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M-SV-001-EN Rev. G
4.14.2.2 Terminal Block Fuse Installation
1. Place the fuse on the Terminal Block and over the threads on the short bus bar.
2. Install the 5/16 - 18 nut on the load side of the fuse and torque to 20 Nm (15 ft.lb.).
3. Install the 5/16 - 18 fastener on the input side of the fuse and torque to 20 Nm (15 ft.lb.).
4. Install the top covers. Refer to "4.2 Compressor Covers" on page 56.
5. Return the compressor to normal operation.
Table 4-22 Terminal Block Fuse Torque Specifications
Description
Nm
Ft.Lb.
In.Lb.
TTS300/TGS230 Fuse Retaining fastener, 5/16 - 18
20
15
177
TTS300/TGS230 Fuse Retaining nut, 5/16 - 18
20
15
177
Cover fastener, M5x15
1.5
-
13
4.15 Soft Start
There are two (2) different variants of compressor Soft Starts. All Revision G and earlier compressors
had a factory installed Closed-Top Soft Start. Beginning with Revision H compressors, the Open-Top
Soft Start was introduced. There is a significant visual difference between the two (2) variants, refer to
"Figure 4-97 Soft Start Variants" on page 107 for the visual differences.
The Rev A Open-Top Soft Starts can handle all input voltages where as there are distinct versions of the
Closed-Top Soft Starts to handle specific voltages. If a Closed-Top Soft Start must be replaced, Danfoss
LLC offers conversion kits to allow the use of the Open-Top Soft Start. Refer to the Spare Part Selection
Guide for TTS/TGS compressors for kit details.
Figure 4-97 Soft Start Variants
The Soft Start limits in-rush current when power is applied to the compressor by progressively
increasing the conduction angle of the voltage through the SCRs to charge the DC capacitors. It uses a
3-phase voltage input at 50/60Hz, between 380-575VAC, and a DC voltage signal from the SCR output
to generate output pulses of 0-12VDC to the SCR gates for the in-rush current control signal.
Closed-Top Style
Open-Top Style
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