Xtralis HeiTel CamDisc HNVR Product Manual page 20

CamDisc HNVR Product Guide
3.7.2 Control Inputs, Error Relay, Sabotage Protection
Control inputs
Depending on control input function and on device configuration, events can be triggered by active switch
l
normally open, active switch normally closed, edge control, or permanent contact.
In principle, control inputs must be switched to ground. Use the ground terminals labelled
l
device, or the ground terminals of the terminal block labelled "common ground for all inputs of type control
input" in the table above.
Status changes at the control inputs - closing and opening of the contact - must have a duration of at least
l
500 ms to allow for positive detection by the device and distinction from "swish contacts".
Standard switching for control inputs
The CamDisc HNVR has a large number of control inputs (Al in, Al a/d, Control in1 to Control in10, Aux in1).
However these inputs are not galvanically isolated from the operating voltage of the device. Depending on the
configuration, these can be activated by "Normally closed" or "Normally opened" contacts.
Note: The control inputs must always be activated such that they are potential-free.
Wiring variants for voltage-monitored control inputs
In addition to standard wiring of control inputs, the CamDisc HNVR permits different types of voltage
monitoring.
Normally terminated (10k)
The wiring variant Normally terminated (10k) allows different circuitry for "Normally opened" and "Normally
closed".
R=10 kΩ
Normally opened
For circuitry with a resistance, a distinction is made between two different states:
Not triggered: The figures show the safe state in each case (not triggered) of the detector line or the
l
control input for the variants "Normally opened" and "Normally closed".
Camera alarm: If the "Normally opened" or "Normally closed" contact is operated, depending on the type
l
of circuit, a camera alarm is activated. Manipulations of the detector line such as interruption or short
circuit cause triggering as soon as the CamDisc HNVR no longer measures the predefined control
resistance of 10 kOhm (±40%).
20
Input circuits of control inputs
Control input
R=10 kΩ Control input
Normally closed
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