Moeller DF51 - Automatic Restart after a Fault

10/05 AWB8230-1541GB
Monitoring functions
123
Automatic restart after a fault
With the default settings, each fault triggers a fault message. An
automatic restart is possible after the following fault messages
have occurred:
• Overcurrent (up to three restarting attempts, then fault signal
E 01 to E 04)
• Overvoltage (up to three restarting attempts, then fault signal
E 07 and E 15)
• Undervoltage, intermittent supply voltage failure (up to 16
restart attempts, then fault signal E 09)
When the maximum number of permissible automatic restarts (3
or 6) is reached, the frequency inverter must be restarted.
With PNU b002 and b003, specify the behaviour on mains failure
(a fig. 128 and Fig.129).
Under PNU b004, define how the DF51 frequency inverter
responds to an intermittent power supply failure or undervoltage.
With PNU b005, define whether the DF51 frequency inverter
attempts a restart up to 16 times or indefinitely in the event of an
intermittent power supply failure or undervoltage.
If mains power returns after expiry of the time set with PNU b002
and a start signal is applied, a restart is performed.
Danger!
When a fault has occurred, this function initiates an
automatic restart of the frequency inverter if a start signal
is present after the set waiting time has expired. Ensure
an automatic restart does not present a danger for
personnel.
Figure 128:Supply voltage downtime less than value in PNU b002,
automatic restart
V
LN
:Supply voltage
V
2
:Output voltage
n
M
: Motor speed
t
0
: Duration of supply failure
a Free run stop (coasting)
PNU b002
PNU b003
U
LN
U
2
n
M
t
O
a
Figure 129:Supply voltage downtime greater than value in PNU b002
V
LN
:Supply voltage
V
2
:Output voltage
n
M
: Motor speed
t
0
: Duration of supply failure
a Free run stop (coasting)
PNU b002
U
LN
U
2
n
M
t
O
a