Hitachi L100 IP Series, Instruction Manual

Page: 36 / 94

Chapter 7 – Control circuit terminal functions
7-8
FRS: Free run stop
Terminal function
When a digital input configured as FRS is activated, then the inverter stops output and the motor enters the
free run state (e.g. emergency stop). When the FRS input is deactivated again, the inverter either
synchronizes to the free running motor´s current speed or it restarts with an output of 0 Hz depending on
inverter configuration.
Terminal FRS
Motor speed
Run command
via FW or RV
5 4 3 2 1 P24
FR
S
FW
Motor runs free
Restart at 0Hz
Waiting time (set using
b 03 )
Synchronization with
current motor speed
Configuration
b 03 b 88 C 01 – C 05
1) Use function b 88 to configure if the motor is to restart at 0 Hz after the FRS input has been deactivated
(parameter 00, this is the default setting) or if synchronization to the current motor speed should take
place after a certain waiting time (parameter 01). The waiting time can be set using
b 03 .
2) Configure one of the digital inputs 1 – 5 as FRS input by entering the parameter 11 under
C 01
–
C 05
.
EXT: External trip
Terminal function
When a digital input configured as EXT (can be used as an input for e.g. thermo contacts) is activated, then
the inverter enters the trip state with an error indication of
E 12 and stops output. Even when the EXT input
is deactivated again, the trip condition remains. The trip has to be acknowledged by resetting the inverter
(using the RS input or the STOP/RESET key; alternatively the inverter power supply can be switched off and
on).
Terminal EXT
Motor speed
Alarm output terminal
Terminal RS
Free run
Run command
via FW or RV
5 4 3 2 1 P24
EX
T
FW
Configuration
C 01 – C 05
Configure one of the digital inputs 1 – 5 as EXT input by entering the parameter 12 under C 01 – C 05 .
CAUTION After resetting the inverter, the motor starts immediately if a run command (FW or
RV) is being active.