User`s manual

BD2-1220/1221 User’s Manual
6
3.1.2 Example of Power Connections
* For the serial and parallel interface connections, see the sections dedicated to the respective
interface.
CAUTION:
(1) The ERROR and PEOUT LED lights have a current limiting resistor of 330Ω each to limit driving current to 10 mA.
An LED with forward voltage drop under 2 V should thus be used for these lights. A driving current exceeding 10
mA could damage the control board electronics.
(2) The logic power supply (Vdd and GND) may have supply and return connections only to a single pin each.
However, the driver power supply (Vp and P-GND) must be connected to all the available pins in order to secure
the specified drive current capacity.
(3) As shown above, the LF-SW input connection is a circuit that uses a ceramic capacitor to prevent chattering. You
can adjust the switch if chattering is severe.
(4) The RESET input is pulled up to Vdd with an on-board 3.3KΩ resistor. Leave it at NC if it will not be used.
(5) The serial interface uses RS-232C driver and receiver. Be sure to use RS-232C compatible signal levels for this
interface.
(6) Unused terminals should be insulated to keep exposed cable leads from them.
CN1
1, 2
3, 4
5 ~
10
11 ~
16
17
18
19
330Ω
1000pF
10KΩ
CPU
Vdd
330Ω
Vdd +5V
AC100 ~
240V
GND GND
Vp +24V
P-GND GND
SW
+5V
LF SW
ERROR LED
PEOUT LED
Regulated DC
power supply
+24V
Supply GND or
CN1-3 (4)
5V supply line or
CN1-1 (2)
Control Board