Omron H3CR-A Manual page 9

ON Time
The period of time during which a required voltage is being applied
to the operating circuit.
Operating Time
The period of time from the application of a required voltage to the
operating circuit until the completion of the time-limit contact opera-
tion.
Operating Voltage Range
The allowable fluctuation range of such a voltage as control voltage
or signal voltage required to operate a device.
Power Consumption
The maximum wattage used by a device within its operating range
at the specified temperature and humidity.
Depending on the internal power circuit system of the model, both
apparent power and active power are indicated for the AC power
supply. Refer to the apparent power when designing a transformer.
Example: H3CA-8A AC: 10 VA/1 W
Apparent power
Repeat Accuracy
Differences of operating times measured when the timer repeats
operation under the same condition with a given setting time.
Formula for calculation (with operating time measured more than
5 times):
Repeat accuracy
1 T max. -- T min.
= !
x x 100 (%)
2 TMs
where,
T max.: Maximum value of operating times measured at the same
set time
T min.: Minimum value of operating times measured at the same
set time
TMs: Maximum scale time
Since the repeat accuracy is expressed in terms of a percentage
against the maximum setting time, the absolute value of the repeat
accuracy does not change even if the setting time is changed.
Accordingly, the time specification should be taken into account as
much as possible, so that the timer may be used in the vicinity of full
scale.
Repeat Cycle (Cyclic) Operation
The operation to repeat ON/OFF at each given operating time.
Repeat Cycle (Cyclic) Timer
An output signal is generated and removed repetitively according to
the times of the set ON and OFF while a voltage is being applied to
the operating circuit.
T T
Active power
T T
Resetting Time
The period of time from the interruption of the voltage supplied to the
operating circuit during or after the time-limit operation until the re-
turn of the timer to its initial state.
Operating Holding
time time
Self-reset/Power-OFF Reset
To automatically reset the timer by interrupting the voltage being
supplied to the operating circuit.
Setting Error
A difference between the actual operating time and scale time.
Formula for calculation (with operating time measured more than
5 times):
Setting error
TM -- Ts
= x 100 (%)
TMs
where,
TM: Average value of measured operating times
Ts: Set time
TMs: Maximum scale time
Time-limit Contact
The contact that performs time-limit operation.
Time-limit Operation
The operation to obtain an output after the set time by applying the
required voltage to the operating circuit.
Time-limit Reset
To return the timer to the original condition after the set time by
changing the output state from ON to OFF upon application of the
required voltage to the operating circuit.
UP Display Digital Timer
The timer whose display progresses in ascending sequence (from 0
to the set value).
Variation Due to Temperature Change
A change in operating time when the ambient temperature changes
within a permissible range.
Formula for calculation (with operating time measured more than
5 time):
Variation due to temperature change
TMx -- TMs
2 2
= !
x 100 (%)
TMs
where,
TM : Average value of operating times measured at 20"C
2
TMx : Average value of operating times measured at a tempera-
2
ture which causes the maximum deviation from TM
the specified ambient temperature range.
TMs: Maximum scale time
Resetting
time
within
2
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