H7CR
H7CR
26
Display
Meaning
Outputs
Recovery
– – – –
Present value
Not
Press RESET key
below minimum
changed. for 1 second or
FFFFFF Present value
reset input.
above maximum
E1
CPU error
OFF
Press RESET key
E2
Memory error
for 1 second.
■
POWER SUPPLY
■
OPERATING ENVIRONMENT
Always isolate the counter from external circuits or short all
terminals before measuring dielectric strength between electric
circuits and non-charged metal parts or performing similar
testing with the counter mounted in a control panel. This is to
prevent internal circuit damage that might occur if the test
voltage enters the counter interior due to withstand-voltage or
insulation failure in control panel devices.
The counter contains a lithium battery, and must never be
incinerated. Dispose of the counter as a noncombustible item.
■
OTHER
When the power turns OFF then ON, the input signal may or
may not be received. The diagram below shows when the input
signal will be received, will not be received or will be unstable.
The unstable period will vary with power supply voltage, and
the load conditions on external power supplies.
For 100 to 240 VAC and 24 VAC/12 to 24 VDC counters, be
sure that the capacity of the external power supply is adequate,
because the power supply may not provide a surge current
sufficient to start the counter due to the switching regulator
contained in the counter's internal circuitry.
Connect the power supply voltage through a relay or switch in
such a way that the voltage reaches a fixed value immediately.
Received
0 to 0.9 s
10 ms
0 to 50 ms
Off
On
Power
supply
Not
received
Input
Not
received
Unstable
■
TRANSISTOR OUTPUT
The transistor output in H7CR counters is optically isolated
from the internal circuitry by a photocoupler, so either NPN or
PNP output is possible.
– – – –:
Displayed for +/– range counters H7CR-C and H7CR-SC when
max. negative value is exceeded.
FFFFFF:
Displayed for +/– range counters H7CR-C and H7CR-SC when
max. positive value is exceeded.
Although the front of the counter resists water and oils and can
be used where subject to these, extended exposure to large
amounts of either can adversely affect internal components.
The counter, input signal lines, and the input device must be
separated as far as possible from any sources of electrical
noise, such as high-voltage power lines. Shielded input signal
lines can also be effective in suppressing noise.
To prevent damage, the exterior of the counter must not be
exposed to organic solvents (e.g., paint thinner or benzene),
strong alkalis, or strong acids.
■
SELF DIAGNOSTIC FUNCTIONS
The displays at right appear when irregularities occur. When
the problems causing these conditions have been cleared, the
preset count value and all outputs will be reset in the same way
as when the Reset key is pressed.
