[DB600] General Instruction Manual
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Measuring input terminal 3.
Maximum permissible input of measuring input terminals are as follows. Pay attention not to
apply the input that exceeds these values. If an input that exceeds the range is applied, the
instrument may be damaged, its performance may deteriorate remarkably or it may malfunction.
Thermocouple, voltage mV :±10V DC or less
Voltage V :±20V DC or less
Resistance thermometer :±5VDC or less
If using a pair of thermocouple wire in parallel, it may have an influence on the measurement.
When it is necessary to operate the instrument in this situation, check for no influence while
operating the instrument before using.
For the thermocouple, wire the thermocouple or compensation lead wire up to the measuring
input terminal of the instrument.
For the resistance thermometer, use the wire with small resistance and the wire with material
that has no resistance difference between 3 wires.
For inputting current (4 to 20mA), attach an external shunt resistor 250Ω (selling separately)
and use measuring range ±5V.
When connecting protection device such as Zenner barrier for input protection, measurement
error may occur. Confirm the combination with protection device and maintain the allowable
signal source resistance and allowable wire resistance of the instrument.
Control output terminal 4.
Between control output 1 (ON-OFF pulse output) and control output 2 (ON-OFF pulse output) is
isolated.
Between control output 1 (current/SSR drive pulse/voltage output), control output 2
(current/SSR drive pulse/voltage output) and transmission signal output is not isolated. Insert
isolator on the outside if necessary.
Use control output terminal in the rating range. If the load other than rating range is connected,
the instrument may be damaged, its performance may deteriorate remarkably or it may
malfunction.
For relay output terminal of ON-OFF pulse output type and ON-OFF servo output type connect
the load through buffer relay.
Moreover, make sure to insert the contact protection element to the coil side of buffer relay for
contact protection of the instrument internal relay and for noise reduction.
Event output (mechanical relay) 5.
Between each event output terminal is isolated.
Use event output terminal in the rating range. If the load other than rating range is applied, the
instrument may be damaged, its performance may deteriorate remarkably or it may malfunction.
For event output terminal, connect the load through buffer relay.
Moreover, make sure to insert the contact protection element to the coil side of buffer relay for
contact protection of the instrument internal relay and for noise reduction.
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