Danfoss Turbocor TT300 User Manual

42 of 132
M-SV-001-EN Rev.E
Compressor Components
3.4.2 Connections
See Figure 33 (Soft Start Board) for cable
connection locations:
Figure 33 - Soft Start Board
3.4.3 Verification
3.4.3.1 Verifying Soft
Start Voltages
3.4.3.2 Verifying Soft
Start Fuses
1. Before verifying Soft Start voltages, ensure that
the correct 3-phase main AC voltage is present at
the Mains Input terminals.
2. Using the DC bus test harness (see Section 1.9)
with power applied to the compressor, verify that
the expected DC bus voltage is present for the
application. Refer to Table 2 (Expected DC Bus
Voltage).
• No DC voltage may indicate that the Soft Start is
not controlling the SCRs
3. Using the DC bus test harness with power
applied to the compressor, verify that the 15VAC
to the DC/DC converter is present. Output can
range from 12 – 25VAC, depending on primary
input voltage.
• No 15VAC may indicate an open F2 or F4 fuse
• If the 15VAC supply is not present at start-up,
the DC/DC converter will not function
1. Isolate the compressor power as described
in the “Electrical Isolation of the Compressor”
section of this manual.
2. Remove the screws that secure the Soft Start
mounting bracket to the compressor.
3. Lift the Soft Start and turn it over, placing it
board-side up on the AC bus bars.
4. Using a multimeter set for resistance
measurements, place the leads on the ends of the
F1 fuse. The reading should be around 0.25Ω.
• An open F1 fuse may indicate a problem with
the DC/DC
5. Using a multimeter set for resistance
measurements, place the leads on the ends of the
F2 Nano fuse. The reading should be around 1Ω.
• An open F2 fuse may indicate a problem with
NOTE
Fast-acting fuses may show a resistance value other than 0Ω.
J8 - SCR Gate cable connector
F1 - DC Bus fuse
F5 - “B” Phase
Transformer fuse
J6 - Soft Start
ground cable
F2 - Nano fuse
T1 - Transformer
T2 - Transformer
J5 - Cooling Fan connector
J9 - Soft Start Temperature
sensor cable connector
F3 - Nano fuse
Cooling Fan
F4 - “A” Phase
Transformer fuse
High Voltage AC/
DC connector

Danfoss Turbocor TT300 Specifications

General

Brand	Danfoss
Model	Turbocor TT300
Category	Air Compressor
Language	English