Trouble Shooting At Power On - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
9 Power Backup System

9.4.6 Trouble Shooting at Power ON

If the drive unit does not start up correctly and a system error occurs when the drive unit power is turned ON, the power
backup unit may not have been started up properly. Check the LED display on the power backup unit, and take
measures according to this list.
LED
Symptom
display
None PFU unit fails to start.
Unable to cancel emergency stop.
External emergency stop is occurring
b
on the power supply unit. (The LED on
power supply unit shows "q".）
Unable to cancel emergency stop.
External emergency stop is occurring
1A
on the power supply unit. (The LED on
power supply unit shows "q".）
Unable to cancel emergency stop. The
51 alarm 6C (Power supply: Main circuit
error) is occurring.
52 Power supply or drive unit fails to start.
Unable to cancel emergency stop.
External emergency stop is occurring
d1
on the power supply unit. (The LED on
power supply unit shows "q".）
Unable to cancel emergency stop.
External emergency stop is occurring
d5
on the power supply unit. (The LED on
power supply unit shows "q".）
IB-1501229-F
Cause of occurrence Investigation method
PFU's internal fuse is Check whether the power voltage is
open. properly input to L1, L2 and L3.
Check if the DO3 signal of CN43 is
correctly connected to CN23A of the
power supply unit.
Disconnection of the DO3
signal of CN43.
Check if the 24V power supply of
DO3 signal is correctly connected to
DO_COM terminal.
Disconnection of the
resistor unit or an illegal Check the investigation items of the alarm No. 1A.
resistance value.
PFU's internal resistor Unplug L+/L-, C+/C- and R1/R2
regeneration transistor is from the PFU unit, and measure the
broken. resistance between L+/L- terminals.
PFU's internal resistor Unplug L+/L-, C+/C- and R1/R2
regeneration transistor is from the PFU unit, and measure the
broken. resistance between L+/L- terminals.
An error in the control
Check the investigation items of the alarm No. 52.
power output circuit.
Over-regeneration
Check the investigation items of the warning No. D1.
protection is working.
An overheat was detected
by the thermal sensor of Check the investigation items of the warning No. D5.
the resistor unit.
462
Remedy
If voltage is properly input, replace
the power backup unit.
Connect correctly.
Connect correctly.
If short-circuited, replace the power
backup unit.
If short-circuited, replace the power
backup unit.