Cooper Security M2000 User's Guide download pdf (Page 22)

Introduction Engineering Manual

voltage drop table to calculate the expected voltage drop, simply divide the voltage drop by

two. Figure 6) shows the same three nodes used in the previous example. The A and B network

connections have been doubled up; in order to do so the network cable must have two spare

cores. This method shows that voltage levels at all nodes is at a sufficient level.

Reducing Voltage Drop - Method 2

The second method to reduce voltage drop is to supply the detection devices from separate

cores. This is the preferred method of reducing voltage drop as detectors generally operate at

lower voltages (9.5V). When using this method, the network cable must have two spare cores.

This method shows that voltage levels at all nodes is at a sufficient level.

Control Panel

Network

Voltage at panel Voltage at Node Voltage at Node Voltage at Node

20m

13.02 V13.60 V

Method 2

Method 1

12.64 V 12.45 V

I = 360 mA I = 240 mA

I = 180 mA

A (+)

B (-)

20m 20m

Node 1

AUX

Node = 60mA

Total = 120mA

60mA taken by detectors

Node 2

AUX

Node = 60mA

Total = 120mA

60mA taken by detectors

Node 3

AUX

Node = 60mA

Total = 120mA

60mA taken by detectors

Control Panel

Network

Aux

Voltage at panel

Voltage at Node

Voltage at detectors Voltage at detectors Voltage at detectors

Voltage at Node Voltage at Node

20m

13.02 V

13.02 V 12.64 V 12.45 V

13.60 V

12.64 V 12.45 V

I = 180 mA

I = 120 mA

I = 60 mA

A (+)

B (-)

+Ve

-Ve

20m 20m

Node 1

Node = 60mA

Total = 60mA

Node 2

Node = 60mA

Total = 60mA

Node 3

Node = 60mA

Total = 60mA

60mA taken by detectors60mA taken by detectors60mA taken by detectors

Figure 6) Reducing Voltage Drop - Methods 1 & 2

Remote Power Supplies

When voltage drops cannot be overcome by using the two methods previously described or the

demand on the control panel power supply exceeds its capacity (as documented in the panel's

Installation Instructions

), one or more remote power supplies will need to be installed. The

supply must have a "floating zero rail" if connected to the network, otherwise an earth fault will

occur. Cooper Security also recommend that you use a monitored power supply. The MSPSU

meets both of these requirements. When installing a remote power supply, you should install it

close to the equipment it is powering.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 179 180

Comments to this Manuals

No comments

Cooper Security M2000 User's Guide Page 22

Comments to this Manuals

Related products and manuals for Security access control systems Cooper Security M2000