G3PC_07 Datasheet, PDF (3/6 Pages) Omron Electronics LLC – SSR with Failure Detection Function

Operation
I Failure Detection Function
Conditions for SSR Failure Detection
Failure mode
(See note 1.)
Operating input (between
terminals A1 and A2)
Detection time
SSR short-circuit
OFF
SSR half-wave short-circuit OFF
SSR open-circuit
ON
SSR half-wave open-circuit ON
0.5 s max. (See note 2.)
Alarm display
(See note 3.)
Red
Alarm display (between
terminals X1 and X2)
(See note 3.)
Open collector transistor
output
Note: 1. The contents of each of the above failure modes is as follows:
SSR short-circuit: SSR output circuit remains in the ON state.
SSR half-wave short-circuit: SSR output circuit remains in the ON state in one direction.
SSR open-circuit: SSR output circuit remains in the OFF state.
SSR half-wave open-circuit: SSR output circuit remains in the OFF state in one direction.
In addition to the failure modes listed above, detection of circuit disconnections for the load circuit is also possible. (As a rough guide,
circuit disconnection will be detected if the load impedance is greater than or equal to 1 MΩ.)
2. The same power supply is used for both the detection and for the output circuit and so detection is not performed during power interrup-
tions.
3. If power supply (terminal 3) is in the open state, the SSR will still turn ON and OFF in the same way but the failure detection function and
alarm display will not operate properly.
Connection Diagrams (Main Circuit)
The following diagrams show the applicable load connection configurations for SSR failure detection.
Single Phase
3-phase Star
Connection
3-phase Delta
Connection (3-phase,
2-wire Switching)
3-phase V
Connection
G3PC
G3PC G3PC G3PC
G3PC
G3PC
G3PC
G3PC
Heater
Note: With 3-phase connection, so that the power supply voltage is applied between the G3PC’s terminals 1/L1 and 3, connect the desired phase
to terminal 3.
Timing Chart
Main circuit power
supply (load side)
Operating input
(between terminals
A1 and A2)
Input LED
(yellow)
Load current
SSR ON normally SSR OFF normally SSR short-circuit
SSR failure detection
Reset (See note.) SSR open-circuit
Circuit disconnection detection on the load side
Reset (See note.) Load circuit disconnection Reset (See note.)
RDY/ALM LED
(Green: ; Red: )
Alarm output
(between terminals
X1 and X2)
Note: After failure detection, if the detection conditions differ to the conditions given under Conditions for SSR Failure Detection, alarm output is
reset.
SSR with Failure Detection Function G3PC
J-73