Danfoss VLT FC 103, Service Manual

Page: 125 / 134

Pin
No. Schematic
acronym Function Description Reading using a
digital voltmeter
19 Not used
20 INV_DIS Control signal
from Power Card Disables IGBT gate voltages 5 V DC – inverter
disabled 0 V DC –
inverter enabled
21 Not used
22 UINVEX Bus Voltage
scaled down Signal proportional to UDC 0 V switch must be
off
(-) 1 V DC =250 V DC
23 VDD (+) 24 V DC
power supply Yellow LED indicates voltage is present. (+) 24 V DC regulated
supply (+) 23 to 25 V
DC
24 VCC (+) 5.0 V DC
regulated supply.
(+) 4.75 to 5.25 V
DC The green LED indicates voltage is present. (+) 5.0 V DC
regulated supply (+)
4.75 to 5.25 V DC
25 GUP_T IGBT gate signal,
buffered, U phase,
positive. Signal
originates on the
control card.
8.00
6.00
4.00
2.00
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms 50Us/Div
Input A
130BX153.10
2v/div 100us/div Run@10 Hz
2.2–2.5 V DC
Equal on all phases
TP25-TP30
26 GUN_T IGBT gate signal,
buffered, U phase,
negative. Signal
originates on
control card.
8.00
6.00
4.00
2.00
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms 50Us/Div
Input A
130BX153.10
2v/div 100us/div Run@10 Hz
2.2–2.5 V DC
Equal on all phases
TP25-TP30
27 GVP_T IGBT gate signal,
buffered, V phase,
positive. Signal
originates on
control card.
8.00
6.00
4.00
2.00
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms 50Us/Div
Input A
130BX153.10
2v/div 100us/div Run@10 Hz
2.2–2.5 V DC
Equal on all phases
TP25-TP30
Special Test Equipment Service Manual
MG94A222 Danfoss A/S © Rev. 2014-02-10 All rights reserved. 123
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