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MDS-D2/DH2 Series Instruction Manual
9.4 Troubleshooting for Power Backup System
9.4.2 List of Power Backup Function Alarms
When a power backup function alarm occurs, the power backup unit will notify the alarm to the power supply and will
perform deceleration control. Due to this control, the servo/spindle drive units will decelerate and stop the motors. At the
same time, “Power supply option unit error: Alarm 74” will appear on the NC monitor. As the details of the error status,
the alarm No. is displayed with the LED on the front of the power backup unit. Check the alarm No. and remove the
cause of the alarm according to this list.
(Note 1) "b", "C" and "d" displayed on the power backup unit's LED as a solid light (not flickering) do not indicate an alarm.
(Note 2) Resetting methods
PR: Reset by turning the NC power ON again. This alarm can also be reset with the AR resetting conditions.
AR: Reset by turning the power backup unit power ON again.
NR: Reset with NC reset (Alarms with * must satisfy the resetting conditions)
9.4.3 List of Power Backup Function Warnings
When a power backup function warning occurs, “Power supply option unit error: Warning EF” will appear on the NC
monitor. As the details of the error status, the warning No. is displayed with the LED on the front of the power backup
unit. Check the warning No. and remove the cause of the warning according to this list.
(Note1) Resetting method
*: Automatically reset once the cause of the warning is removed.
No. Name Details Detection period
Reset
method
8 Watchdog The system does not operate correctly. After initialized AR
10 Memory error 1 An internal memory error was detected during the power ON self-check.
At initializing AR
11 Memory error 2 An error was detected in the internal clock signal.
12 Unit ID error An error was detected in the internal hardware ID. At initializing AR
13 A/D converter error
An error was detected in the A/D converter, which is used for detecting
current and voltage.
After initialized AR
18 Function selection error An error was detected in the settings of DIP or rotary switches. At initializing AR
19 External emergency stop setting error
The external emergency stop cancel state was detected although the
external emergency stop input is set as disabled.
After initialized AR
1A Resistor unit connection error Resistor unit disconnection was detected. After initialized AR
1B Capacitor connection error
Non-connection of capacitor was detected although the capacitor unit
connection is set as enabled.
First ready-ON AR
1C Power supply unit Connect error
Communication error was detected in the connection to the power supply
unit.
After initialized PR
50 S/W processing error Software processing has not finished within the specified time. After initialized PR
51 Main circuit error An error was detected in a thyristor or charging circuit. After initialized PR
52 Control power output circuit error
An error was detected in the output changeover relay or power output of the
control power supply.
After initialized PR
53 Resistor unit circuit error
An error was detected in the resistor regeneration transistor or regeneration
output.
After initialized PR
54 Inrush circuit error
An error was detected in the rush circuit relay or rush resistor of the control
power supply.
After initialized PR
55
Over current in control power output
circuit
An excessive current was detected in the control power supply backup output
circuit.
After initialized PR
56 Overheat in control power output circuit An overheat was detected in the control power supply backup output circuit. After initialized PR
58 Resistor unit error
An abnormal resistor unit value was detected during the power ON self-
check.
After initialized PR
90 Over voltage The voltage between L+/L- of the main circuit has exceeded the tolerance. After initialized NR (*)
No. Name Details Detection period
Reset
method
D0 Instantaneous power interruption
- AC power supply voltage decrease was detected.
- Loss of phase was detected.
- Bus voltage decrease was detected.
After initialized *
D1 Over regeneration Over-regeneration detection level exceeded 100%. After initialized *
D5 Resistor unit overheat Thermal error was detected in resistor unit. After initialized *