
DRAW.
No.
TITLE
Pa
e
022
24
DESCRIPTIONDESIGNDATE EDIT
PWM Distribution Module
DESCRIPTIONS
A-72562E-029
FANUC LTD
10.3. Alarms
The PWM Distribution Module (PDM) has the following error detect functions.
Display
number
LED
indication
Alarm massage Description
(
Cause and troubleshooting)
624 1 PDM UNBALANCE ALARM (S1)
625 2 PDM UNBALANCE ALARM (S2)
626 3 PDM UNBALANCE ALARM (S3)
627 4 PDM UNBALANCE ALARM (S4)
628 5 PDM UNBALANCE ALARM (S5)
629 6 PDM UNBALANCE ALARM (S6)
630 7 PDM UNBALANCE ALARM (S7)
631 8 PDM UNBALANCE ALARM (S8)
The value of the current feedback which
returned from the servo amplifier of the
n-th slave connected to PDM is greatly
shifted from average value.
→In the servo amplifier applicable to the
n-th slave, connection (the order of
connection of U, V, and W) of a power
line is wrong, or servo amplifier is out of
order.
622 9 PDM LOCAL FSSB SYN. ERROR There is something wrong with clock
circuit in PDM.
→Replace the PDM
623 A PDM SLAVE NO. SET ERROR The slave number setting (SW1) and
real slave number is miss match.
→ Correct the slave number setting
(SW1)
640 b PDM LOCAL FSSB DISCONNECT The disconnect is detected at the local
FSSB.
→ See the following “Note1”.
NOTE
1. When PDM local FSSB disconnect alarm occurs, “U” or “L” are displayed on the 7 segment LED of
local FSSB servo amplifiers at disconnect point. Using the 7segmant LED display, determine the
disconnect point, and take a proper action.
See the section “troubleshooting of FANUC SERVO AMPLIFIER αi series MAINTENANCE
MANUAL (B-65285E) about the details.
2. When the CNC software corresponding to PDM is not used, the message of the above table is not
displayed.
3. (S1)-(S8) of the item of the alarm message of the above table means SLAVE1-SLAVE8.