Omron G3ZA - MANUAL 2 User Manual page 63

Detecting SSR Short-Circuits (4-channel Models Only)
SSR Short-Circuit
Detection Timing
Load current
(SSR output)
G3ZA output
G3ZA alarm
Note
Note
46
A
Note This example shows operation with the following settings:
Abnormal current detection delay = 0 (immediate alarm)
Operation at error = 0 (Continue with error clear)
• An SSR short-circuit is detected at point 1 in the diagram above. The
detection condition is as follows:
Heater OFF current (see note 1)
• The heater short circuit alarm is cleared at point 2 in the diagram above.
The clearing condition is as follows:
Heater OFF current (see note 1) SSR short-circuit detection value - Hys-
teresis (see note 2)
(1) The heater OFF current is the peak load current that flows when the
G3ZA's output is OFF.
(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 SSR short-cir-
cuit detection value
CT 1 to 4 SSR short-circuit
detection value (
els)
83/C3 Hysteresis
If set to 50 A (or 165 A in the
detected. If set to 0 A, detection is forced. Use these settings to confirm oper-
ation during installation.
B
SSR short-circuit detection value.
Setting range
0 to 50 A (See note.) 50 (Disabled)
0 to 165 A, or% (See
mod-
V2 note.)
1 to 10 A, or %
V2
models), SSR short-circuit will not be
Section 4-7
Hysteresis
SSR short-circuit
detection value
Default
165 (Dis-
abled)
1