H7ET-NV Omron, H7ET-NV Datasheet - Page 31
![TIME TOTALIZER LCD](/photos/6/44/64473/h7et-nv_sml.jpg)
H7ET-NV
Manufacturer Part Number
H7ET-NV
Description
TIME TOTALIZER LCD
Manufacturer
Omron
Series
H7ETr
Specifications of H7ET-NV
Operating Mode
Accumulative
Output Type
None
Voltage - Supply
None Required (Battery Included)
Termination Style
Screw Terminal
Display Type
LCD Non-Backlit
Input Type
Switch Closure or Transistor Switch
Number Of Digits/alpha
7
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Count Rate
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
H7ET-NV
H7ETNV
Z3004
H7ETNV
Z3004
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
H7ET-NV1
Manufacturer:
Omron Electronics Inc-IA Div
Quantity:
135
7. Press the Reset Key before use (not necessary for H7ER-N,-NV,-
■ PCB-mounting Counter
Power Supply
• Use the power supply within the applicable range indicated by the
• The H7E@-N@P changes its mode as shown below depending on
following waveform, while considering the ripple and voltage fluctu-
ations of the circuit power source.
the applied supply voltage.
NV1). (5)
Approx. 2.6
Approx. 2.2
Voltage
(V)
3.6
3
0
No display
Looks darker
Looks normal
Flashes
(5)
Beyond supply voltage
LCD
Tool
(1)
(1)
Normal operation
Normal operation
No operation
(4)
Internal circuit
operation
(3)
Battery
Applicable
range
Battery life
guideline
(2)
3.6 V
2.6 V
EN/IEC Standards
The count or timer input, reset input, and backlight power supply ter-
minals of the no-voltage input or PNP/NPN universal DC voltage
input models (H7E@-N,-N1, H7E@-NV(-H),-NV1(-H)) are not iso-
lated.
A SELV power supply conforming to Appendix H of IEC61010-1
should be used for the count or timer input, reset input and backlight
power supply terminals. A SELV power supply is a power supply for
which the input and output have double or reinforced insulation, and
for which the output voltage is 30 Vrms with 42.4 V peak or 60 VDC
max. (Only the H7E@-NV@-H has a backlight.)
The terminals for count or timer input and reset input for AC/DC
multi-voltage input models have basic insulation.
Connect the reset input terminals to a device that does not have
exposed current-carrying parts and has basic insulation for 240 VAC.
Others
If the indicator keeps flickering or is OFF, the internal battery may be
close to the end of its service life. In such a case, it is suggested that
the battery be replaced.
Battery Replacement
To prevent unwanted reset when replacing the battery, connect the
new battery before disconnecting the old one. Otherwise, the voltage
supplied to the counter circuit drops, causing the present count value
to reset.
When designing the circuit board, providing two extra terminals for
battery connection will make the switch must simpler. See the sche-
matic diagram below:
Wiring polarity must be carefully observed, in order to prevent per-
manent damage to the Counters. Exercise caution when inserting
the Counter in the socket, to prevent reversed polarity.
H7E@-N@P
H7E@-N@P
31