Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) - Manual (Page 60)

56 Rockwell Automation Publication 7000-IN006B-EN-P - May 2013
Chapter 5 Commissioning the Drive
Resistance Checks
Prior to applying control power to the drive, power semiconductor and snubber
circuit resistance measurements must be taken. Doing so will ensure that no
damage has occurred to the converter section during shipment. The instructions
provided below detail how to test the following components:
• Inverter or AFE Rectifier Bridge
– Anode-to-Cathode Resistance Test (Sharing Resistor and SGCT)
– Snubber Resistance Test (Snubber Resistor)
– Snubber Capacitance Test (Snubber Capacitor)
• SCR Rectifier Bridge
– Anode-to-Cathode Resistance Test (Sharing Resistor and SCR)
– Gate-to-Cathode Resistance Test (SCR)
– Snubber Resistance Test (Snubber Resistor)
– Snubber Capacitance Test (Snubber Capacitor)
SGCT Testing
The following steps outline how to verify SGCT semiconductors and all
associated snubber components. A quick reference to the expected resistance and
capacitance values as well as a simple schematic diagram is located in the table
below. A simple schematic diagram in
Figure 32 on page 57 shows how the
snubber components are connected across a SGCT.
¹— 2300V drives will not have a sharing resistor on devices.
ATTENTION: Before attempting any work, verify that the system has been
locked out and tested to have no potential.
SGCT Rating Sharing Resistor ¹ Snubber Resistor Snubber Capacitor
1500 Amp 80
Ω
6
Ω (AFE Rectifier)
0.2μf
1500 Amp 80
Ω
7.5
Ω (Inverter) 0.2μf
800 Amp 80
Ω
10
Ω
0.1μf
400 Amp 80
Ω
15
Ω (AFE Rectifier)
0.1μf
400 Amp 80
Ω
17.5
Ω (Inverter) 0.1μf