Omron EasySpeed 3G3JE, User Manual

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Chapter 2
2-24
Design
2-2-5 Connecting to a Digital Controller or Temperature
Controller
The 3G3JE provides an interface for connecting to the time-shared proportional pulse output of a
digital controller or temperature controller, so frequency references can be used when these devices
are used.
This section describes how to connect the Inverter to a digital controller.
Note The frequency references for time-shared proportional pulse output and frequency reference
selections cannot be used at the same time. If P11 (Frequency reference selection) is set to
T.C (Temperature controller time-shared proportional pulses), multi-step speed reference 0
(SS0) will be the temperature controller time-proportional pulse input and multi-step speed ref-
erence 1 (SS1) will be ignored.
■
Overview of Operation
The frequency setting is determined based on the ratio of ON time to OFF time within the frequency
reference upper and lower limit range.
• If the ON time is 0% and the OFF time is 100%, the frequency setting will be the frequency refer-
ence lower limit.
• If the ON time is 100% and the OFF time is 0%, the frequency setting will be the frequency refer-
ence upper limit.
For example, if time-shared proportional pulses are input when the frequency reference lower limit is
20 Hz, the upper limit is 60 Hz, the control period is 10 s, the ON time is 2 s, and the OFF time is 8 s,
then the frequency setting will be 28 Hz.
Frequency setting = Frequency reference lower limit + (Frequency reference upper limit
−
Frequency
reference lower limit)
×
(ON time/Control period)
= 20 Hz + (60 Hz
−
20 Hz)
×
(2 s/10 s)
= 20 Hz + 40 Hz
×
0.2
= 28 Hz
● Time Required to Switch Frequency Reference
The frequency of the time-proportional pulse input is calculated based on the ratio between the ON
time and OFF time. At least one time-shared proportional pulse control cycle of the digital controller
or temperature controller is required to switch the 3G3JE’s frequency reference.
■
Digital Controller and Temperature Controller Output Specifications
The digital controller or temperature controller that is connected must have the following output spec-
ifications.
• Relay output models
• Voltage output models (12 V
±
10% output or 24 V
±
10% output)
ON
OFF
2 s (ON time)
10 s (Control period of digital controller)
8 s (OFF time)