YASKAWA OYMC V1000, Programming Manual

Page: 195 / 408

1.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual 195
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25. When the power supply returns, the drive accelerates back to the frequency reference
using the selected acceleration time.
Activation and Deactivation of the KEB Function
The KEB function requires parameter L2-01 to be set to 1 or 2 and a digital input has to be
configured for the KEB 1 (H1-
= 65/66) or KEB 2 (H1- = 7A/7B) command. The
input has to be enabled during KEB. Refer to Setting 65/66: KEB Ride-Thru 1 (N.C.) / 2
(N.O.) on page 153 and Setting 7A/7B: KEB Ride-Thru 2 (N.C. / N.O.) on page 156 for
details on setting the KEB input commands.
The KEB function is automatically activated when one of the conditions below becomes
true.
• The DC bus voltage falls below the level set in parameter L2-05. The KEB input has to be
set within 50 ms after the KEB function was activated, or the drive will assume the power
supply has returned and attempt to restart.
• The input programmed for KEB 1 or 2 is activated. This input should be triggered by an
external undervoltage detection relay.
The KEB function ends when one of the conditions below become true.
• when the KEB input is released or
• when the function was activated by DC bus voltage detection and no KEB input was set
within 50 ms after the KEB activation.
Figure 1.78 shows a wiring example for triggering the KEB function at power loss using
digital input S6.
Figure 1.78
Figure 1.78 KEB Function Wiring Example
Note:
Make sure the Run command is not switched off when momentary power
loss occurs. If the Run command is shut off, the drive will not accelerate
M
UV Detection
Relay
R/L1
S/L2
T/L3
S6 - KEB command 1 or 2
S1 - Start command
SC
U/T1
V/T2
W/T3
B1 B2
L1
L2
L3
Braking
Resistor