Advertisement
Timer Control with Power
Start
Input/Output
To allow for the startup time of peripheral devices (sensors, etc.), the 700-HX
starts timing operation between 200 ms...260 ms after power is turned ON.
For this reason, in operations where timing starts from power ON, the time
display will actually start from 250 ms. If the set value is 249 ms or less, the
time until output turns ON will be a fixed value between 200...250. (Normal
operation is possible for set value of 250 ms or more.) In applications in which
a set value of 249 ms or less is required, use start timing with signal input.
When the 700-HX is used with power start in F mode (i.e., accumulative
operation with output on hold), there will be a timer error (approximately
100 ms each time the 700-HX is turned ON) due to the characteristics of the
internal circuitry. Use the 700-HX with signal start if timer accuracy is
required.
The 700-HX uses transformer-less power supply. When connecting a relay or
transistor as an external signal input device, pay attention to the following
points to prevent short-circuiting due to a sneak current to the transformerless
power supply. If a relay or transistor is connected to two or more timers, the
input terminals of those timers must be wired properly so that they will not
differ in phase, otherwise the terminals will be short-circuited to one another.
Incorrect
Contact or transistor for
external input signal
Correct
Short-circuit current
700-HX
H5CX
Input
Power supply
terminal
Input
terminal
Input
Power supply
terminal
Input
terminal
Publication 700-UM002A-EN-D - July 2001
Precautions
7-3
Advertisement
