User's Manual
MS3739
Slim Plug-In Ratio/Bias Converter with Isolated Single/Dual Output
Rev. 1.60
4
9. Mounting / Demounting
Mounting the Socket on a DIN rail
Demounting the Socket
Main Unit Installation / Removal
Fixing Screw
I/O Pins
Installation
(1) Identify the top and the bottom of the unit and insert the I/O pins
straight into the corresponding pin slots (receptacles) on the
socket.
(2) Tighten the fixing screw to fix the unit firmly in position.
Removal
(1) Loosen the fixing screw.
(2) Pull out the unit carefully not to bend the I/O pins.
10. Ratio/Bias Setting
10-1. Ratio Setting
Set the Ratio/Bias Selector Switch to the “RATIO” position, and the
Ratio/Bias Indicator will show the current ratio value. Press the UP
or DOWN switch to change the value as desired.
10-2. Bias Setting
Set the Ratio/Bias Selector Switch to the “BIAS” position, and the
Ratio/Bias Indicator will show the current bias value. Press the UP
or DOWN switch to change the value as desired.
Notes:
- Unless otherwise requested, the ratio and bias will be set to the
factory default settings indicated below:
Ratio = 1; Bias = 0%
- The UP/DOWN switch is of a push button type. Pressing and
holding the switch changes the value faster.
- Setting ranges available are:
Ratio: 0.1 to 4.00 for positive gain; -0.1 to -4.00 for negative gain
(in 0.01 steps)
Bias: -100 to 100% (in 1% steps)
11. LED Status Indicators
The MS3739 has LED status indicators to indicate its status. The
following table shows indicator patterns.
No. Event
Ratio/Bias
Indicator
(7-segment
LED)
Polarity Indicator LED
Output
Recovery
Operation
1
Power ON or
switch operation
Blinks 3 times
(1 s ON - 0.5 s
OFF cycle).
Green LED turns ON
for 1 second, and then
red LED turns ON for
0.5 second. This cycle
is repeated 3 times.
Normal
–
2
Normal operation
OFF
Green LED is ON.
Normal
–
3
Value setting
Set value
Red LED is ON when
the set value is
positive; Green LED is
ON when it is negative.
Normal
–
4
DAC error
Error code: 1
Red LED blinks at 0.25
second intervals.
Typically
0%, but
may vary.
None
5
CRC error of a
set value
Error code: 2
Red LED blinks at 1
second intervals.
0% Reconfig-
uration
6
CRC error of a
compensated
value
Error code: 4
Red LED blinks at 1
second intervals.
0% None
7
System error
Not defined.
Red LED is ON; Green
LED is not defined.
Typically
0%, but
may vary.
None
Notes:
#1: When the Ratio/Bias
Indicator is turned on, a 3-digit number “888” with dots is displayed.
#4-7: Only the last digit is displayed in the event of an error.
#7: The red LED may fail to light up.
Hold the socket with the slide
clamp facing down. Hook the upper
edge of the cavity in the rear of the
socket over the upper blade of the
rail (
①
), then push the lower part of
the socket against the lower blade
of the rail so as to make the slide
clamp engaged firmly with the rail
(
②
).
Push the slide clamp downward with
a flat-head screwdriver bit or the like
(
①
), and pull the lower part of the
socket toward you (
②
).