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I have problems triggering a SSR (Solid State Relay) from an industrial robot controller.

Gear

• Solid State Relay  : SSR-40DD
• Power supply  : Beckhoff EL2809 (outputs) + EL1809 (inputs)

Context

• Beckhoff modules are OK  : output is approx. 26V rated for 500mA, it can light up LEDs
• SSR is OK  : it triggers using an external DC power supply, and consumes 24V 20mA
• SSR also work when powered directly by the robot controller PSU (24V 10A) and consumes 24V 20mA

Problem

When powered by the Beckhoff the SSR isn't triggered. On the control side I measure approx. 5.4V and 2.5mA

Troubleshooting

I switched outputs on my Beckhoff, switched SSR (even to another brand), switched robot controller  : always the same result, SSR doesn't trigger through the Beckhoff.

Has anybody got a clue as to what's happening here  ?

Edit  : I corrected my original post because I messed up my current measurements.

My Beckhoff outputs 24V 500mA, but somehow when I plug my SSR the voltage drops to 5.4V and current 2.5mA.
Also the SSR works fine when plugged upstream directly to the robot PSU (24V 10A).
It seems the situation is caused by the Beckhoff.
Wiring has been triple checked and is consistent with 3 other robot controllers we have.

Could the voltage drop be a safety feature of the Beckhoff  ?

I have problems triggering a SSR (Solid State Relay) from an industrial robot controller.

Gear

• Solid State Relay: SSR-40DD
• Power supply: Beckhoff EL2809 (outputs) + EL1809 (inputs)

Context

• Beckhoff modules are OK: output is approx. 26 V rated for 500 mA, it can light up LEDs
• SSR is OK: it triggers using an external DC power supply, and consumes 24 V 20 mA
• SSR also work when powered directly by the robot controller PSU (24 V 10 A) and consumes 24 V 20 mA

Problem

When powered by the Beckhoff the SSR isn't triggered. On the control side I measure approx. 5.4 V and 2.5 mA.

Troubleshooting

I switched outputs on my Beckhoff, switched SSR (even to another brand), switched robot controller: always the same result, SSR doesn't trigger through the Beckhoff.

Has anybody got a clue as to what's happening here?

Edit: I corrected my original post because I messed up my current measurements.

My Beckhoff outputs 24 V 500 mA, but somehow when I plug my SSR the voltage drops to 5.4 V and current 2.5 mA.
Also the SSR works fine when plugged upstream directly to the robot PSU (24 V 10 A).
It seems the situation is caused by the Beckhoff.
Wiring has been triple checked and is consistent with 3 other robot controllers we have.

Could the voltage drop be a safety feature of the Beckhoff?

I have problems triggering a SSR (Solid State Relay) from an industrial robot controller.

Gear

• Solid State Relay : SSR-40DD
• Power supply : Beckhoff EL2809 (outputs) + EL1809 (inputs)

Context

• Beckhoff modules are OK : output is approx. 26V rated for 500mA, it can light up LEDs
• SSR is OK : it triggers using an external DC power supply, and consumes 24V 20mA
• SSR also work when powered directly by the robot controller PSU (24V 10A) and consumes 24V 20mA

Problem

When powered by the Beckhoff the SSR isn't triggered. On the control side I measure approx. 5.4V and 2.5mA

Troubleshooting

I switched outputs on my Beckhoff, switched SSR (even to another brand), switched robot controller : always the same result, SSR doesn't trigger through the Beckhoff.

Has anybody got a clue as to what's happening here ?

I have problems triggering a SSR (Solid State Relay) from an industrial robot controller.

Gear

• Solid State Relay : SSR-40DD
• Power supply : Beckhoff EL2809 (outputs) + EL1809 (inputs)

Context

• Beckhoff modules are OK : output is approx. 26V rated for 500mA, it can light up LEDs
• SSR is OK : it triggers using an external DC power supply, and consumes 24V 20mA
• SSR also work when powered directly by the robot controller PSU (24V 10A) and consumes 24V 20mA

Problem

When powered by the Beckhoff the SSR isn't triggered. On the control side I measure approx. 5.4V and 2.5mA

Troubleshooting

I switched outputs on my Beckhoff, switched SSR (even to another brand), switched robot controller : always the same result, SSR doesn't trigger through the Beckhoff.

Has anybody got a clue as to what's happening here ?

Edit : I corrected my original post because I messed up my current measurements.

My Beckhoff outputs 24V 500mA, but somehow when I plug my SSR the voltage drops to 5.4V and current 2.5mA.
Also the SSR works fine when plugged upstream directly to the robot PSU (24V 10A).
It seems the situation is caused by the Beckhoff.
Wiring has been triple checked and is consistent with 3 other robot controllers we have.

Could the voltage drop be a safety feature of the Beckhoff ?

I have problems triggering a SSR (Solid State Relay) from an industrial robot controller.

Gear

• Solid State Relay : SSR-40DD
• Power supply : Beckhoff EL2809 (outputs) + EL1809 (inputs)

Context

• Beckhoff modules are operational : output is approx. 26V rated for 500mA (I can light up LEDs)
• SSR is operational : tested using an external DC power supply (I can measure the load side resistance go down)

Problem

When the SSR it powered by the Beckhoff, its LED is very dim, and the load side stay isolated.
  On the control side I measure approx. 5.4V and 230mA.

Troubleshooting

I switched outputs on my Beckhoff, switched SSR (even to another brand), switched robot controller : always the same result, SSR doesn't trigger.

Has anybody got a clue as to what's happening here ?

I have problems triggering a SSR (Solid State Relay) from an industrial robot controller.

Gear

• Solid State Relay : SSR-40DD
• Power supply : Beckhoff EL2809 (outputs) + EL1809 (inputs)

Context

• Beckhoff modules are OK : output is approx. 26V rated for 500mA, it can light up LEDs
• SSR is OK : it triggers using an external DC power supply, and consumes 24V 20mA
• SSR also work when powered directly by the robot controller PSU (24V 10A) and consumes 24V 20mA

Problem

When powered by the Beckhoff the SSR isn't triggered. On the control side I measure approx. 5.4V and 2.5mA

Troubleshooting

I switched outputs on my Beckhoff, switched SSR (even to another brand), switched robot controller : always the same result, SSR doesn't trigger through the Beckhoff.

Has anybody got a clue as to what's happening here ?