Trane TR150 - Dynamic Test Procedures; No Display Test (Display Is Optional); Input Voltage Test

6.4 Dynamic Test Procedures
NOTICE
Test procedures in this section are numbered for
reference only. Tests do not need to be performed in this
order. Perform tests only as necessary.
WARNING
Never disconnect the input cabling to the frequency
converter with power applied due to danger of severe
injury or death.
CAUTION
Take all the necessary safety precautions for system
start-up before applying power to the frequency
converter.
Dynamic tests are conducted to check the IGBT. The tests
can indicate if an IGBT is faulty. The fault is indicated by a
voltage drop on the terminals UVW.
Preparation:
•
Disconnect the motor from the frequency
converter.
•
Ensure that the frequency converter is powered
up.
•
Program the frequency converter to approxi-
mately 50 Hz on start.
•
Set the multimeter to AC 1000 V.
Procedure for dynamic test on the IGBT.
1. Connect the positive terminal of the multimeter
lead to the U connector, and connect the
negative terminal to the V terminal.
2. Connect the positive terminal of the multimeter
lead to the U connector, and connect the
negative terminal to the W terminal.
3. Connect the positive terminal of the multimeter
lead to the V connector, and connect the
negative terminal to the W terminal.
The meter reading is 450 V ±25 V when performing the
dynamic test at 400 V mains. With PM motors the reading
may dier. Contact hotline for help.
The reading must be within ±1.5%.
6.4.1 No Display Test (Display is Optional)
A frequency converter with no display in the LCP can be
the result of several causes. First, verify that there is no
display. A single character in the display or a dot in the
upper corner of the display indicates a communication
error. Check that all option cards are properly installed.
When this condition occurs, the green power-on LED is
illuminated.
If the LCD display is dark and the green power-on LED is
not lit, proceed with the following tests.
First test for proper input voltage.
6.4.2 Input Voltage Test
1. Apply power to frequency converter.
2. Use the DVM to measure the input mains voltage
between the frequency converter input terminals
in sequence:
L1 to L2
L1 to L3
L2 to L3
For 380 V frequency converters, all measurements must be
within the range of 342–550 V AC. Readings of less than
342 V AC indicate problems with the input mains voltage.
For 525–600 V frequency converters, all measurements
must be within the range of 446–600 V AC. Readings of
less than 446 V AC indicate problems with the input mains
voltage.
In addition to the actual voltage reading, the balance of
the voltage between the phases is also important. The
frequency converter can operate within
specications
as
long as the imbalance of supply voltage is not more than
3%.
calculates mains imbalance per an IEC
specication.
Imbalance=0.67 X (V
max
–V
min
)/V
avg
For example, if 3-phase readings were taken and the
results were 500 V AC, 478.5 V AC, and 478.5 V AC; then
500 V AC is V
max
, 478.5 V AC is V
min
, and 485.7 V AC is V
avg
,
resulting in an imbalance of 3%.
Although the frequency converter can operate at higher
mains imbalances, the lifetime of components, such as DC
bus capacitors, is shortened.
Test Procedures
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