
B-65150E/04 3. α SERIES PARAMETER ADJUSTMENT
− 45 −
Action 2: Overheat alarms
If an overheat alarm is issued after long-time continuous operation, the
alarm can be determined to have been caused by a temperature rise in
the motor or amplifier. Stop operation for a while, and see whether the
alarm occurs. If the alarm still occurs after the power is kept off for
about 10 minutes, the hardware may be defective.
If the alarm is issued intermittently, increase the time constant, or
increase the programmed stop time period to suppress temperature rise.
Action 3: OVC alarms
When an OVC alarm is issued, check that standard values are set for the
following parameters. If the parameters are correct, increase the time
constant or increase the programmed stop time period to suppress
temperature rise.
No. 1877 No. 8X62 No. 1878 No. 8X63 No. 1893 No. 8X65
No. 2062 No. 1062 No. 2063 No. 1063 No. 2065 No. 1065
(2) Alarms related to the pulse coder and separate serial pulse coder
(2-1) Built-in pulse coder
These alarms are identified from alarms 1, 2, 3, and 5. The
meanings of the bits are as follows:
Alarm 3 Alarm 5 1 Alarm 2
CSA BLA PHA RCA BZA CKA SPH LDM PMA FBA ALD EXP
Description Action
1
Soft phase alarm
2
1
Clock alarm (serial A)
1
Zero volts in battery
1
1 000
Abnormal speed (serial A)
1 110
Count error alarm
(α pulse coder)
2
1
Phase alarm
2
1
Voltage drop in battery (warning)
1
1
Checksum alarm (serial A)
1
Pulse error alarm
(α pulse coder)
1
LED abnormality alarm
(α pulse coder)
CAUTION
When an emergency stop is released with the power
line to the motor disconnected, an overcurrent alarm
(software) may be issued. If this poses a problem, set
the following parameter bit to 1:
Bit 0 of parameter No. 1747 (Series 15) or bit 0 of
parameter No. 2207: Ignores the overcurrent alarm
(software).