User's Manual
MS3727
Slim Plug-In Signal Selector
Rev. 1.50
2
On Wiring:
Connections to the instrument should be made to the terminal
block. For assignment of the terminals, refer to section 6. The
recommended screwing torque is 0.8 to 1.0 Nm.
For lead wires, use a highly flexible stranded conductor. The
recommended nominal cross-section of the lead wire conductor
is 0.5 to 2.0 mm
2
.
The connection of the lead wire to the terminal block should be
made with the insulated crimp terminal attached to the end of the
wire. Without the insulation, short circuit or electric shock may
occur. The recommended thickness of the crimp terminal is 0.7
to 1.0 mm.
Note that only up to two (2) crimp terminals can be connected to
one (1) terminal screw. In this case, the thickness of the crimp
terminal should be not greater than 0.8 mm.
φ3.7
6.8
m
ax
.
3.4 max.
4.6 min.
To Avoid Erroneous Measurements:
In order to reduce the influence of noise, the input/output wire
and power supply wire should not be used in a same bundle or
same conduit. They should be installed separately with a
minimum distance of 200 mm.
Avoid wiring the signal lines in the vicinity of equipment
generating magnetic fields or electromagnetic waves, such as
electric motors and large-scale transformers. If inevitable,
anti-noise measures such as employment of shielded wires are
indispensable.
At least 30 minutes of warm-up is required prior to operation.
Any sensor or equipment to be connected to the instrument
should be selected in consideration of the input/output
impedance of the same. (For detailed specifications, refer to
section 4 or the relevant product specification sheet that can be
downloaded from our website at https://www.mtt.co.jp.)
4. About the Product
The MS3727 switches between two DC voltage or current input
signals by switching input.
Features:
Pin and socket contacts are gold-plated (0.2
μ
m) to ensure high
reliability and long-term stability.
High dielectric strength of 2,000 VAC between input, [output 1,
output 2], power, and ground.
The power unit can deliver AC power ranging from 85 to 264V
steplessly without switching to meet varied power requirements.
Plug-in type for better maintainability
Drop-proof terminal screws for ease and safety of installation
Fuse installed in the power line as standard.
Specifications
Input Signal
2 channels (INPUT-1, INPUT-2)
Shunt Resistor
DC current signal (shunt resistor 50
Ω
): Built in
Allowable Input
Range
DC current input: ±50mA max.
(Minimum span: 1mA)
DC voltage input: ±50V max.
(Minimum span: 10mV)
Switching Input
Dry contact (Internal pull-up: 24 VDC @ 10mA)
Output Signal
DC current signal or DC voltage signal:
Equivalent to the input signal level
DC current signal (shunt resistor 50
Ω
): Input
signal × shunt resistor (50
Ω
)
Note: Either INPUT-1 or INPUT-2 is output.
Operation
When the power is ON and the switching input
is ON, INPUT-1 is output.
When the power is ON and the switching input
is OFF, INPUT-2 is output.
When the power is OFF, both INPUT-1 and
INPUT-2 give no output.
Accuracy Rating
DC current signal (shunt resistor 50
Ω
): ±0.1%
(accuracy of shunt resistor)
Temperature
Effect
DC current signal (shunt resistor 50
Ω
):
±25ppm/°C
Response Time 5ms max.
Internal
Resistance
between Input
and Output
50
Ω
max. per wire
(ON resistance of photo MOS relay)
Condition of
Non-selected
Input Channel
DC voltage input: Open (leakage current 1µA
max.)
DC current input: 50
Ω
max. (due to the ON
resistance of photo MOS relay)
DC current input (shunt resistor 50
Ω
): Shunt
resistor 50
Ω
Note: When the power is off, the
above-described condition applies to both
channels.
Insulation
Resistance
100M
Ω
min. (@ 500V DC) between [input,
output], switching input, power, and ground.
Dielectric
Strength
[Input, Output] / Switching Input / [Power,
Ground]: 2000V AC for 1 minute (Cutoff
current: 0.5mA)
Power / Ground: 2000V AC for 1 minute (Cutoff
current: 5mA)
Surge Withstand
Capability
Tested as per ANSI/IEEE C37.90.1-1989.
Storage
Temperature
-10 to 60°C
Installation Position
Typical Installation Example