Compex Systems AP4530 manual Connectors and grounding Pluggable Phoenix

Important Note: The iDR-switchprovides 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-switchinputs 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.

G 24 23 22 21 20 19 18 17 G 9-16 1-8

	GROUND
DC REFERENCE
VOLTAGE	+10V
	2K2
INTERNAL POWER

		OPTO-ISOLATED SWITCH INPUTS		1-24
		CONTROL
CHAIN
		OPTO-ISOLATED LOGIC OUTPUTS	1-16
			OPEN COLLECTOR
		+10V
OUT DR-LINK	IN	V +16 - +15 - +14 - +13 -	G	9-12	5-8	1-4

G

METAL WALLPLATE

LOCAL EARTH BOND

G

METAL WALLPLATE

CHASSIS EARTH

				INPUTS					SWITCH
									SWITCH
G	8	7	6	5	4	3	2	1	G
G	16	15	14	13	12	11	10	9	G
G	24	23	22	21	20	19	18	17	G

+10V
	2K2
INTERNAL DR-switch CIRCUIT
(1 OF 8 SHOWN)	OPTO

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-switchend only.

If a local ground is not available then use the cable shield to connect the plate to the chassis of the iDR-switchunit 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-switchfrom 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.

iDR-8User Guide 35