RMS Technologies IMD 34 W/ POLE DAMPING TECHNOLOGY*NEW* - Manual (Page 22)

RMS Technologies Page 22 Version 1.00
IMD34 / IMDE34 User Manual 4/28/2009
Using more than 5VDC for external supply for the optos
If using more than 5VDC, connect
resistors in series with the opto
supply input, PIN 2. Use the table
below to determine what resistor
to use.
Connect the 5VDC supply ground
terminal to the IMD’s Ground, PIN
9.
Figure 22: Schematic for more than 5VDC
Resistor Values for the Opto Supply
The optocouplers must be powered by an external power supply to maintain isolation. The
Opto Supply for the optocouplers can be between +5 to 24 VDC with respect to the signal
input. It is recommended to use a +5 VDC Opto Supply in order to limit the current going
into the optocouplers to 10 mA. However, if the supply is greater than +5 VDC then a
resistor must be connected in series with each signal line to maintain 10 mA of current
running through the optocouplers (step, direction, and disable lines). Do NOT provide
more than 10 mA or damage may occur to the driver.
Step, Direction, and Disable lines have a 475 ohm internal resistor
Voltage: 5V 10V 12V 15V 24V
Ohms needed: 0 500 668 1000 2000
Wattage rating: 0 ¼ watt ¼ watt ¼ watt ½ watt
Table 6: Required resistance for more than 5VDC on opto supply input
If the desired voltage level is not listed above, below is how to calculate the resistor and
wattage:
Amps
R
Voltage
010 . 0
475
=
+ Ω
or
Ω −






=
475
010 . 0 Amps
Voltage
R
Amps Voltage Power
× =
or
Amps Voltage Wattage 010 .0
Ч =