IAI Rec, Instruction Manual

Page: 145 / 158

Chapter
7 T
roubleshooting
7.2 EC Gateway Unit Alarm Causes and Countermeasures
ME0394-1A
7-3
Alarm
code
Alarm name Causes/countermeasures
A0
(8A0)
Excessive control power
supply voltage
Cause: Control power supply voltage exceeded the overvoltage
judgment value (120% of 24 VDC = 28.8 V).
1) 24 VDC power supply voltage is high
2) Malfunction of parts inside the gateway unit
3) During acceleration/deceleration or servo ON, etc,,
consumption current rises momentarily. When remote
sensing function is used with power of barely sufficient
current capacity, overvoltage may occur in response to the
current change.
Countermeasure: 1) 2) Check power supply voltage.
3) Consider using a power supply with sufficient
current capacity, or avoid using the remote
sensing function.
If voltage value is normal, contact IAI.
A1
(8A1)
Control power supply
voltage drop
Cause: Control power supply voltage went below the voltage drop
judgment value (70% of 24 VDC = 16.8 V).
1) 24 VDC power supply voltage is low
2) Malfunction of parts inside the gateway unit
Countermeasure: Check power supply voltage.
If voltage value is normal, contact IAI.
A7
(8A7)
External wiring power
supply voltage drop
Cause: Gateway unit control power supply voltage has dropped to or
below 16.8 V (70% of 24 VDC).
1) Control power supply voltage drop
2) Malfunction of parts inside the gateway unit
Countermeasure: 1) Confirm that voltage of 24 VDC ±10% is being
applied to the gateway unit control power
connector. If the voltage is low, the 24 VDC
power supply may have failed.
2) Contact IAI.
BB
(8BB)
RCON-EC Unit Initial
Communication Error
Cause : There was a communication error occurred in the initial
communication in the total frame communication destination
to the EC connection unit.
1) A link connector is not appropriately connected
2) Internal signal line is broke
3) There is no terminal unit mounted, or a terminal unit not
connected properly
4) Communication error due to noise influence
Countermeasure: 1) 2) Check that the link among units is well
established. Disconnect the link among units
once and reconnect it. In case the failure occurs
even after rebooting the power, contact IAI.
3) Mount a terminal unit, or confirm that the
connection of a terminal unit is well established.
4) Take a countermeasure for noise in such a way
as to change the cable layout.
D1
(8D1)
Inapplicable Option Unit
Connected
Cause: An option unit not applicable was connected.
Countermeasure: Connect an option unit that is applicable.