5.4 SMT Compressor Connection Status Indications
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Disconnected: no connection exists with a compressor or remote compressor host
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Ready to Connect: a connection with a remote host (if applicable) has been established, but no
compressor connection has yet been established
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Compressor is starting up: The currently connected compressor is in startup mode
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Connected: There has been established a connection with a remote host (if applicable) and a
connection with a compressor has been established and verified
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No compressor found: Any serial ports or connections have been established, but a valid
compressor connection was not able to be detected
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Error opening port: There was an error opening the specified serial port (either the port is already in
use, the port name doesn’t exist, or there was some other error attempting to open the serial port)
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Server not found: Could not connect to remote host
5.5 System and Compressor Level Troubleshooting
5.5.1 Compressor Voltage Troubleshooting
1. Carefully, remove the Mains Input Cover.
2. Verify all three (3) phases of voltage before the mains fuses. Refer to Section 4.11.1.1 3-Phase AC input
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If the nameplate rated voltage is present, proceed to Step 3
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If the voltage is (+/- 10%) outside of the nameplate rated voltage, restore correct voltage
3. Verify all three phases of voltage after the mains fuses.
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If the name plate rated voltage is present proceed to Step 4
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If any of the three phases are not present, isolate compressor power then replace the fuses
4. Isolate the compressor power as described in the Section 1.8 Electrical Isolation on page 22.
5. Inspect all electronics for visible damage.
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If no visible damage is present, proceed to Step 6
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If there is any type of visible damage, replace the damaged component(s)
6. Verify all of the Soft Start fuses (Closed Top only). Refer to Section 4.14.2.2 Verifying Soft Start Fuses on
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If all of the fuses are okay, proceed to Step 7
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If any of the fuses are blown, replace the fuse(s) and review the cause of the blown fuses - Refer to
Section 5.5.2.6 Determining the Cause of Blown Soft Start Fuses (Closed-Top Soft Start Only) on
page 272.
7. Verify the Inverter cable to the Inverter connector is installed correctly.
8. Verify the DC-DC Converter resistances. Refer to Section 4.24.2 DC-DC Converter Verification on page
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If DC-DC Converter resistances are correct, proceed to Step 9
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If DC-DC Converter resistances are not correct, replace the DC-DC Converter then verify the PWM
and bearings
9. Install the DC Bus test harness. Refer to Section 1.10.1 General Verification and Installation of the DC
10. Disconnect the J2 (250VDC) and J3 (24VDC) (Potted DC-DC) or J4 (24VDC) Open Frame DC-DC) outputs
from the DC-DC Converter.
11. Install the Top Cover then re-apply the compressor power.
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