Danfoss VLT FC Series Service Guide

Pin
No.
Schematic
acronym
Function Description Reading using a
digital voltmeter
11 VPOS (+)18 V DC
regulated supply
(+)16.5 to 19.5 V
DC
The red LED indicates that voltage is present between VPOS and VNEG
terminals.
(+)18 V DC regulated
supply (+)16.5–19.5 V
DC
12 VNEG (-)18 V DC
regulated supply
(-)16.5 to 19.5 V
DC
The red LED indicates that voltage is present between VPOS and VNEG
terminals.
(-)18 V DC regulated
supply
(-)16.5–19.5 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
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
o
(-)1 V DC=250 V DC
23 VDD (+) 24 V DC
power supply
Yellow LED indicates that voltage is present. (+)24 V DC regulated
supply
(+)23–25 V DC
24 VCC (+) 5.0 V DC
regulated supply.
(+) 4.75 to 5.25
VDC
The green LED indicates that voltage is present. (+)5.0 V DC regulated
supply (+)4.75–5.25 V
DC
25 GUP_T IGBT gate signal,
buered, U 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 at 10 Hz
2.2–2.5 V DC
Equal on all phases
TP25–TP30
26 GUN_T IGBT gate signal,
buered, 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 at 10 Hz
2.2–2.5 V DC
Equal on all phases
TP25–TP30
Special Test Equipment Service Guide
MG94A502 Danfoss A/S © 02/2019 All rights reserved. 127
9 9

Danfoss VLT FC Series Specifications

General

Brand	Danfoss
Model	VLT FC Series
Category	DC Drives
Language	English