Programming the Control
Signal Terminals
01/02 AWB8230-1413GB
76
Unattended start protection (USP)
If the digital input configured as USP is activated, unattended start
protection is also activated. This prevents a restart of the motor
when the voltage recovers after a mains fault while a start signal
(active signal on FWD or REV) is present. Fault message E13 is
issued. E13 is cancelled by pressing the OFF key or with an active
signal on the RST input. Alternatively, the start signal can be
revoked.
X
Program one of the digital inputs 1 to 5 as USP by setting the
corresponding PNU (C001 to C005) to 13.
Figure 65:
Digital input configured as FWD (start/stop clockwise
operation) and digital input 3 as USP (unattended start
protection).
Figure 66:
Function chart for USP (unattended start protection)
V
N
:Supply voltage
K14: Signalling relay contact K14
f
o
:
Output frequency
a
Revoke start signal (alarm no longer present)
b
Start signal
USP
FWD
P24
FW
3
K14
E13
U
N
USP
FWD/REV
a
b
f
O
Warning!
If unattended start protection is triggered (fault message
E13) and the fault message is acknowledged with a reset
command while a start signal is still active (input FWD or
REV active), the motor will restart immediately.
h
If you issue a start signal within three seconds of
reestablishing the power supply and unattended start
protection is active, the unattended start protection is
also triggered and issues fault message E13. When
unattended start protection is used, you should therefore
wait for at least three seconds before issuing a start signal
to the frequency inverter.
h
Unattended start protection can still be activated when
you issue a reset command through the RST input after an
undervoltage fault message (E09) has occurred.
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