Detecting Ssr Short-Circuits (4-Channel Models Only) - Omron G3ZA - MANUAL 2 User Manual

Detecting SSR Short-Circuits (4-channel Models Only)

Operation after Error
Detection
Calculating the Heater
Overcurrent
Detection Value
4-7

Detecting SSR Short-Circuits (4-channel Models Only)

Setting Procedure
Heaters of 10 A or more: (Normal current - Overcurrent setting) ≥ 9 A
• For a Current Monitor Selector setting of 2 (0% to 100%):
Heaters of less than 10 A: (Normal current - Overcurrent setting) ≥ 4%
Heaters of 10 A or more: (Normal current - Overcurrent setting) ≥ 6%
• Each channel's status can be read individually to check it for heater over-
current detection.
It is possible to select the Controller's operation after a heater overcurrent is
detected.
For details on selecting operation after an error, refer to 4-14 Setting Opera-
tion at Error (4 and 8-channel Models) on page 53.
Set a heater overcurrent detection value appropriate for the customer's appli-
cation.
An SSR short-circuit is detected by determining whether the heater current is
above the SSR short-circuit detection value when a G3ZA control output is
OFF. The abnormal current detection delay can be set to prevent false SSR
short-circuit detection due to noise.
Make the following settings to detect an SSR short-circuit. If these settings are
not made, SSR short-circuits may not be detected properly.
• Wire the CTs.
• Calculate the detection value as described under the heading Calculating
the SSR Short-Circuit Detection Value on page 47, and set the SSR
short-circuit detection value.
• Set the abnormal current detection delay as described in 4-13 Setting the
Abnormal Current Detection Delay (4 and 8-channel Models)
page 52.
Detection will not be stable if the difference is less
than 9 A.
Detection will not be stable if the difference is less
than 4%.
Detection will not be stable if the difference is less
than 6%.
Section 4-7
on
V2
45