Mitsubishi Electric FATEC FR-A800 Manual page 84

5
BREAKDOWN MAINTENANCE
Parameter
Name
number
A786 Power failure stop
(668) frequency gain
 When the setting value of F001 (Pr.21) Acceleration/deceleration time increments is "0" (initial value), the setting
range is "0 to 3600 s" and the setting increments are "0.1 s", and when the setting is "1", the setting range is "0 to
360 s" and the setting increments are "0.01 s".
(a) Connection and parameter setting
• Remove the jumpers between terminals R/L1 and R1/L11 and terminals S/L2 and S1/
L21, and connect terminals R1/L11 and P/+, and terminals S1/L21 and N/-.
• If an undervoltage, power failure or input phase loss (H201 (Pr.872) = "1" (with input
phase loss protection)) occurs when A730 (Pr.261) ≠ "0", the motor decelerates to a
stop.
(b) Outline of operation of deceleration stop at a power failure
Connect terminal R1/L11 and terminal P/+,
and connect terminal S1/L21 and terminal N/-.
• If an undervoltage or power failure occurs, the output frequency is turned OFF only for
the frequency set in A731 (Pr.262).
• The motor decelerates for the time set in A733 (Pr.264). (The deceleration time setting is
the time it takes for the motor to stop from F000 (Pr.20) Acceleration/deceleration
reference frequency.)
• Change the deceleration time (slope) to the stop using A734 (Pr.265) when the
frequency is too low to obtain the regenerative power or in other instances.
Power failure deceleration
time switchover frequency
Initial value
Setting
FM CA range
100% 0 to 200%
Power supply
Remove
the jumpers
Power
supply
Subtracted
frequency at
deceleration start
A731 (Pr.262)
A735 (Pr.266)
5.2 Troubleshooting by the demonstration machine
Description
Adjust the response during operation of the deceleration time
automatic adjustment function.
Inverter
R/L1
S/L2
T/L3
R1/L11
S1/L21
P/+
N/-
A733 (Pr.264)
Power-failure deceleration time 1
A734 (Pr.265)
Power-failure deceleration time 2
Time
1
2
3
4
5
6
7
8
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