Pin No. Schematic
Acronym
Function Description Reading Using a Digital Voltmeter
1 IU1 Current sensed,
U phase, not condi-
tioned
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
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 condi-
tioned
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 sup-
ply +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
12 VNEG -18 VDC regulated sup-
ply
-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
Varies w/ brake duty cycle
Voltage drops to zero when brake is turned off. Volt-
age increases to 4.04 VDC as brake duty cycle rea-
ches max.
14 BRT_ON Brake IGBT 5V logic level
signal.
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
17 FAN_ON Pulse train to gate SCR’s
for fan voltage control.
In sync with line freq.
7 trigger pulses at 3Khz
5VDC - fans off
High Power Service Manual for Unit Sizes 6x
131
10
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