Panasonic MINAS A6 Series, Technical Reference

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