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brighter as the drive speed is increased. The COM-

MUTATION DRIVE LED indicates the frequency at

which the Q2 commutation transistor is pulsed to fa-

cilitate the inverter SCR commutation (turn off).

WARNING

IF THE COMM DRIVE LED ISIF THE COMM DRIVE LED IS

IF THE COMM DRIVE LED IS

BRIGHTLY ILLUMINATED WHENBRIGHTLY ILLUMINATED WHEN

BRIGHTLY ILLUMINATED WHEN

NO RUN COMMAND IS PRESENT,NO RUN COMMAND IS PRESENT,

NO RUN COMMAND IS PRESENT,

THE CIRCUIT IS NOT FUNCTION-THE CIRCUIT IS NOT FUNCTION-

THE CIRCUIT IS NOT FUNCTION-

ING PROPERLY AND NO ATTEMPTING PROPERLY AND NO ATTEMPT

ING PROPERLY AND NO ATTEMPT

SHOULD BE MADE TO RUN THESHOULD BE MADE TO RUN THE

SHOULD BE MADE TO RUN THE

DRIVE.DRIVE.

DRIVE.

5.45.4

5.4

COND DRIVECOND DRIVE

COND DRIVE is a green LED which is nor-

mally on. The LED is extinguished in the event of a

fault condition. The drive will not operate if the

COND DRIVE LED is not illuminated.

5.55.5

5.5

RUN CMDRUN CMD

RUN CMD is a green LED that illuminates

when a RUN COMMAND is given to the drive from

4TB4 terminals 3 and 4. It should be illuminated

when the customer contacts 3 and 4 are closed and ex-

tinguished when they are open.

SECTION 5.SECTION 5.

SECTION 5.

INTERNAL DRIVE STINTERNAL DRIVE ST

INTERNAL DRIVE ST

TUSTUS

TUS

INDICAINDICA

INDICA

ORSORS

ORS

Many of the drive status indicators are displayed both internally and externally. The following circuits are dis-

played in this dual indicator form.

CircuitCircuit

Circuit

Internal LEDInternal LED

Internal LED

Normal Status of Internal LEDNormal Status of Internal LED

Normal Status of Internal LED

READY YELLOW On in READY mode - see 4.2

AT SPEED YELLOW On when AT SPEED - see 4.4

RUN GREEN On in RUN - see 4.3

TEMP GREEN On normally - see 4.9

FAULT RED On in FAULT - see 4.6

OLI RED On in OVERLOAD - see 4.7

OCI RED On in OVERCURRENT - see 4.10

OVI RED On in OVERVOLTAGE - see 4.12

UVI RED On in UNDERVOLTAGE see 4.11

PLI RED On in PHASE LOSS - see 4.8

GFI RED On in GROUND FAULT see 4.13

Additional status indicators are provided internally only to indicate BUS PWR, COMM P.S., COMM DRIVE,

COND DRIVE and RUN CMD.

5.15.1

5.1

BUS PWRBUS PWR

BUS PWR is a red LED that is illuminated when

BUS POWER is available on the DC bus. After power

is removed from the drive input, this LED will remain

lit and dim slowly as the bus capacitors discharge.

DANGER

DO NOT ATTEMPT TO SERVICEDO NOT ATTEMPT TO SERVICE

DO NOT ATTEMPT TO SERVICE

THE DRIVE WHEN THE BUSTHE DRIVE WHEN THE BUS

THE DRIVE WHEN THE BUS

POWER LED IS ILLUMINATEDPOWER LED IS ILLUMINATED

POWER LED IS ILLUMINATED

5.25.2

5.2

COMM P.S.COMM P.S.

COMM P.S. is a green LED that is illuminated

when the COMMUTATION POWER SUPPLY is en-

ergized. This LED should be on any time that input

power is supplied to the drive.

DANGER

DO NOT ATTEMPT TO START THEDO NOT ATTEMPT TO START THE

DO NOT ATTEMPT TO START THE

DRIVE IF THE COMM P.S. LED ISDRIVE IF THE COMM P.S. LED IS

DRIVE IF THE COMM P.S. LED IS

NOT ILLUMINATED. DRIVE DAM-NOT ILLUMINATED. DRIVE DAM-

NOT ILLUMINATED. DRIVE DAM-

AGE CAN OCCUR IF ATTEMPTSAGE CAN OCCUR IF ATTEMPTS

AGE CAN OCCUR IF ATTEMPTS

ARE MADE TO OPERATE THEARE MADE TO OPERATE THE

ARE MADE TO OPERATE THE

DRIVE WITHOUT A COMMUTA-DRIVE WITHOUT A COMMUTA-

DRIVE WITHOUT A COMMUTA-

TION POWER SUPPLY.TION POWER SUPPLY.

TION POWER SUPPLY.

5.35.3

5.3

COMM DRIVECOMM DRIVE

COMM DRIVE is a red LED that pulses on and

off slowly at slow speeds. It pulses faster and appears

Brand	Graham
Model	1703 Series
Category	DC Drives
Language	English

Graham 1703 Series User Manual

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Questions and Answers:

Graham 1703 Series Specifications