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