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ST11950 and ST12550 Installation Guide, Rev. D 17
DC power requirements
for ST11950W/WD and ST12550W/WD drives
Single-ended Differential
++
++
+5V
++
++
+12V
++
++
+5V
++
++
+12V
Voltage regulation
5
±±
±±
± 5%
±±
±±
± 5%
2
±±
±±
± 5%
±±
±±
± 5%
2
Amps
Maximum operating current
1
1.04 0.95 1.3 0.95
Average idle current
1, 12
0.76 0.83 0.83 0.83
Maximum starting current
Peak DC
3, 6
1.0 2.18 1.1 2.18
Peak AC
3
− 3.1 − 3.1
Delayed motor start (max)
1, 4
1.0 0.19 1.1 0.19
Peak operating current
Typ DC
1, 10
1.03 0.91 1.21 0.91
Max DC
1
1.04 0.95 1.3 0.95
Max (peak) 1.2 1.87 2.0 1.87
Track following (DC)
at OD
1
1.0 0.84 1.1 0.84
at ID
1
1.0 0.9 1.1 0.9
Read track
OD DC
1, 15
1.1 0.85 1.4 0.85
AC 1.3 1.2 2.0 1.2
Seeking
Typical DC
1, 13
1.0 1.2 1.1 1.2
Maximum DC
1
1.1 1.2 1.2 1.2
Maximum (peak) AC 1.2 1.8 2.0 1.8
1
Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
continued