77
(18) Operation Selection at Power Loss (Sn-18)
•This parameter specifies the processing to be performed when a momentary power
loss occurs (within 2 sec)
Sn-18= 0 : When power loss ride through is enabled, operation will be restarted
after a speed search envoked if the power is restored within the allowed
time.
= 1 : When power loss ride-through is disabled the inverter will stop after a
momentary power loss. An undervoltage fault will be detected then. If
the power is interrupted for more than 2 seconds, the fault contact
output will operate and the motor will coast to stop.
(19) Zero Speed Braking Selection (Sn-19)
•The run-source and frequency command is input from control circuit under the
setting of Sn-04=1 & Sn-05=1, If Sn-19 is enabled, the blocking torque will be
generated in DC-braking mode when the frequency command is 0V and forward –
run source is “ON”.
• A time-chart shows the above action as below. The zero-braking selection Sn-19 is
set to 1 and the DC-braking current Cn-15 is limited within 20% of rated current.
OFF OFFON
t
t
t
Run
Stop signal
(external terminal)
Frequency command
(external terminal)
DC injection
braking (20% Max.)
Fig. 36 Zero speed braking operation selection
(20) External Fault Contact e Contact Selection (Sn-20)
Sn-20= 0 : Input signal is from A-contact. (Normal-open contact)
= 1 : Input signal is from B-contact. (Normal-close contact)
(21) External Fault Contact e Detection Selection (Sn-21)
Sn-21= 0: Always detects.
= 1: Detect only during running.
(22) Detection Mode Selection of External Fault (Sn-22)
•An external fault is detected (at terminal
e
), the following operation will be
performed based upon the setting of Sn-22
Sn-22= 0: Decelerate to stop with the specified deceleration time Bn-02.
= 1: Coast to stop.
= 2: Decelerate to stop with the specified deceleration time Bn-04.
= 3: Continue running with no regard of external fault.
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