Variable Frequency Drives; Measurement Conditions - Trane CLCF Climate Changer Manual

Trouble analysis
This section contains information about the following:
• Unit control problems.
• Symptoms, probable causes, and recommended actions.
Sound power levels
Note: Refer to the unit Installation and Operation Manual for AHU unit trouble analysis and other information on
electrical connection. Use the tables in this section to assist in identifying the cause or causes of a malfunction in
Discharge
the unit controls. The column header 'Recommended Action' suggests repair procedures. Some problems may be
caused by software and operator screen settings. These tables are intended as a diagnostic aid only. For detailed

Measurement conditions:

repair procedures, contact your local Trane office.
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
WARNING! Hazardous Voltage with Capacitors!
long) fixed to its discharge opening.
Disconnect all energy sources, including remote disconnects, and discharge all capacitors before servicing.
Fan
Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized.
Unit speed
After power is off, allow five minutes for all motor or compressor start or run capacitors to discharge.
1
FWD 08 2
For Trane provided variable frequency drives wait 20 minutes.
3
1
For other manufacturer's variable frequency drives or energy storing components, refer to the appropriate
FWD 10 2
manufacturer's literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate
3
voltmeter that all capacitors are discharged. Failure to disconnect power and/or discharge capacitors before servicing
1
FWD 12 could result in death or serious injury. 2
3
Note: For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN or
1
PROD-SVB06A-FR.
FWD 14 2
3
WARNING!: Disconnect all energy sources and allow all rotating equipment to stop completely. Allow hot and cool
1
surfaces enough time to reach safe surface temperatures before inspecting or servicing the unit. Failure to do so may
FWD 20 2
3
result in personal injury or death from electrical shock or moving parts.
WARNING!: Disconnect all energy sources prior to access fan sections or ductwork. Even when locked out
Intake
electrically, fans may cause injury or damage if the impeller is subject to 'wind-milling'. The impeller should be
secured to physically restrict rotational movement.
Measurement conditions:
Failure to secure the impeller could cause severe personal injury or death.
Measurements taken at the horizontal air intake.

Variable Frequency Drives

Fan
Unit speed
Variable Frequency Drives (VFD) are used more and more often to control fan speeds in order to optimize the
1
FWD 08 2
operation and the energy consumption of the units.
3
When VFDs are provided and installed by other non-Trane suppliers on site, please follow these specific
1
FWD 10 recommendations to ensure correct and safe operation. 2
3
1. The VFD must be compatible with HVAC applications, such as fans with quadratic torque.
1
FWD 12 2
2. The electric power output of the VFD shall be compatible with the nominal power of the motor.
3
3. The VFD shall be compatible with its environment (IP rate, type of ventilation, ambient temperature,
1
FWD 14 2
electromagnetic environment...)
3
4. All recommendations indicated in the Installation/Operation/Maintenance manual of the VFD manufacturer must
1
FWD 20 2
be respected.
3
Although the use of VFDs does not create any problem, some undesirable phenomena can occurs : vibration,
excessive noise, lower efficiencies, motor overheating...
You can easily check if these problems come from the VFD by connecting the motor directly to the main supply. Most
of the VFD drives available on the market include some specific functions to allow them to overcome these kinds of
problems.
In all cases, read the VFD manual carefully and if necessary contact your local Trane sales office.
AH-SVX03C-GB UNT-PRC002-GB
Power level in dB(A), per Hz frequency band
125 250 500
55 50 42
57 54 47
58 57 50
57 51 45
58 54 48
60 58 50
57 51 45
58 54 48
60 58 50
56 62 50
61 66 55
63 69 58
57 63 51
61 66 55
63 69 58
Power level in dB(A), per Hz frequency band
125 250 500
56 55 55
63 62 60
66 65 63
62 58 55
66 63 60
70 67 63
62 58 55
66 63 60
70 67 63
66 65 65
73 72 69
78 76 73
68 72 64
76 76 68
78 79 71
Factory engineered controls
1000 2000 4000
37 37 31
40 30 38
42 32 40
42 34 33
45 38 39
48 40 42
42 34 33
45 38 39
48 40 42
48 39 38
53 47 46
56 50 50
49 40 39
53 47 46
56 50 50
1000 2000 4000
53 46 45
60 53 53
62 56 55
58 51 48
62 56 55
65 59 59
58 51 48
62 56 55
65 59 59
65 57 50
71 64 59
75 69 64
64 56 52
71 65 61
74 69 66
Overall power
8000 dB(A)
30 46
40 50
43 53
28 48
35 51
39 54
28 48
35 51
39 54
36 56
45 60
49 63
37 57
45 60
49 63
Overall power
8000 dB(A)
42 57
53 64
57 67
44 61
52 66
57 69
44 61
52 66
57 69
46 68
57 74
63 78
50 69
61 75
66 78
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