EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company

[ 7 ] Heat sink overheat
Problem Temperature around heat sink has risen abnormally.
Possible Causes
(1) Temperature around the
inverter exceeded the
inverter's specification
range.
What to Check and Suggested Measures
Measure the temperature around the inverter.
Lower the temperature around the inverter (e.g., ventilate the panel where the
inverter is mounted).
(2) Ventilation path is blocked. Check if there is sufficient clearance around the inverter.
Change the mounting place to ensure the clearance.
(3) Cooling fan's airflow volume
decreased due to the
service life expired or failure.
Check if the heat sink is not clogged.
Clean the heat sink.
Check the cumulative run time of the cooling fan. Refer to Chapter 3, Section
3.4.6 "Reading maintenance information – Menu #5 "Maintenance Information"."
Replace the cooling fan.
Visually check whether the cooling fan rotates normally.
Replace the cooling fan.
Inverters of 60 HP or above for three-phase 230 V series and those of 125 HP or
above for three-phase 460 V series are equipped with not only a cooling fan for
heat sink but also an internal air circulation fan. Check the following.
Check the connection of the fan power switching connectors "CN R" and
"CN W."
Correct the connection. (Refer to " Switching connectors" in Chapter 2,
Section 2.3.4 "Wiring of main circuit terminals and grounding terminals".
(4) Overload. Measure the output current.
Reduce the load (e.g. Use the heat sink overheat early warning (E01 through
E07) or the overload early warning (E34) and reduce the load before the
overload protection is activated.).
Decrease the motor sound (carrier frequency) (F26).
Enable the overload prevention control (H70).
(5) Running on single-phase
power
[ 8 ] External alarm
Refer to Section 10.7 "If the Inverter is Running on Single-Phase Power, [ 1 ]
and [ 6 ].
Problem External alarm was inputted (THR).
(when the "Enable external alarm trip" THR has been assigned to any of digital input terminals)
Possible Causes
(1) An alarm function of external
equipment was activated.
(2) Wrong connection or poor
contact in external alarm
signal wiring.
(3) Incorrect setting of function
code data.
[ 9 ] Inverter internal overheat
What to Check and Suggested Measures
Check the operation of external equipment.
Remove the cause of the alarm that occurred.
Check if the external alarm signal wiring is correctly connected to the terminal to
which the "Enable external alarm trip" terminal command THR has been
assigned (Any of E01 through E07, E98, and E99 should be set to "9.").
Connect the external alarm signal wire correctly.
Check whether the "Enable external alarm trip" terminal command THR has
been assigned to an unavailable terminal (with E01 through E07, E98, or E99).
Correct the assignment.
Check whether the normal/negative logic of the external signal matches that of
the THR command specified by any of E01 through E07, E98, and E99.
Ensure the matching of the normal/negative logic.
Problem Temperature inside the inverter has exceeded the allowable limit.
Possible Causes
(1) The surrounding
temperature exceeded the
inverter's specification limit.
(2) Running on single-phase
power
What to Check and Suggested Measures
Measure the surrounding temperature.
Lower the temperature around the inverter (e.g., ventilate the panel where
the inverter is mounted).
Refer to Section 10.7 "If the Inverter is Running on Single-Phase Power," [ 6 ].
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