PROGRAMMING GUIDE
SINUS PENTA
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A044 SW Overcurrent
A044 Description
SW Overcurrent
Immediate current limit tripped
Possible
cause
• Abrupt variations of the connected load
• Output short-circuit or ground short-circuit
• Strong electromagnetic disturbance or radiated interference.
If alarm A044 tripped while accelerating:
• Too short acceleration ramp;
If alarm A044 tripped while decelerating:
• Too short deceleration ramp.
• Excessive gain of the current regulator (P155) or too short integral time (P156
when using the FOC control algorithm.
• Excessive gain of the speed regulator (P128) or too short integral time (P126)
when using the VTC control algorithm.
Solution
1. Check if the drive and the motor are properly dimensioned with respect to the
connected load.
2. Make sure that no output short-
circuit is to be found between two phases or
between one phase and the grounding (terminals U, V, W
the motor, set IFD control and operate the drive in no-load conditions.)
3. Check if the command signals are sent to the drive using screened cables where
required (see Sinus Penta’s Installation Guide). Detect external sources
for
electromagnetic disturbance, check wiring and make sure that antidisturbance
filters are installed on the coils of contactors and electrovalves (if fitted inside the
cabinet).
4 If necessary, set longer acceleration times (see the RAMPS MENU).
5 If necessary, set longer deceleration times (see the RAMPS MENU).
6. If necessary, decrease the values set in the LIMITS MENU.
A045 Bypass Circuit Fault
A045 Description Bypass precharge Fault
Event
The drive forced to close its relay or contactor for the short-circuit of the precharge
resistors in DC-link capacitors (DC bus), but it
did not detect the relevant closing
signal while precharging.
Possible
cause
• Disconnection of auxiliary signal.
• Precharge relay/contactor failure.
Solution
1. Reset the alarm: send a RESET command.
2. If the alarm persists, please contact ELETTRONICA SANTERNO’s Customer
Service.
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