Bedienungsanleitung Allen-Heath iDR-8 (Seite 35 von 47) (Englisch)

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iDR-8 User Guide 35

Important Note: The iDR-switch provides contact closure switch inputs and open-

collector logic outputs. How these are wired to external equipment is the responsibility of the installer.

Specification details are provided here for the iDR-switch inputs and outputs. It is important that the

installer is suitably qualified and familiar with external control circuits to be able to work within the

capabilities of the unit. Allen & Heath do not assume responsibility for any damage done to the unit

due to incorrect or faulty connection to external equipment.

Connectors and grounding Pluggable Phoenix

type screw terminal connectors are used for connecting the

external switches and logic to the iDR-switch. Mating plugs

are provided with the unit. Make sure the wire ends are

carefully stripped and inserted into the terminals. Tighten the

screws using the correct slotted screwdriver. To ensure

interference-free operation use shielded cable. Connect the

shields to the chassis ground screw terminals provided next to

each connector. Fit the screws with the shake proof washers

provided.

For operator safety make sure that wall plates and

other control surfaces made from metal are correctly

bonded to ground (earth).

Strap the metal plate to the local ground at the wall box. For

ground isolation between the wall plate and equipment rack

connect the cable shield at the iDR-switch end only.

If a local ground is not available then use the cable shield to

connect the plate to the chassis of the iDR-switch unit as

shown. This is not necessary if the wall plate is made of non-

conductive material such as plastic which insulates it from the

operator.

Using the switch closure inputs The input is

opto-coupled to isolate the iDR-switch from the connected

equipment. It is switched by linking its connector pin to the

ground (‘G’) pin. Use a contact closure such as a momentary

press switch to do this.

The input pin is fed from the internal +10V reference supply

through a 2k2 ohm resistor. Around 5mA maximum current

flows when connected to ground. Combined switch and cable

resistance should not exceed 1k ohm for the switch to activate.

Each 10way connector provides 8 switch inputs. Either pin 1 or

pin 10 ‘G’ may be used as the common switch ground. One

cable can feed this ground to a bank of switches. Two are

shown in the diagram here. Do not use the chassis ground

screw which is for cable shielding and safety earthing only.

For reliable operation we recommend the use of heavy duty

sealed switches.

METAL WALLPLATE

CHASSIS EARTH

METAL WALLPLATE

LOCAL EARTH BOND

SWITCH

43215678GG

12 11 10 913141516GG

20 19 18 1721222324GG

INPUTS

2K2

+10V

OPTO

INTERNAL DR-switch CIRCUIT

(1 OF 8 SHOWN)

+10V

G 20191817 G21222324

V+-G13+-14+-15+-16

GROUND

OUT INDR-LINK

DC REFERENCE

VOLTAGE

INTERNAL POWER

9-16 1-8

9-12 5-8 1-4

+10V

2K2

CONTROL

CHAIN

OPTO-ISOLATED SWITCH INPUTS 1-24

OPTO-ISOLATED LOGIC OUTPUTS 1-16

OPEN COLLECTOR

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