
B-65150E/04 3. α SERIES PARAMETER ADJUSTMENT
− 47 −
(3) Alarms related to serial communication
These alarms are identified from alarms 4 and 8.
Alarm 4 Alarm 8
DTE CRC STB PRM DTE CRC STB SPD
Description
1
1
1
Communication alarm in serial pulse coder
1
1
1
Communication alarm in separate serial pulse coder
Action: Serial communication is not performed correctly. Check
whether cable connection is correct and whether there is a line
disconnection. If CRC or STBB occurs, the alarm may be
caused by noise. Take noise-preventive measures. If the
alarm is always issued after power is turned on, the pulse
coder, the control board of the amplifier (i Series), or the pulse
module (i Series) may be defective.
(4) Disconnection alarms
These alarms are identified from alarms 1, 2, and 6.
Alarm 1 Alarm 2 6
OVL LVA OVC HCA HVA DCA FBA ALD EXP SFA
Description Action
1110
Hardware disconnection
(separate phase A/B
disconnection)
1
1000
Software disconnection
(closed loop)
2
1001
Software disconnection
(α pulse coder)
3
Action 1: This alarm is issued when the separate phase A/B scale is
used. Check whether the phase A/B detector is connected
correctly.
Action 2: This alarm is issued when the change in position feedback
pulses is relatively small for the change in velocity feedback
pulses. Therefore, with the semi-closed loop, this alarm is
not issued. Check whether the separate detector outputs
position feedback pulses correctly. If the detector outputs
pulses correctly, the alarm is determined to have been
caused by the reverse rotation of only the motor at the start
of machine operation because of a large backlash between
the motor position and scale position.