TLR5 TDK Corporation, TLR5 Datasheet - Page 14

• Manufacturer Part Number: TLR5
• Description: RACK 19" FOR TLRBP
• Manufacturer: TDK Corporation
• Series: TLr

Specifications of TLR5

• Accessory Type: Rack System
• External Width: 18.9"
• Rack U Height: 2
• External Depth: 14"
• External Height: 3.45"
• Weight: 7lb
• For Use With: 285-1646 - PWR SUP FNT END 48V 1000W 20A285-1645 - PWR SUP FNT END 24V 1000W 40A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TL Series
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 285-1647

TLR5-S S ERIES POWER SYSTEM
Each system is equipped with 2 unprotected bulk output connections as shown in Figure 4.
Unprotected bulk connections are made with double hole lugs on ¼"-20 studs with 5/8" centers.
The maximum tongue width for bulk connections is a lug at 0.68". Select a wire size for the bulk
outputs according to the current rating as shown in Table 9. Choose lugs and ring terminals
according to section 2.4.2.
2.3.2 DC reference ground
The Lambda Power system is a fully floating system. This means that the output bus bars are not
tied to the chassis or an earth ground. An external reference or earth ground may be connected
to either output bus bar based on the desired polarity of your system. The connection is double
¼"-20 studs with 5/8" centers. As always follow your company's guidelines for sizing and attach-
ing a reference ground.
2.4 DC output wire sizing
There are two main considerations for sizing DC wire; ampacity and voltage drop. Ampacity
refers to a safe current carrying level as specified by non-profit organizations such as
Underwriters Laboratories and the National Fire Prevention Association, which publishes the
National Electric Code. Voltage drop is simply the amount of voltage loss in a length of wire due
to ohmic resistance of the conductor. DC wire may be sized for either ampacity or voltage drop
depending on branch load loop length and conductor heating. In general, ampacity considera-
tions will drive wire selection for short loop lengths (less than 50 feet) and voltage drop will drive
wire selection for long loop lengths (greater than 50 feet). The National Electric Code table
310.16 provides ampacity values for various sizes, bundles, and insulation temperature rated
wire. ALWAYS FOLLOW NEC RULES AND YOUR LOCAL COMPANY PRACTICES WHEN SELECT-
ING DC WIRING AND PROTECTION. Table 9 shows MAXIMUM recommended wire sizes.
2.4.1 DC cable sizing
Unprotected DC output wires shall be based on the total power module capacity of the rack. For
example, using Table 9 below, a system with four TL250048 (48V, 50A) power modules for a
total capacity of 200 A requires two #2 AWG wires.
Page. 14
Revision 1 : January 2006