Panasonic MINAS A6 Multi Series Technical Reference page 301

11.5Protective functions
11.5.2 Details of protective functions
PSM
alarm PSM alarm name
number
01 PSM control power
supply undervoltage
alarm
02 PSM main power supply
overvoltage alarm
05 PSM main power supply
open phase alarm
(To be continued)
11-11
Cause of alarm
The control power voltage of the power supply
module has dropped to below the specified
value.
1) The control power supply voltage (DC24V)
is low:
The occurrence of an instantaneous
power failure, etc.
2) Insufficient control power capacity:
The power supply voltage has dropped
due to the inrush current when the control
power is turned on.
3) Power supply module failure:
Related circuit is broken
The main power supply DC bus voltage
exceeded the allowable input voltage range.
1) The voltage of the converter section
exceeded the specified value.
2) Voltage jumps with phase-advancing
capacitors and UPS (Uninterruptible
Power Supply).
3) Disconnection of external regenerative
resistor.
4) External regenerative resistance is
inappropriate and regenerative energy
cannot be absorbed.
5) Power supply module failure:
Related circuit is broken
A phase failure of the main power supply
connector X102 terminal (L1, L2, L3) was
detected in the main power established state.
1) Disconnection or drop out of L1, L2, and
L3 lines.
2) L1-L2 / L2-L3 / L1-L3 Interphase voltage
imbalance.
3) The main power supply voltage is low.
4) Power supply module failure:
Related circuit is broken
Measures of alarm
Supply the correct voltage to the control power
input (DC 24 V).
1) Measure the voltage at the control power
input connector and check if it is the
specified value:
Check that the control power is not turned
on or off at an extreme slow up / slow
down.
2) Increase the control power capacity:
Try changing the control power.
3) Replace the power supply module.
Supply the correct voltage to the main power
input (AC400V).
In addition, an instantaneous voltage increase
due to regenerative power from the driver
module is avoided.
1) Measure the line voltage of the connectors
X102 terminal (L1, L2, L3) and check for
abnormal voltage fluctuations.
2) Try removing the phase advance capacitor
and UPS.
3) Measure the resistance value of the
external regenerative resistor with a tester.
If it is infinity, it is broken. Replace the
external resistor.
4) Change to the specified regenerative
resistance and power value.
5) Replace the power supply module.
Connect the correct power supply to the main
power input (AC400V).
1) Check the main power input wiring.
2) Measure the line voltage of the main power
input connector (L1, L2, L3). Eliminate
phase voltage imbalance.
3) Check if the line voltage is the specified
value.
4) Replace the power supply module.