SINUS PENTA
PROGRAMMING GUIDE
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41. POWER DOWN MENU
41.1. Overview
In the case of power failure, the drive can be kept powered on by exploiting the kinetic energy of the motor and the load:
energy recovered due to motor slowing down is used to power the drive, thus avoiding losing the drive control when a
black–out occurs.
All parameters relating to the Power Down function are included in the Power Down submenu in the Configuration
menu.
The following options are available (parameter C225):
– [NO]: The function is disabled.
– [YES]: After the time set in C226 (Power Down start delay), starting from the instant when power down occurs, a
deceleration ramp takes place (deceleration ramp in Power Down C227). The time period of the deceleration ramp can
be user-defined.
– [YES V]: In case of power down for a time longer than C226, the motor coasts to stop, so that DC bus voltage value is
kept constant at C230. To do so, a PI (proportional–integral) regulator is used, which is adjusted through parameter
C231
(proportional term) and C232 (integral term).
– [Alarm]: In case of power down, when the time set in C226 is over, alarm A064 trips (factory setting).
NOTE
If the mains loss deactivates the ENABLE-A and ENABLE-B commands
coast to stop, because these commands are required for the hardware enable of IGBTs.
NOTE
If a drive is DC-powered by a Regenerative Penta (or an equivalent drive
voltage), Power Down cannot occur (C008 = xT Regen, where x can be 2, 4, 5, or 6 ).
Figure 63: Power Down (Example)
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