22 | Cheetah 73LP Product Manual, Rev. E |
6.2.1Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz. Maximum allowed noise values given below are peak to peak measurements and apply at the drive power con- nector.
+5 | V | = | 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz |
+12 | V | = | 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz |
6.2.2Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during
6.2.312 V - Current profile
Figures 3 through 6 identify the drive +12 V current profiles. The current during the various times is as shown:
T0 - Power is applied to the drive.
T1 - Controller self tests are performed.
T2 - Spindle begins to accelerate under current limiting after performing drive internal diagnostics. See Note 1 of Table 2.
T3 - The spindle is up to speed and the head-arm restraint is unlocked.
T4 - The adaptive servo calibration sequence is performed.
T5 - Calibration is complete and drive is ready for reading and writing.
Note. All times and currents are typical. See Table 2 for maximum current requirements.
+12 Volt Current during spindle start – Typical Amperes
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| 2.5 |
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Amperes | 2.0 |
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1.5 |
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| 1.0 |
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| 0.5 |
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| 0.0 |
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| 0.0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 |
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