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7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.1 Inspection item
1
2
3
4
5
6
7
8
9
10
2.
Install fans referring to the above figure.
The tightening torque of the fan fixing screws is 0.73 N·m. The tightening torque of the fan block fixing screws is 1.42
to 1.89 N·m.
NOTE
• Installing the fan in the opposite direction of air flow may shorten the converter unit life.
• Ensure that the cables are not caught when the fan is installed.
• Switch OFF the power before starting the fan replacement work.
Smoothing capacitors
A large-capacity aluminum electrolytic capacitor is used for smoothing in the DC section of the main circuit, and an aluminum
electrolytic capacitor is used for stabilizing the control power in the control circuit. Adverse effects from ripple currents
deteriorate capacitors. Replacement intervals of capacitors vary greatly with surrounding temperatures and operating
conditions. Replace them roughly every 10 years when used in normal air-conditioned environments.
Inspecting the product visually:
• Case: Check that the sides and bottom of the capacitor have not ruptured.
• Rubber seal: Check for any noticeable bulging or severe cracks.
• Check for external cracks, discoloration, leakage, etc. It is assumed that the capacitor has reached the end of its remaining
life when its capacity has dropped below 80% of its rated capacity.
NOTE
• The converter unit diagnoses the control circuit capacitor by itself, and estimates its remaining life. (Refer to
Relay output terminals
• The contacts of relays deteriorate over time. To prevent faults from occurring, relays must be replaced when they have
reached the maximum of switching operations (switching life).
• The control terminal block must be replaced in case of failure of the relay connected to the relay output terminals A1, B1,
and C1. (Refer to
.) (After replacing the control terminal block, connect the jumper connector to the correct
position in accordance with the control logic of input signals. (Refer to
.)
Main circuit fuse
Fuses are used in the converter unit. Replacement intervals of capacitors vary greatly with surrounding temperatures and
operating conditions. Replace them roughly every 10 years when used in normal air-conditioned environments.
7.1.7
Removal and reinstallation of the control circuit
terminal block
This product has a removable control circuit terminal block, which can be replaced with a new one.
Removal and reinstallation
1.
Loosen the two installation screws at the both side of the control circuit terminal block. (These screws cannot be
removed.)
Slide down the control circuit terminal block to remove it.
Содержание FR-CC2-N Series
Страница 61: ...60 3 PRECAUTIONS FOR USE OF THE CONVERTER UNIT 3 4 Checklist before starting operation MEMO ...
Страница 137: ...136 5 PARAMETERS 5 10 Checking parameters changed from their initial values initial value change list MEMO ...
Страница 153: ...152 6 PROTECTIVE FUNCTIONS 6 6 Check first when you have a trouble MEMO ...
Страница 165: ...164 7 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 7 2 Measurement of main circuit voltages currents and powers MEMO ...
Страница 171: ...170 8 SPECIFICATIONS 8 3 Outline dimension drawings MEMO ...