Danfoss VLT HVAC Drive FC100 Service Manual page 131

Special Test Equipment
Pin Schemat
No. ic
Acronym
17 FAN_ON
18 HI_LOW
19 SCR_DIS
20 INV_DIS
21
22 UINVEX
23 VDD
24 VCC
25 GUP_T
10 10
26 GUN_T
27 GVP_T
28 GVN_T
29 GWP_T
130
High Power Service Manual for Modular F Frame Drives
Function Description
Pulse train to gate SCR's
8.00
for fan voltage control.
6.00
In sync with line freq.
4.00
2.00
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms
7 trigger pulses at 3Khz
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 The green LED indicates voltage is present.
supply. +4.75-5.25 VDC
IGBT gate signal,
8.00
buffered, U phase,
6.00
positive. Signal
4.00
originates on Control
2.00
Card.
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms
2v/div 100us/div Run@10Hz
IGBT gate signal,
8.00
buffered, U phase,
6.00
negative. Signal
4.00
originates on Control
2.00
Card.
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms
2v/div 100us/div Run@10Hz
IGBT gate signal,
8.00
buffered, V phase,
6.00
positive. Signal
4.00
originates on Control
2.00
Card.
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms
2v/div 100us/div Run@10Hz
IGBT gate signal,
8.00
buffered, V phase,
6.00
negative. Signal
4.00
originates on Control
2.00
Card.
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms
2v/div 100us/div Run@10Hz
IGBT gate signal,
8.00
buffered, W phase,
6.00
positive. Signal
4.00
originates on Control
2.00
Card.
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms
2v/div 100us/div Run@10Hz
MG90K202 - VLT
Reading Using a Digital Voltmeter
5VDC - fans off
Input A
2ms/Div
+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
Input A
Equal on all phases
TP25-TP30
50Us/Div
2.2–2.5 VDC
Input A
Equal on all phases
TP25-TP30
50Us/Div
2.2–2.5 VDC
Input A
Equal on all phases
TP25-TP30
50Us/Div
2.2–2.5 VDC
Input A
Equal on all phases
TP25-TP30
50Us/Div
2.2–2.5 VDC
Input A
Equal on all phases
TP25-TP30
50Us/Div
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