Warnings; No Display Text; Input Voltage Test - GE AF-650 GP Operating Instructions Manual

6.3.2 Warnings

Never disconnect the input cabling to the frequency converter with power applied due to danger of severe injury or death.
Take all the necessary safety precautions for system start up prior to applying power to the frequency converter.
For dynamic test procedures, main input power is required and all devices and power supplies connected to mains are energized at rated
voltage. Use extreme caution when conducting tests in a powered frequency converter. Contact with powered components could result in
electrical shock and personal injury.
NB!
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.

6.3.3 No Display Text

A frequency converter with no display can be the result of several causes.
If the LCD display is completely dark and the green power-on LED is not lit, proceed with the following tests.
First test for proper input voltage.

6.3.4 Input Voltage Test

1. Apply power to drive.
2. Use DVM to measure input line voltage between drive input terminals in turn:
L1 to L2
L1 to L3
L2 to L3
For 380 - 480 V drives, all measurements must be within the range of 342 to 528 VAC. Readings of less than 342 VAC indicate problems with the input AC line
voltage. For 525 - 690 V drives, all measurements must be within the range of 446 to 759 VAC. Readings of less than 446 VAC indicate problems with the input
AC line voltage.
In addition to the actual voltage reading, the balance of the voltage between the phases is also important. The drive can operate within specifications as long as
the phase imbalance is not more than 3%.
The line imbalance is calculated per an IEC specification.
Imbalance = 0.67 X (Vmax – Vmin) / Vavg
For example, if three phase readings were taken and the results were 500 VAC, 478.5 VAC, and 478.5 VAC; then 500 VAC is Vmax, 478.5 VAC is Vmin, and 485.7
VAC is Vavg, resulting in an imbalance of 3%.
Although the drive can operate at higher line imbalances, the lifetime of components, such as DC bus capacitors, will be shortened.
High Power Service Manual for Unit Sizes 6x
6
83