Santerno Sinus M, User Manual

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10-48
10.26 Functions related to “Fire Mode”
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The Fire mode function is used in all the applications required the continuous operation of the
equipment even if the environmental conditions do not allow it, for example as in pumps and
fans (HVAC) which have to operate during a fire emergency. The drive should then ignore any
alarm tripped and should automatically and endlessly resets even serious trips. When the Fire
mode is activated, the inverter might be damaged.
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Due to the activation of the Fire Mode function, the drive guarantee should be no longer valid if
the conditions for activation of a heavy fault occur. It is possible to detect when a heavy alarm
has tripped if the value of I96 changes to “1”. This will void the drive guarantee. Also, the value
“1” is not initialized.
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When in Fire mode, the Sinus M changes its several internal status as below.
A. Control mode changes to V/F.
B. The value in I88 becomes the frequency reference. This value has priority over any kind of
reference.
C. Acceleration/deceleration time is 10 sec. and cannot be changed.
D. The trips below are ignored, but the fault display just shows what trip has occurred in the
Drive group, whilst the digital output that is defined as “alarm trip” is activated even if the
drive is still controlling the connected motor.

Emergency Stop (Est)

External Trip – A (EtA)

External Trip – B (EtB)

Inverter Overheated (Oht)

Inverter Overload (IOL)

Electrical Thermal trip (EtH)

Output Phase Loss (POt)

Motor Overload (Olt)

Fan Trip (Fan)
E. The Sinus M will endlessly reset the alarms below regardless of the auto-retry number.
However, Auto-retry delay time (H27) is used.

Overcurrent (Oct)

Overvoltage (Ovt)

Low Voltage (Lut)

Ground Trip (GFt)
F. The Sinus M cannot operate when the alarms below have tripped, that damage the inverter.

Self Diagnosis IGBT Broken (FLtL)

Hardware Failure (HWt)

Communication Error with I/O board (Err)