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3 replacing battery for absolute encoder, Part replacement schedule, Operating conditions – Yaskawa MP940 User Manual

Page 370

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10.1 Servodrive Inspection and Maintenance

10-3

10

„

Part Replacement Schedule

The following parts are subject to mechanical wear or deterioration over time. To avoid fail-
ure, replace these parts at the frequency indicated.

The parameters of any SERVOPACKs overhauled by Yaskawa are reset to the standard set-
tings before shipping. Be sure to confirm that the parameters are properly set before starting
operation.

Table 10.3 Periodical Part Replacement

Operating Conditions:

• Ambient Temperature: Annual average of 30ºC
• Load Factor: 80% max.
• Operation Rate: 20 hours/day max.

10.1.3 Replacing Battery for Absolute Encoder

If the voltage of the battery for an absolute encoder drops to approx. 2.7 V or less, an Abso-
lute Encoder Battery Alarm (A. 83) will occur in the SERVOPACK. This alarm occurs when
the SERVOPACK receives a signal from the absolute encoder when the power to the SER-
VOPACK is turned ON. Therefore, the SERVOPACK will not give an alarm when the bat-
tery voltage drops below the minimum voltage level while the power is being supplied to the
SERVOPACK.

Refer to

Using the Battery for the SGDH SERVOPACK

in

7.2.3 Initializing the Absolute

Encoder

for the battery type recommended for absolute encoders.

Replace the battery using the following procedure if the battery voltage drops below the
minimum required battery voltage.

Defective Parts in
Unit or on Circuit
Boards

At least once a
year

Check for discoloration,
damage or discontinuities
due to heating.

Contact your Yaskawa
representative.

Part

Standard Replacement

Period

Replacement Method

Cooling Fan

4 to 5 years

Replace with new part.

Smoothing Capacitor

7 to 8 years

Test. Replace with new part if necessary.

Relays

_

Test. Replace if necessary.

Fuse

10 years

Replace with new part.

Aluminum Electrolytic
Capacitor on Circuit Board

5 years

Test. Replace with new circuit board if
necessary.

Item

Frequency

Procedure

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