Connecting The Load; Selecting Wire Size - TDK-Lambda ZERO-UP 200W User Manual

Programmable dc power supplies constant voltage/constant current built-in rs-232 & rs-485 interface with gpib option
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This power supply is equipped with a three conductor power cable. The third conductor is the ground
conductor. When the cable is plugged-in to an appropriate receptacle, the power supply is grounded.
Under no circumstances should this power supply be operated without an adequate ground
connection. If a two contact receptacle is encountered, it must be replaced by a three contact
receptacle, properly grounded. This operation should be done by a qualified electrician. It is
recommended to keep the AC input wires separate from the DC output and signal wires to avoid
interference.
To meet radiated EMI specification, the EMI suppressor clamp should be attached to the AC cable as
close as possible to the AC inlet of the power supply.
Some components inside the power supply are at AC voltage even when the
On/Off switch is in the "Off" position. To avoid the hazard of electric shock,
disconnect line cord and load and wait 2 minutes before removing cover.

3.7 CONNECTING THE LOAD

Turn off the AC input power before making or changing any rear panel connection.
Make sure that all connections are securely tightened before applying power.
There is a potential shock hazard when using a power supply with a rated output greater than 40V.
Use load wiring with a minimum insulation rating equivalent to the maximum output voltage of the
power supply.

3.7.1 Selecting wire size

Two factors must be considered in selecting wire size.
1. Wires should be at least heavy enough to avoid overheating while carrying the power supply load
current at the rated load, or the current that would flow in the event the load wire were shorted,
whichever is greater.
2. Wire size should be selected to enable voltage drop per lead to be less than 0.5V at the rated current.
It is recommended to minimize voltage drop on the wires to prevent excessive output power
consumption from the power supply.
Please refer to Tables 3-1 and 3-2 for maximum wire length to limit voltage drop by American and
European measurements respectively.
Maximum length in feet -
to limit voltage drop to 0.5V or less
5A
14
2.526
40
12
1.589
63
10
0.9994
100
8
0.6285
160
6
0.3953
253
4
0.2486
400
2
0.1564
640
0
0.0983
1016
WARNING
WARNING
10A
20A
50A
20
10
4
31
15
6
50
25
10
80
40
16
126
63
25
200
100
40
320
160
64
508
254
102
150A
1
1.7
3
5
8
13
21
Table 3-1: Maximum wire length for
34
0.5V drop on lead (in feet)

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