Tweco CutMaster 101 with SL100SV - Manual (Page 93)

Manual 0-4642 5-29 SERVICE
5
D. Main Input Power Test
WARNING
The following tests must be performed with the power supply connected to primary input power. There are extremely
dangerous voltage and power levels present inside this unit. Do not attempt to diagnose or repair without proper
training in power electronics measurement and troubleshooting techniques.
Reconnect power and observe proper start-up procedure. AC indicator on the Front Panel should be ON. If indicator is OFF there
is no voltage to the Power Supply or an overvoltage condition exists.
1. If AC indicator on Front Panel is OFF, check for proper AC input voltage between input cables on the Main Contactor.
Input voltage should be as shown in the following chart. If not, check for proper voltage at the main power source.
Nominal
Input Voltage
Contactor
Points
Voltage
Range
208/230VAC L1, L2 187-253VAC
400VAC L1, L3 360-440VAC
415VAC L1, L3 370-460VAC
460VAC L1, L3 414-506VAC
600VAC L1, L3 517-632 VAC
Contactor Voltage Readings
Art # A-03194
Main Contactor
#13
#5
L1 L2 L3
T1
T2
T3
To E3
Connections to
Main PCB
#4 #12
To E1
To E2
Input Side
L1
L3
L2
Art # A-03212
L1 L2 L3 L4
T1
T2
T3
T4
#13
#12
#78
L1
L2
Input
Side
#5
#4
#3
#2
#1
Main Contactor
Main Input Contactor (460-Volt Three-Phase Input Power Shown) 208/230-Volt Main Input Contactor
2. Check for 28 VAC at J23-1 to J23-3 on the Main PC Board.
a. If greater than 30 VAC, input line power is too high.
b. If there is no AC power, check the fuse. If the fuse is okay, the auxiliary transformer is faulty. Replace the Main PC
Board.