Emotron VS10 - Mains Failure Control

10.15. Mains failure control
In case of power failure, this function can decelerate the motor and use its rotational
energy to maintain the DC-bus voltage for a certain period of time. This makes it possible
to continue to let the motor run during a short-term failure of the mains voltage. After
mains recovery, the operating status that was active before the failure is adopted again.
Details
A failure of the mains voltage causes a continuous DC-bus voltage drop. If the mains
failure control is enabled in 0x2D66:001 (P721.01), it will get active if the DC-bus voltage
falls below the activation threshold set in 0x2D66:002 (P721.02).
As soon as the mains failure control is active, the motor is decelerated. Now the rotational
energy of the motor is used to maintain the DC-bus voltage above the error threshold for
undervoltage until the motor is decelerated to standstill in a controlled way. This process
is controlled by the DC-bus voltage controller.
① Current DC-bus voltage
② Frequency setpoint (internal input signal)
③ Frequency setpoint (internal output signal for motor control)
The activation and commissioning of the mains failure control are described in detail in
the following subchapters.
Parameter
Name / value range / [default setting]
Info
0x2D66:001
(P721.01)
Mains failure control: Enable function
(Mains fail. ctrl: Enable function)
From version 02.00
1 = enable mains failure control.
0
Disabled
1 Enabled
0x2D66:002
(P721.02)
Mains failure control: DC-bus activation level
(Mains fail. ctrl: DC-bus act.level)
60 ... [0]* ... 90 %
* Default setting depending on the size.
From version 02.00
Threshold below which the mains failure control is activated if it is
enabled (0x2D66:001 (P721.01) = 1).
100 % ≡ nominal DC-bus voltage
Recommended setting:
In general: 5 ... 10 % above the error threshold for undervoltage
(dis
play in 0x2540:003 (P208.03)).
230-V devices: 72 %
•
400/480-V devices: 82 %
0x2D66:003
(P721.03)
Mains failure control: Gain V-controller
(Mains fail. ctrl: Gain V-ctrl)
0.00001 ... [0.01000] ... 0.50000 Hz/V
From version 02.00
Proportional gain of the DC-bus voltage controller.
0x2D66:004
(P721.04)
Mains failure control: Reset time V-controller
(Mains fail. ctrl: Res. time V-ctrl)
5 ... [20] ... 2000 ms
From version 02.00
Reset time of the DC-bus voltage controller.