Mitsubishi Electric MELSERVO-J4 MR-J4 TM Instruction Manual page 65

2. INSTALLATION
2.6 Restrictions when using the servo amplifiers at altitude exceeding 1000 m and up to 2000 m over sea
level
(1) Effective load ratio and regenerative load ratio
Heat dissipation effects decrease in proportion to decreasing air density, and hence use the servo
amplifiers with the effective load ratio and the regenerative load ratio within the following range.
[%]
100
95
0
0 1000
Altitude
When closely mounting the servo amplifiers, operate them at the ambient temperatures of 0 ˚C to 45 ˚C
or at 75% or smaller effective load ratio. (Refer to section 2.1.)
(2) Input voltage
Generally, withstand voltage decreases as increasing altitude; however, there is no restriction on the
withstand voltage. Use in the same manner as in 1000 m or less. (Refer to section 1.3.)
(3) Parts having service lives
(a) Smoothing capacitor
The capacitor will reach the end of its life in 10 years of continuous operation in air-conditioned
environment (30 ˚C surrounding air temperature or less).
(b) Relays
There is no restriction. Use in the same manner as in 1000 m or less. (Refer to section 2.5.)
(c) Servo amplifier cooling fan
There is no restriction. Use in the same manner as in 1000 m or less. (Refer to section 2.5.)
2000 [m]
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