Programming 126
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.
Fig. 91 Automatic Restart Timing Diagram
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.
t
t
t
t
Run
Fault
ttempts
Count
L2-03
OV
trying each
L5-03 seconds
successful
1
OC
L2-03
2
Voltage
remains high
for a long time,
then reset (1)
and run
L2-03
3
OC
OC condition
gone, resets (3)
and runs.
successful
try but failed
Drive trips on OC,
resets (2) and tries
again but motor still
shorted, trips again.
TIME
5ms intervals
between
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