Reducing Voltage Drop - Method 1; Reducing Voltage Drop - Method 2; Remote Power Supplies - Menvier Security TS2500 Installation & Programming Manual

TS2500 Installation Manual
Method 1 20m
Control Panel
I = 540 mA
A (+)
B (-)
Network
Voltage at panel
13.60 V
Method 2 20m
Control Panel
I = 180 mA
A (+)
B (-)
Network
Aux
I = 360 mA
+Ve
-Ve
Voltage at panel
13.60 V

Reducing Voltage Drop - Method 1

The simplest way to reduce voltage drop is to double up
the supply connections (A & B), this will half the
resistance on each core, which will half the voltage
drop. When using the voltage drop table to calculate
the expected voltage drop, simply divide the voltage
drop by two. Figure 2 above shows the same 3 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 2 spare cores. This
method clearly shows that voltage levels at all Nodes is
at a sufficient level.

Reducing Voltage Drop - Method 2

The second way 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 2
spare cores. This method clearly shows that voltage
levels at all Nodes is at a sufficient level.
20m
Node 1
I = 360 mA
Node = 60mA
Total = 180mA
AUX
120mA taken by detectors
Voltage at Node
12.74 V
20m
Node 1
I = 120 mA
Node = 60mA
Total = 60mA
Voltage at Node
13.02 V
I = 240 mA
120mA taken by detectors
Voltage at detectors
12.45 V
Figure 2. Reducing Voltage Drop - Methods 1 & 2
Node 2
Node = 60mA
Total = 180mA
AUX
120mA taken by detectors
Voltage at Node
12.16 V
Node 2
Node = 60mA
Total = 60mA
Voltage at Node
12.64 V
120mA taken by detectors
Voltage at detectors
11.66 V

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 is going to be exceeded
(1.5A max.), one or more remote power supplies will
need to be installed. It is recommended that the
Menvier 519XB is used in these instances as it can be
monitored using the 519FM. When installing a remote
power supply it should be installed close to the
equipment it is powering.
Figure 3 shows two methods of installing a remote
power supply. When connected as shown in method 1,
only the last two Nodes have sufficient voltage levels. If
the power supply is repositioned so that it is next to Node
3 the voltage levels at each Node is increased because
the current being drawn is split into two separate paths
and therefore the voltage drop in each path is
reduced. Method 2 is the preferred connection
method.
System Design
20m
Node 3
I = 180 mA
Node = 60mA
Total = 180mA
AUX
120mA taken by detectors
Voltage at Node
11.87 V
20m
Node 3
I = 60 mA
Node = 60mA
Total = 60mA
Voltage at Node
12.45 V
I = 120 mA
120mA taken by detectors
Voltage at detectors
11.28 V
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