Pin
No.
Schemat
ic
Acronym
Function
Description
Reading Using a Digital Voltmeter
1
IU1
Current sensed,
U phase, not
conditioned
2000.0
1500.0
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
1 ms/Div
Input A
130BX148.10
Approx 400 mv RMS
@
100% load
.937 VACpeak
@
165% of CT current rating. AC
waveform
@
output frequency of the frequency
converter.
2
IV1
Current sensed,
V phase, not
conditioned
2000.0
1500.0
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
1 ms/Div
Input A
130BX148.10
Approx 400 mv RMS
@
100% load
.937 VACpeak
@
165% of CT current rating. AC
waveform
@
output frequency of the frequency
converter.
3
IW1
Current sensed,
W phase, not
conditioned
2000.0
1500.0
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
1 ms/Div
Input A
130BX148.10
Approx 400 mv RMS
@
100% load
.937 VACpeak
@
165% of CT current rating. AC
waveform
@
output frequency of the frequency
converter.
4
COMMON
Logic common
This common is for all signals.
5
AMBT
Ambient temp.
Used to control FAN high and low fan speeds.
1 VDC approximately equal to 25C
6
FANO
Control Card signal
Signal from the control card to turn the fans on and
off.
0 VDC – ON command
5 VDC – OFF command
7
INRUSH
Control Card signal
Signal from the control card to start gating the SCR
front end
3.3 VDC – SCRs disabled
0 VDC – SCRs enabled
8
RL1
Control Card signal
Signal from Control Card to provide status of Relay 01 0 VDC – Relay active
0.7 VDC – inactive
9
Not used
10
Not used
11
VPOS
+18 VDC regulated
16.5 to 19.5
VDC
The red LED indicates voltage is present between
VPOS and VNEG terminals.
+18 VDC regulated 16.5 to 19.5 VDC
12
VNEG
-18 VDC regulated
supply
-16.5 to 19.5 VDC
The red LED indicates voltage is present between
VPOS and VNEG terminals.
-18 VDC regulated supply
-16.5 to 19.5 VDC
13
DBGATE
Brake IGBT gate pulse
train
20.0
15.0
10.0
5.0
0.0V
-5.0
-10.0
-15.0
-20.0
-400.0 us
20 us/Div.
Input A
130BX150.10
Varies w/ brake duty cycle
Voltage drops to zero when brake is turned off.
Voltage increases to 4.04 VDC as brake duty cycle
reaches max.
14
BRT_ON
Brake IGBT 5V logic
level signal.
20.0
15.0
10.0
5.0
0.0V
-5.0
-10.0
-15.0
-20.0
-400.0 us
20 us/Div.
Input A
130BX151.10
Varies w/ brake duty cycle
5.10 VDC level with the brake turned off. Voltage
decreases to zero as brake duty cycle reaches max.
15
Not used
16
FAN_TST
Control signal for fans
Indicates Fan Test switch is activated to force the fans
on high
+5VDC – disabled
0VDC – fans on high
18
HI_LOW
Control signal from
Power Card
Signal to switch fan speeds between high and low
+5VDC = fans on high,
Otherwise, 0VDC.
19
SCR_DIS
Control signal for SCR
front end
Indicates SCR front end is enabled or disabled.
0.6 to 0.8 VDC – SCRs enabled
0VDC – SCR disabled
20
INV_DIS
Control signal from
Power Card
Disables IGBT gate voltages
5VDC – inverter disabled
0VDC – inverter enabled
21
Not used
Special Test Equipment
High Power Service Manual for Modular F Frame Drives
MG90K202 - VLT
®
is a registered Danfoss trademark
127
10
10