
3 Wiring and Connection
3.5.1 Reference Input Circuit
3-28
3.5
Examples of Connection to Host Controller
This section provides examples of multi-winding drive unit and I/O signal connections to the host controller.
3.5.1
Reference Input Circuit
(1) Analog Input Circuit
CN1 connector pins 5 and 6 (speed reference input) and pins 9 and 10 (torque reference input) on the multi-
winding drive unit are explained below.
Analog signals are either speed or torque reference signals at the impedance below.
• Reference speed input: Approx. 14 k
Ω
• Reference torque input: Approx. 14 k
Ω
The maximum allowable voltages for input signals is ±12 V.
∗
This wiring example is for forward operation.
(2) Position Reference Input Circuit
CN1 connector pins 7 and 8 (reference pulse input), pins 11 and 12 (reference sign input), and 14 and 15 (clear
input) on the multi-winding drive unit are explained below.
The output circuits for the reference pulse and position error clear signal from the host controller can be either
a line-driver output or open-collector output. The position reference input circuits are shown below by output
type.
Analog Voltage Input Circuit (D/A)
Analog Voltage Input Circuit (Wiring Example)*
Host controller
0 V
SG Approx.14 k
Ω
min.
Multi-winding drive unit
V-REF or
T-REF
D/A
25HP-10B or
equivalent
2 k
Ω
(1/2
W
min.)
Approx.14 k
Ω
min.
1.8 k
Ω
(1/2 W min.)
12 V
0 V
SG
Multi-winding drive unit
V-REF or
T-REF
Line-driver Output Circuit
Open-collector Output Circuit
(Built-in 12-V power supply)
2.8 V
≤
(H level)
−
(L level)
≤
3.7 V
Applicable line
driver:
SN75ALS174
manufactured by
Texas Instruments
or the equivalent
If the above formula is not satisfied,
the inputs to the multi-winding drive
unit will be unstable. Pulses may be
missed from the reference pulse input,
reference inversion may occur for the
reference sign input, and the clear
signal may be OFF for the clear input.
150
Ω
4.7 k
Ω
Host controller
Multi-winding drive unit
1.5 V or
less at ON
Multi-winding drive unit
Host Controller
PL1, PL2, or PL3 terminal
0 V
+12 V
4.7 k
Ω
150
Ω
Approx. 9 mA