Omron G3ZA - MANUAL 2 User Manual page 54

Detecting Heater Burnouts (4-channel Models Only)
Heater Burnout
Detection Timing
Load current
(SSR output)
G3ZA output
G3ZA alarm
Note
Note
Note This example shows operation with the following settings:
Abnormal current detection delay = 0 (immediate alarm)
Operation at error = 0 (Continue with error clear)
• Heater burnout is detected at point 1 in the diagram above. The detection
condition is as follows:
Heater ON current (see note 1) ≤ Heater burnout detection value.
• The heater burnout alarm is cleared at point 2 in the diagram above. The
clearing condition is as follows:
Heater ON current (see note 1) ≥ Heater burnout detection value + Hyster-
esis (see note 2)
(1) The heater ON current is the peak load current that flows when the
G3ZA's output is ON.
(2) The hysteresis setting applies a dead zone between the detection condi-
tion and clearing condition, which prevents ON/OFF chattering of the
alarm. The same hysteresis setting is used for the heater burnout detec-
tion, heater overcurrent detection, and SSR short-circuit detection func-
tions.
Variable type Parameter name
81/C1 Channel 1 to 4 heater burnout
detection value
CT 1 to 4 heater burnout
detection value (
83/C3 Hysteresis
If set to 0 A, heater burnout will not be detected.
If set to 50 A (or 165 A in the
tings to confirm operation during installation.
A B
Setting range
0 to 50 A (See note.) 0 (Disabled)
0 to 165 A, or %
V2
) (See note.)
1 to 10 A, or %
models), detection is forced. Use these set-
V2
Section 4-5
Hysteresis
Heater burnout
detection value
Default
0 (Disabled)
1
37