Yaskawa CIMR-V7AM-091 - Manual (Page 12)

Date: 02/20/05, Rev: 05-02 Page 12 of 15 TM.V7SW.091
KEB Command Using Multi-function Digital Input
Programming the KEB command to a multi-function digital input, KEB starts with the KEB Command
OR the drive’s DC bus voltage. The drive specifies the recovery from the power loss when these
signals are restored after the Power Loss Detection Relay Delay Time elapses, and re-accelerates
up to the former speed.
Note: Set KEB Starting Voltage (n048) to a lower value when using the multi-function digital input
KEB command. This will prevent the DC bus voltage detection circuit from activating KEB.
KEB Without a Braking Resistor
Behavior when deceleration stall prevention operates at deceleration (Stall Prevention during
Deceleration Enabled: n092 = 0)
Drive main circuit
DC bus bar voltage Braking Transistor Operational Voltage or Deceleration
←Stall Prevention Operational Voltage (n049)
Drive output frequency
KEB Starting Voltage→
(n048)
0
Power
loss
↓
During under
voltage detection
OFF
KEB Command
0
ｎ019or n021acceleration ratio
OFF ON
Power Loss Detection Relay Delay Time (n144)
OFF
OFF
ON
ON
OFF
During KEB
operation OFF
KEB Deceleration ratio changeover time (n047)
KEB Deceleration Time 1
(n045)
KEB deceleration time 2 (n046)
RUN(FWD) command ON
KEB Re-acceptance prohibition time (n145)
Drive main circuit
DC bus bar voltage
Drive output frequency
KEB starting voltage→
0
Power Loss
↓
0
When deceleration stall prevention
operates at deceleration
↓
←Braking transistor operation voltage or
deceleration stall prevention operational
voltage(n049)
Deceleration ratio or deceleration time
without KEB function →
Multifun
c
tion
In
p
ut
Mult
ifu
n
ction
Ou
tp
ut
<2> Depending on set value of KEB
re-acceleration time selection (n146)
Power
Recovery