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Alarm Relay
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Original instructions
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Alarm Relay
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Original instructions
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 DANGER |
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LOSS OF ABILITY TO PERFORM SAFETY FUNCTIONS
Always use a redundant device when using the alarm relay in a functional safety application.
Failure to follow these instructions will result in death or serious injury.
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Relay Status
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Conditions
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closed: The alarm relay is closed when all of these conditions are met.
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24V_BAC is OK.
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3V3_BAC is OK.
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ALARM_CPU_N is high(1) or there is no CPU.
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The RESET button is not activated.
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open: The alarm relay is open when any of these conditions is met:
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24V_BAC is not OK.
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3V3_BAC is not OK.
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ALARM_CPU_N is low.(2)
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The RESET button is activated.
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| (1) No CPU blocking errors are detected and the PLC is in RUN mode. (2) A CPU blocking error is detected or the PLC is in STOP mode. | |
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Characteristic
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Description
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rated switching voltage/current
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24 Vdc 2 A (resistive load)
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240 Vac 2 A (cos Φ = 1) point
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minimum switching load
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5 Vdc 1 mA
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maximum switching voltage
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62.4 Vdc
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264 Vac
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contact type
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normally open
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contact time
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OFF → ON: 10 ms or less
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ON → OFF: 12 ms or less
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built-in protection against overload or short circuits:
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none
NOTE: Fit a fast-blow fuse. |
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built-in protection against inductive overvoltage in alternating current:
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none
NOTE: Fit an RC circuit or a MOV [ZNO] suppressor that is appropriate to the voltage in parallel to the terminals of each pre-actuator. |
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built-in protection against inductive overvoltage in direct current:
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none
NOTE: Fit a discharge diode to the terminals of each pre-actuator. |
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dielectric strength
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contact vs. ground: 3000 Vrms, 50 Hz, 1 min.(altitude = 0…2000 m)
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insulation resistance
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100 ΜΩ or more under 500 Vdc
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Electrical
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Alternating current
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200 Vac / 1.5 A
240 Vac / 1 A
cos Φ = 0.7
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≥ 100,000 cycles
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200 Vac / 0.4 A
240 Vac / 0.3 A
cos Φ = 0.7
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≥ 300,000 cycles
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200 Vac / 1 A
240 Vac / 0.5 A
cos Φ = 0.35
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≥ 100,000 cycles
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200 Vac / 0.3 A
240 Vac / 0.15 A
cos Φ = 0.35
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≥ 300,000 cycles
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Direct current
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24 Vdc / 1 A
48 Vdc / 0.3 A
L/R = 7 ms
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≥ 100,000 cycles
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24 Vdc / 0.3 A
48 Vdc / 0.1 A
L/R = 7 ms
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≥ 300,000 cycles
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Mechanical
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20 million cycles
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