GE AF-650 GP Operating Instructions Manual page 133

Pin No. Schematic
Acronym
18 HI_LOW
19 SCR_DIS
20 INV_DIS
21
22 UINVEX
23 VDD
24 VCC
25 GUP_T
26 GUN_T
27 GVP_T
10
28 GVN_T
29 GWP_T
30 GWN_T
132
Function Description
Control signal from Signal to switch fan speeds between high and low
Power Card
Control signal for SCR Indicates SCR front end is enabled or disabled.
front end
Control signal from Disables IGBT gate voltages
Power Card
Not used
Bus Voltage scaled Signal proportional to UDC
down
+24 VDC power supply Yellow LED indicates voltage is present.
+5.0 VDC regulated sup- The green LED indicates voltage is present.
ply. +4.75-5.25 VDC
IGBT gate signal, buf-
fered, U phase, positive.
Signal originates on
Control Card.
2v/div 100us/div Run@10Hz
IGBT gate signal, buf-
fered, U phase, negative.
Signal originates on
Control Card.
2v/div 100us/div Run@10Hz
IGBT gate signal, buf-
fered, V phase, positive.
Signal originates on
Control Card.
2v/div 100us/div Run@10Hz
IGBT gate signal, buf-
fered, V phase, negative.
Signal originates on
Control Card.
2v/div 100us/div Run@10Hz
IGBT gate signal, buf-
fered, W phase, positive.
Signal originates on
Control Card.
2v/div 100us/div Run@10Hz
IGBT gate signal, buf-
fered, W phase, nega-
tive. Signal originates on
Control Card.
2v/div 100us/div Run@10Hz
High Power Service Manual for Unit Sizes 6x
Reading Using a Digital Voltmeter
+5VDC = fans on high,
Otherwise, 0VDC.
0.6 to 0.8 VDC – SCRs enabled
0VDC – SCR disabled
5VDC – inverter disabled
0VDC – inverter enabled
OV switch must be off
- 1 VDC = 450 VDC [T4/T5]
- 1 VDC = 610 VDC [T7]
+24 VDC regulated supply
+23 to 25 VDC
+5.0 VDC regulated supply +4.75 to 5.25 VDC
2.2–2.5 VDC
Equal on all phases
TP25-TP30
2.2–2.5 VDC
Equal on all phases
TP25-TP30
2.2–2.5 VDC
Equal on all phases
TP25-TP30
2.2–2.5 VDC
Equal on all phases
TP25-TP30
2.2–2.5 VDC
Equal on all phases
TP25-TP30
2.2–2.5 VDC
Equal on all phases TP25-TP30