Danfoss VLT FC Series Service Manual page 129

Special Test Equipment
Pin Schematic Function
No. acronym
11 VPOS (+)18 V DC
regulated supply
(+)16.5 to 19.5 V
DC
12 VNEG (-)18 V DC
regulated supply
(-)16.5 to 19.5 V
DC
13 Not used
14 Not used
15 Not used
16 Not used
17 Not used
18 Not used
19 Not used
20 INV_DIS Control signal
from power card
21 Not used
22 UINVEX Bus voltage scaled
down
23 VDD (+) 24 V DC
power supply
24 VCC (+) 5.0 V DC
regulated supply.
(+) 4.75 to 5.25
VDC
25 GUP_T IGBT gate signal,
buffered, U phase,
positive. Signal
originates on
control card.
26 GUN_T IGBT gate signal,
buffered, U phase,
negative. Signal
originates on
control card.
MG94A502
Service Guide
Description
The red LED indicates that voltage is present between VPOS and VNEG
terminals.
The red LED indicates that voltage is present between VPOS and VNEG
terminals.
Disables IGBT gate voltages.
Signal proportional to UDC.
Yellow LED indicates that voltage is present.
The green LED indicates that voltage is present.
Input A
8.00
6.00
4.00
2.00
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms 50Us/Div
2v/div 100us/div Run at 10 Hz
Input A
8.00
6.00
4.00
2.00
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms 50Us/Div
2v/div 100us/div Run at 10 Hz
Danfoss A/S © 02/2019 All rights reserved.
Reading using a
digital voltmeter
(+)18 V DC regulated
supply (+)16.5–19.5 V
DC
(-)18 V DC regulated
supply
(-)16.5–19.5 V DC
5 V DC – inverter
disabled
0 V DC – inverter
enabled
0 V switch must be
9
off
(-)1 V DC=250 V DC
(+)24 V DC regulated
supply
(+)23–25 V DC
(+)5.0 V DC regulated
supply (+)4.75–5.25 V
DC
2.2–2.5 V DC
Equal on all phases
TP25–TP30
2.2–2.5 V DC
Equal on all phases
TP25–TP30
127
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