successful, the Drive performs a Speed Search (Regardless of the status of b3-01 "Speed Search Selection") from the set
frequency reference and the Auto Restart Attempts count is increased by one. Even if the restart fails the auto restart count
(L5-01) is increased by one as long as the Drive attempted to rotate the motor. The auto restart count will not be incremented if the
restart is not attempted due to a continuing fault condition, (i.e. an OV fault). The Drive will scan for a fault condition every 5 ms.
The auto restart count is reset back to 0 if any of the following occur:
•
No further faults for ten minutes after the last retry.
•
The Drives power is turned off (the Drive must be without power long enough to let control power dissipate).
•
The SHIFT/RESET key is pushed after the last reset attempt.
The setting of parameter L5-02 determines whether the fault output (MA-MB) will be closed during an auto restart attempt.
The setting of L5-02 can be important when interfacing the Drive with other equipment.
The following faults will allow the Auto Restart function to initiate:
•
OC (Overcurrent)
•
LF (Output Open Phase)
•
PF (Input Phase Loss)
•
PUF (DC Bus Fuse)
•
OL1 (Motor Overload)
•
OL3 (Overtorque 1)
•
OL2 (Drive Overload)
•
OL4 (Overtorque 2)
•
OV (DC Bus Overvoltage)
•
GF (Ground Fault)
•
UV1 (DC Bus Undervoltage)
•
RH (Braking Resistor)
•
RR (Braking Transistor)
•
)
OH1 (Overheat
In order for auto restart after a UV1 fault, Momentary Power Loss Ride-thru must be enabled (L2-01= "1: PwrL Ride Thru t",
or "2: CPU Power Active"). Setting H2-01 or H2-02 equal to "1E" configures a digital output as "Restart Enabled" to signal if
an impending auto restart is possible.
Run
OV
Fault
5ms intervals
trying each
between
L5-03 seconds successful
L2-03
Attempts
Count
Voltage
remains high
for a long time,
then reset (1)
and run
Fig. 91 Automatic Restart Timing Diagram
OC
OC
try but failed
L2-03
L2-03
2
1
Drive trips on OC,
resets (2) and tries
again but motor still
shorted, trips again.
Programming 126
t
t
successful
t
3
TIME
t
OC condition
gone, resets (3)
and runs.