Omron G3ZA - MANUAL 2 User Manual page 51

Selecting the CT (4-channel Models Only)
Note
Setting Procedure
1,2,3...
CT Current Monitors
34
(1) The resolution of the monitor display is as follows.
0 to 50 A range selected:
0 to 150 A range selected:
0% to 100% range selected: 2%
(2) The heater burnout detection, heater overcurrent detection, and SSR
short-circuit detection values must be set as percentages.
(3) When the input exceeds the maximum value, the display will overflow at
the maximum value.
Example: If the range is 0 to 50 A and the input is 60 A, the display will
overflow at 55 A.
Example: If the range is 0 to 150 A and the input is 170 A, the display will
overflow at 165 A.
Example: If the range is 0% to 100% and the input is 115%, the display
will overflow at 110%.
When the percentage input is selected, the maximum current value measur-
able with the CT is measured as 100%.
For example, the following percentages will be displayed when a 30-A current
is flowing in the heater.
• If a E54-CT1 (0 to 50 A) CT is being used, 60% is displayed.
• If a G3ZA-CT150L (0 to 150 A) CT is being used, 20% is displayed.
Similarly, the heater burnout detection, heater overcurrent detection, and SSR
short-circuit detection values are also detected as percentages.
The following examples show how to select a suitable CT and set the Current
Monitor Selector.
• Select the CT.
• Detecting current in the 0 to 50 A range
→ Select a CT for 0 to 50 A detection (E54-CT1 or E54-CT3).
• Detecting current in the 0 to 150 A range
→ Select a CT for 0 to 150 A detection (G3ZA-CT150L).
• Set the Current Monitor Selector to match the CT selected above.
• If a CT for 0 to 50 A detection is selected:
→ Set the Current Monitor Selector to 0 (0 to 50 A) or 2 (0% to 100%).
• If a CT for 0 to 150 A detection is selected:
→ Set the Current Monitor Selector to 1 (0 to 150 A) or 2 (0% to 100%).
Example: Setting the Current Monitor Selector to the 0 to 150 A Range
1. Set the Current Monitor Selector to 1 with a Variable Area Write command.
2. After setting the Current Monitor Selector, enable the new setting by exe-
cuting a software reset with an Operation Command or turning the power
OFF and then ON again.
CT for 0 to 50 A Detection (E54-CT1 or E54-CT3) Selected
The following table shows representative currents that are detected.
Current Monitor Selector
setting
Minimum monitored value 0 A
Maximum monitored value 55 A
1 A
3 A
0: 0 to 50 A 1: 0 to 150 A
(See note 1.)
---
10 A ---
50 A ---
---
Section 4-3
2: 0% to 100%
(See note 2.)
0%
20%
100%
110%