Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 15)

HARDWARE DESCRIPTION 4-5
1557-UM050F-EN-P – June 2013
Machine side converter Components
The machine side converter is located in the upper half of the converter cabinet. The machine side
converter consists of three identical cells. each cell consists of the following:
4.4 (A) -machine side converter heatsink stack assemblies
-Gate Turn Off (GTO) thyristors
-heatsinks
-clamp
4.4 (B) -snubber resistors
4.4 (C) -snubber capacitors
4.4 (D) -snubber diode assemblies
- Fast recovery diode
- diode clamp
-snubber capacitors for the snubber diodes
-snubber resistors for the snubber diodes
4.4 (E) -voltage sharing/diagnostic resistors
4.4 (F) -gate driver circuit boards
4.4 (G) -power supply boards
(See Figure 4.4 )
4.4(A)
4.4(E)
4.4(D)
4.4(G)
4.4(C)
4.4(D)
4.4(B)
4.4(F)
Figure 4.4 – Machine Side Converter Components
(2300 V Machine Side Converter shown)
Three of the machine side converter heatsink assemblies (one in each phase) have thermistors mounted
on the heatsinks, each thermistors is wired to a small circuit board (Thermistor Feedback board) which is
located near the gate driver boards. In the event of heatsink overtemperature, a fault signal is sent to the
controller and the drive will shut down.