Hitachi L100 IP Series, Instruction Manual

Page: 37 / 94

Chapter 7 – Control circuit terminal functions
7-9
USP: Prevention of restart upon power recovery
Terminal function
When a digital input configured as USP is activated, then the inverter won´t restart when power to the
inverter recovers and a running command (activated FW or RV input) is being active at the same time. The
trip
E 13
is output in this case which dissapears when the trip is acknowledged by pressing the RESET key,
activating the RS input, or releasing the running signal again.
Running command
FW or RV
Terminal USP
Output frequency
Power supply
Alarm output
Trip E 13
Deactivate run-
ning command
(stops alarm output)
Running
command
5 4 3 2 1 P24
US
P
FW
Configuration
C 01 – C 05
Configure one of the digital inputs 1 – 5 as USP input by entering the parameter 13 under
C 01
–
C 05
.
WARNING In case of an USP condition (indicated by trip E 13 ), resetting the trip while the
running command (activated FW or RV input) is still active will cause the motor to
restart immediately.
Remarks
•
When a running command is issued within 3 seconds after turning on the power supply with the USP
function being active, the inverter will enter the USP condition and display the trip
E 13 mentioned
above. Consequently, if the USP function is to be used wait at least 3 seconds before sending a running
command to the inverter.
•
The USP function can even be used when a reset command is given via the RS input following an
undervoltage trip (
E 09 ).