Control Inputs - Bosch PRAESENSA Installation Manual

PRAESENSA
11.5.9

Control inputs

The multifunction power supply provides eight control inputs on a 16‑pole connector. The
control inputs can be configured independently for various actions, with activation on closing
a contact or opening a contact, and with or without interconnection supervision. See the
PRAESENSA configuration manual for all options.
In case no interconnection supervision is configured, just use a switch or a relay output from
another system for activation.
If a control input is used for activation of emergency calls, interconnection supervision is
needed to generate a fault warning in case of an open or shorted circuit. In that case two
resistors with value 10 kohm (0.25 W) must be connected between the cable and the switch.
The resistors are connected in such a way that the control input sees 20 kohm for an open
contact and 10 kohm for a closed contact. In case of a cable interruption, the control input
sees a very high resistance. In case of a cable short‑circuit, the control input sees a very low
resistance. A very high or very low resistance will be interpreted as a fault condition.
Connection procedure, with and without supervision
1.
2.
3.
4.
Bosch Security Systems B.V.
E
1 2
Use a 2‑wire cable, proper for the installation, and the 16‑pole terminal plug (E) delivered
with the device.
Insert the near end wires of the cable into the appropriate slots of terminal plug (E),
preferably using crimped on wire ferrules that fit to the wire gauge used.
– Use a flat blade screw driver to tighten each connection.
No supervision: connect the other side of the cable to the activation switch or voltage
free relay contact.
With supervision: connect the other side of the cable to the combination of activation
switch and two 10 kohm supervision resistors. One resistor is in series with the switch
and one resistor is in parallel with the switch.
Multifunction power supply, large | PRA-MPS3 | en 123
1-8
34
10 k
10 k
Installation manual 2019.11 | V1.00 |