONFIGURATION
CHANNEL & PROFILE
Channel
Profile
SLAVE ADDRESSES
| VFD | Description | Slave Address | |
|---|---|---|---|
| Main Blower | 15 hp centrifugal — air mover into heat exchanger | ||
| Fire Blower | 1.5 hp fire fan — controls heat from dome | ||
| Extractor Blower | 1.5 hp extractor — vents damp air externally | ||
| Ambient Blower | 5 hp ambient fan — introduces fresh air |
STARTUP RAMP — MAIN BLOWER
Lengthening the drive ramp (P0-17 / P0-18) reduces inrush current and DC-bus sag that
causes F-09 undervoltage on the 15 hp Main Blower. When enabled, these parameters are
written to the drive on PLC startup (RAM only — reversible by disabling and power-cycling).
Fire Blower is not affected (slow decel would delay fault stops).
Write ramp on startup
P0-17 acceleration time
s
P0-18 deceleration time
s
P0-19 time unit
0.1 s (fixed when writing on startup)
UNDERVOLTAGE DIAGNOSTICS
Bus voltage warn threshold
V
Logs a warning when DC bus voltage drops below this value during polling. Set just above
the drive undervoltage threshold (d5-06, default 350 V). Set to 0 to disable.