Manual

4-34 Commissioning
7000-UM150I-EN-P – June 2013 7000 “B” Frame
Table 4.B – SCR Snubber Circuit Resistance and Capacitance Values
Drive Rating
Sharing Resistance
Snubber Resistance
Snubber Capacitance
2400V (6P), 6600V
80 kΩ
45 Ω
0.5 µf
3300V / 4160V
80 kΩ
60 Ω
0.5 µf
2400V (18P)
80 kΩ
60 Ω
0.68 µf
Sharing Resistance
Snubber Resistance
Snubber Capacitor
Testpoint
To Gate
Driver Board
HeatsinkHeatsink
Sharing Resistance
Snubber Resistance
Snubber Capacitor
Testpoint
To Gate
Driver Board
HeatsinkHeatsink
Figure 4.7 – SCR Snubber Circuit Connections
If a device or snubber component is found to be damaged, a detailed
replacement procedure is a located in Chapter 6 – Component
Definition and Maintenance.
SCR Resistance Measurement
Measured Resistance
SCR Anode-Cathode Resistance
(Heatsink to Heatsink)
__________ – __________ kΩ
(Lowest) (Highest)
SCR Gate-Cathode Resistance
(Across SCR Phoenix Connector)
__________ – __________ Ω
(Lowest) (Highest)
Snubber Resistance
(Test Point – Heatsink on Left)
__________ – __________ Ω
(Lowest) (Highest)
Snubber Capacitance
(Test Point – White Wire from Snubber
Phoenix connector on Right)
__________ – __________ µF
(Lowest) (Highest)
Sharing Resistance
(Red Wire from Snubber Phoenix
connector – Heatsink on Left)
__________ – __________ kΩ
(Lowest) (Highest)