Table of Contents
Advertisement
22
6.2.1
Conducted 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.
+5V
0 to 100 kHz
150mV
100 kHz to 10 MHz
100mV
6.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
6.2.3
Current profiles
Figure 3 identifies the drive +12V current profile and Figure 4 identifies the drive +5V current profile. The cur-
rent 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 internal diagnostics.
T3
Spindle is up to speed and the Head-Arm restraint is unlocked.
T4
The adaptive servo calibration sequence is performed.
Note: All times and currents are typical. See Table 1 for maximum current requirements.
+12 Volt Current during spindle start – Typical Amperes
4.0
A
3.0
2.0
1.0
0.0
T0
T2
T1
0
Figure 3.
Typical Cheetah 73FC drive +12V current profile
+12V (with spindle motor not running)
150mV
100mV
Envelope of waveform
Average value of waveform
T3 T4
4
8
12
Seconds
Cheetah 73FC Product Manual, Rev. C
16
20
24
T5
28
32
Advertisement
Table of Contents
