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Special Test Equipment
Pin
Schemat
Function
No.
ic
Acronym
1
IU1
Current sensed,
U phase, not
conditioned
2
IV1
Current sensed,
V phase, not
conditioned
3
IW1
Current sensed,
W phase, not
conditioned
4
COMMON
Logic common
5
AMBT
Ambient temp.
6
FANO
Control Card signal
7
INRUSH
Control Card signal
8
RL1
Control Card signal
9
Not used
10
Not used
11
VPOS
+18 VDC regulated
supply +16.5 to 19.5
VDC
12
VNEG
-18 VDC regulated
supply
-16.5 to 19.5 VDC
13
DBGATE
Brake IGBT gate pulse
train
14
BRT_ON
Brake IGBT 5V logic
level signal.
15
Not used
16
FAN_TST
Control signal for fans
18
HI_LOW
Control signal from
Power Card
19
SCR_DIS
Control signal for SCR
front end
20
INV_DIS
Control signal from
Power Card
21
Not used
High Power Service Manual for Modular F Frame Drives
Description
Input A
2000.0
1500.0
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
1 ms/Div
Approx 400 mv RMS @100% load
Input A
2000.0
1500.0
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
1 ms/Div
Approx 400 mv RMS @100% load
Input A
2000.0
1500.0
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
1 ms/Div
Approx 400 mv RMS @100% load
This common is for all signals.
Used to control FAN high and low fan speeds.
Signal from the control card to turn the fans on and
off.
Signal from the control card to start gating the SCR
front end
Signal from Control Card to provide status of Relay 01 0 VDC – Relay active
The red LED indicates voltage is present between
VPOS and VNEG terminals.
The red LED indicates voltage is present between
VPOS and VNEG terminals.
Input A
20.0
15.0
10.0
5.0
0.0V
-5.0
-10.0
-15.0
-20.0
-400.0 us
20 us/Div.
Varies w/ brake duty cycle
Input A
20.0
15.0
10.0
5.0
0.0V
-5.0
-10.0
-15.0
-20.0
-400.0 us
20 us/Div.
Varies w/ brake duty cycle
Indicates Fan Test switch is activated to force the fans
on high
Signal to switch fan speeds between high and low
Indicates SCR front end is enabled or disabled.
Disables IGBT gate voltages
®
MG90K202 - VLT
is a registered Danfoss trademark
Reading Using a Digital Voltmeter
.937 VACpeak @ 165% of CT current rating. AC
waveform @ output frequency of the frequency
converter.
.937 VACpeak @ 165% of CT current rating. AC
waveform @ output frequency of the frequency
converter.
.937 VACpeak @ 165% of CT current rating. AC
waveform @ output frequency of the frequency
converter.
1 VDC approximately equal to 25C
0 VDC – ON command
5 VDC – OFF command
3.3 VDC – SCRs disabled
0 VDC – SCRs enabled
0.7 VDC – inactive
+18 VDC regulated supply +16.5 to 19.5 VDC
-18 VDC regulated supply
-16.5 to 19.5 VDC
Voltage drops to zero when brake is turned off.
Voltage increases to 4.04 VDC as brake duty cycle
reaches max.
5.10 VDC level with the brake turned off. Voltage
decreases to zero as brake duty cycle reaches max.
+5VDC – disabled
0VDC – fans on high
+5VDC = fans on high,
Otherwise, 0VDC.
0.6 to 0.8 VDC – SCRs enabled
0VDC – SCR disabled
5VDC – inverter disabled
0VDC – inverter enabled
10
10
127
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