74
Commander S100 User Guide
P2.27
Fire Mode Reference
Range: ±
Maximum Frequency Limit
(P2.02)
Default: 0.0
Hz
The use of fire mode can result in damage to the drive.
When a digital input function is set as "Fire Mode" and the input is active, the drive enable and run signals are made active regardless of the state
of hardware enable or software enable inputs and the
Ramp Input
(P1.13) is set to and held at the value of
Fire Mode Frequency
(P2.27).
In addition to this the following are true:
•
A positive value of
Fire Mode Frequency
(P2.27) turns the motor forward and a negative value reverse
•
Limit switches are disabled, and any limit switch flags are cleared
•
The acceleration rate and S-ramp percentage are selected as normal
•
Current limits behave as normal
•
The enable/run latch is reset
•
All other inputs are ignored
•
The drive's internal fan is set to full speed
Errors
Once fire mode is active, only critical errors that prevent the drive from operating can occur. If any of the errors below occur, the drive will attempt
to automatically reset the error after one second. Errors not deemed critical will be recorded in the error log but the drive will keep running.
If fire mode does suppress an error not deemed critical, when fire mode is deactivated the drive will generate an error E172 "Fire Mode Error".
Value
Description
Resettable
E001
D.C. Bus Over Voltage Instant
Yes
E002
D.C. Bus Over Voltage Delayed
Yes
E003
Output Over Current
Yes
E021
Inverter Model Over Temperature
Yes
Important Warning
When Fire Mode is active the motor overload and thermal protection are disabled, as well as a number of drive protection functions.
Fire Mode is provided for use only in emergency situations where the safety risk from disabling protection is less than the risk from the
drive generating an error - typically in smoke extraction operation to permit evacuation of a building. The use of Fire Mode itself causes
a risk of fire from overloading of the motor or drive, so it must only be used after careful consideration of the balance of risks.
Care must be taken to prevent inadvertent activation or de-activation of Fire Mode.
Care must be taken to ensure that the function Fire Mode (20) is not selected inadvertently in parameters P5.17, and P6.14 to P6.20.
It is recommended that the drive parameters should be protected from un-authorized changes by using
Security PIN
(P4.02) to reduce
the risk. The parameters listed may also be changed via serial communications so adequate precautions should be taken if this
functionality is utilized.
WARNING
Summary of Contents for COMMANDER S100
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