Sharp CP-SR421 User Manual download pdf (Page 40)

2. INSTALLATION

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2.6 Parts having service lives

Service lives of the following parts are listed below. However, the service lives vary depending on operation

and environment. If any fault is found in the parts, they must be replaced immediately regardless of their

service lives. For parts replacement, please contact your local sales office.

Part name Life guideline

Smoothing capacitor 10 years

Relay

Number of power-on times: 100,000 times

Number of on and off for STO: 1,000,000

times

Cooling fan

10,000 hours to 30,000 hours (2 years to 3

years)

Absolute position battery Refer to section 12.2.

(1) Smoothing capacitor

The characteristic of smoothing capacitor is deteriorated due to ripple currents, etc. The life of the

capacitor greatly depends on ambient temperature and operating conditions. The capacitor will reach

the end of its life in 10 years of continuous operation in normal air-conditioned environment (40 ÛC

surrounding air temperature or less).

(2) Relays

Contact faults will occur due to contact wear arisen from switching currents. Relays reach the end of

their lives when the power has been turned on 100,000 times, or when the STO has been turned on and

off 1,000,000 times while the servo motor is stopped under servo-off state. However, the lives of relays

may depend on the power supply capacity.

(3) Servo amplifier cooling fan

The cooling fan bearings reach the end of their life in 10,000 hours to 30,000 hours. Normally, therefore,

the cooling fan must be replaced in a few years of continuous operation as a guideline. It must also be

changed if unusual noise or vibration is found during inspection.

The life indicates under the yearly average ambient temperature of 40 ÛC, free from corrosive gas,

flammable gas, oil mist, dust and dirt.

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Sharp CP-SR421 User Manual Page 40