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Field Loss Light Illuminated

In order to help us provide you with quality support please have the following informationavailable when you call AB Drives Technical Support.

Drives Catalog/Bulletin number (Normally found on the inside of the front cover door)

Fuses 4F and 5F checked for blown condition

Measured field voltage and field current

Motor nameplate information: Field Voltage, Field Current, and Field resistance if given.

Measured Field resistance of the motor. NOTE: A motor problem is indicated if the measuredfield resistance is very high or very low.Field Resistance = Field Voltage/ (Field Current X 1.39)

Motor field connections (F1, F2, F3 , and F4) series or parallel.

Additional Hints:Terminal 1 on the Main Control Board is the field loss input. The minimum dc voltage at terminalwith respect to terminal 24, common, is 0.9 volts dc. If this voltage is not present then eitherthere is no field current flow or Field Loss board is not operating. If the voltage is present butthe field loss is still indicated then the Main Control Board should be replaced.

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Thyristor Over temperature Light Illuminated

In order to help us provide you with quality support please have the following informationavailable when you call AB Drives Technical Support.

Drives Catalog/Bulletin number (Normally found on the inside of the front cover door)

Additional Hints:

Two thermistors, 1Therm and 2Therm, are mounted on the armature scr heatsink assemblies.

The leads from the thermistors are connected to the main control board on terminals 33 and 34for 1Therm and terminals 35 and 36 for 2Therm. The normal resistance of the thermistors is50 K ohms at 25o C and decreases to 2603 ohms at 100o C.If the Thyristor Over temperature fault occurs intermittently a simple test would be to replace thetwo thermistors with 47K ohm, 2 watt resistors across terminals 33-34 and terminals 35-36. Ifthe fault clears and does not reoccur then the thermistors should be replaced. If the problempersists then the Main control board should be replaced.

Part Description Old Board Part Number New Board Part Number Kit NumberMain Control 12M08-0007 102902 111741

Potentiometer board 12M08-0008 102903 none

Potentiometer board 104201 116184

Relay board 12M08-0005 102899 116185

Field Loss Assembly 12M08-00012 102906 116183

Tach Feedback Board 12M08-00017 102910 102910

Field Bridge Rectifier 5P2-54 101020 Obsolete see below

101024 101024

Fan 103042 103042

Control Transformer Fuse 8P01-0050 101665 101665

600 volt, 1 amp, KTK-R

Field Fuse, 500V, 8P01-146 101751 101751

10 amp, KLM-10

Fault Relay 6P1-00016 101184 101184

Fault Relay Retaining 6P99-0004 101472 101472

Clip

Plug in Relays 6P1-00090 101215 101215

Retaining Clip 6P99-00015 101474 101474

Capacitor, 4MFD 100778 100778

Control Transformer 100840 100840

Surge Suppressors 101063 101063

105 Amp Module 250 Amp Module 345 Amp Module

Line Fuses 101749 101750 101756

Armature SCR 101110 163181 163182

1379 Spare Parts.pdfPart DescriptionOld Board Part NumberNew Board Part NumberKit NumberField Fuse, 500V,8P01-146101751101751