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senast uppdaterad 2010-06-08 . Med reservation för ev tryckfel.

Solid State- / Halvledarreläer

RA Sense FAQ

We have a couple of questions concerning the RA Sense Relay.

-When do you choose an active high or an active low control input?
-Are there any advantages / disadvantages with the above mentioned matter?
-I have seen in the data sheets (under the control specifications) that the
active low control input has a pick-up voltage that is specified the same
way as the drop-out voltage, i.e.: Vcc-10 VDC.
I can understand the active high control input specifications, but not the mentioned one (active low).
-The corresponding cable, which is the most common one?

1. H/L option

Active high is used when the control signal out of the PLC/control
supply/temperature controller/etc... is a positive signal between 7Vdc and
If the control signal is going to be <0Vdc, then the active low type should
be used. However it gives you the chance that if the control voltage is AT
LEAST 10Vdc less than the supply voltage ( Vcc - 10Vdc) this option can be
used. The reason for this is that the control is taken with respect to the
supply voltage and a transistor lies in between. Thus, the way that this
control transistor is biased must have the base at 10V less than the supply
in order to activate the SSR.

2. Advantages/Disadvantages

These depends on the clients' system. The first important parameter is the
control voltage itself. If it is positive than the H-type must be used
otherwise the L-type must be considered.
Then comes the issue of wiring - if the system has a lot of wiring going to
the negative supply rail, then the customer may want to connect the control
to the negative also and so an L-type will be needed in this case. This is
up to the customer's preference.

3. Pick-up vs drop-out

The active low control voltage needs to be Vcc-10Vdc in order to activate
the SSR's output.To view this more clearly see the following attachement:
(See attached picture)

The supply must be between 20 and 32Vdc in order to stay within
Since the drop out AND pickup depend entirely on the Vcc (i.e. the supply
voltage) than it is very safe to take the pick-up and drop-out voltages to
be the same at Vcc-10Vdc. The range of control voltage for the 20-32Vdc
ranges is shown in the attachment.

4. The cable for the sense relay is the RCS5-200-1. It is a 3m cable with
the female connector at one end and loose wires at the other end in order
for the customer to connect to his equipment.

RA Sense
Solitron Sense

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