1-24 Functional Description
7000-TD002A-EN-P – September 2007
Test Modes The PowerFlex 7000 AC drive is provided with test modes to check
the functionality of the drive during commissioning. These test
modes are selected using the parameter Operating Mode in the
Feature Select group. When Test Mode is set to the default value of
Normal, the drive is in the normal operating mode. The parameter
cannot be changed while the drive is running.
Setting Operating Mode to Gate Test allows the gating checks to be
performed on the rectifier and the inverter. Both the input and output
contactors must be open and medium voltage must not be applied to
the drive. This test is carried out in conjunction with two additional
parameters Inv Gating Test and Rect Gating Test. Upon selecting
Gate Test, both the parameters are automatically set to Test Pattern.
A brief description follows in this section.
Setting Inv Gating Test to Test Pattern will fire the inverter devices
in a sequential Z pattern at a low frequency (1Hz) and is verified by
observing the LEDs on the SGCT gate driver board. Setting Inv
Gating Test to Normal Gate will result in the inverter devices firing
as in normal mode of operation. The frequency of the gating is
controlled by parameter Speed Command In (276). Setting Inv
Gating Test to Off stops the inverter test gating sequence.
In 6 or 18-pulse SCR PowerFlex drives, the gate driver boards derive
power from medium voltage. Hence to check the line converter
gating in Gate Test mode where there is no MV available, a special
power harness is required. The line converter gating is quickly
checked by setting the Rect Gating Test to Test Pattern. This will fire
the rectifier devices in a sequential Z pattern at a low frequency (1Hz)
with only one device on at a time and is verified by observing the
LEDs on the SCR gate driver boards. To set the rectifier gating in
normal operation select Normal Gate. The SCR firing is at the input
line frequency.
For 6-pulse PWM drives, no power harness is required as the SGCTs
are powered by the Gate Power Supply.
S H O C K H A Z A R DS H O C K H A Z A R D
Disconnect all ends of cable before applying
medium voltage power. Failure to disconnect
cable before applying medium voltage can
result in damage to equipment, serious personal
injury or death.
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