73VR2102 / 73VR2104 / 73VR2106
73VR2108 / 73VR2110 / 73VR2112
– 6 –
• Stabilize the temperature around the terminal block. DO NOT expose the terminal
block in the direct line of air flow from air conditioners, cooling fans, or ventilation fans.
Switching on and off the fans located close to the terminal block affects the ambient
temperature.
• Resistor modules (model: REM3-250) can be connected to the 73VR21x to convert
current inputs into voltage. However, it is not recommended when TC inputs are mixed
because the heat developed on and around the REM3 affects the cold junction com
-
pensation performance. We recommend that REM3 be connected on a separate ter
-
minal board.
• Do not use wires of large diameter which has large heat dissipation. We recommend
using the wires of 0.5 mm
2
(AWG 20) or thinner diameters not only for the thermocouple
channels but for all other screw terminals.
■
CONNECTING OTHER DEVICES IN PARALLEL
• Turn off the burnout function for thermocouple inputs.
• No parallel connection is permitted for RTD.
■
DO NOT APPLY OVERRANGE NORMAL MODE VOLTAGE
• Do not apply voltages exceeding ±20V to terminals B – C for ±3V, ±6V or ±12V ranges
to prevent damage.
• For other ranges, do not apply voltages exceeding ±12V to the same terminals to pre
-
vent damage.
Applying voltages exceeding ±1.5V may affect the measuring accuracies of other chan
-
nels.
■
INTERNAL CLOCK
• The internal clock data is stored in memory powered by a backup battery while the
73VR21x is without external power supply.
• The data will be reset to its default status when the battery is used up while the 73VR21x
is left without power supply for a long time period. The clock adjustment will be neces
-
sary once the power is restored. Please refer to the 73VR21x Users Manual for the
procedure.
• Once the power is restored, the 73VR21x starts recharging the battery. It will be full in
approximately in 36 to 48 hours.
■
AND ....
• We recommend use of an UPS to supply power backups.
• The module is designed to function as soon as power is supplied, however, a warm up
for 10 minutes is required for satisfying complete performance described in the data
sheet.
