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1. Lack of, or defective operation of, a check

valve in a pumping system.

2. Lack of, or defective operation of, a back draft

damper on a fan system.

3. Defective damper control in a variable air vol-

ume (VAV) system.

See Section 7.2.2 for information on resetting this fault.

4.134.13

4.13

GFGF

GF displays if the motor or its wiring GROUND

FAULTS by short circuiting or arcing to ground. See

Section 7.2.1 for information on resetting this fault.

4.144.14

4.14

EXTEXT

EXT displays if the motor overload is tripped or

if drive sees an open circuit in the EXTERNAL fault

circuitry supplied by the customer wiring terminated

on 4TB4 terminals 5 and 6. This circuitry includes the

customer’s emergency shutdown interlocks such as

the fire alarm contact, freeze stats, high pressure cut-

out contacts, etc.

DANGER

THE DRIVE WILL RESTART AUTO-THE DRIVE WILL RESTART AUTO-

THE DRIVE WILL RESTART AUTO-

MATICALLY WHEN AN EXTERNALMATICALLY WHEN AN EXTERNAL

MATICALLY WHEN AN EXTERNAL

FAULT IS CLEARED UNLESS AFAULT IS CLEARED UNLESS A

FAULT IS CLEARED UNLESS A

STOP COMMAND IS GIVEN PRIORSTOP COMMAND IS GIVEN PRIOR

STOP COMMAND IS GIVEN PRIOR

TO RESETTING THE FAULT.TO RESETTING THE FAULT.

TO RESETTING THE FAULT.

4.154.15

4.15

LAMP TEST/HIGH VOLTAGELAMP TEST/HIGH VOLTAGE

LAMP TEST/HIGH VOLTAGE

Immediately upon applying power, all fault indicators

and the READY, RUN, TEMP and @ LCDs will dis-

play briefly as a lamp test.

If the input line voltage from the utility is excessively

high, the individual fault, READY, RUN, TEMP and

@ LCDs will display and remain on.

4.164.16

4.16

METER DISPLAY INDICATORSMETER DISPLAY INDICATORS

METER DISPLAY INDICATORS

When the meter select switch is pressed and released,

it will step to the next meter display. The appropriate

meter display indicator will display to indicate which

function is currently shown on the LCD display. The

meter function indicators are: % SPEED, AMPS, %

LOAD, VOLTS, Hz, RPM, kW and AUX. If the meter

function is not installed, that function will display

briefly and then cycle to the display.

4.174.17

4.17

MIN <—> MAXMIN <—> MAX

MIN <—> MAX

The MIN <—> MAX speed indicator is a bar scale that

displays additional LCD segments as the local speed

command to the drive is increased and extinguishes

segments as the speed command is decreased.

NOTE:NOTE:

NOTE:

THE DRIVE SPEED IS THE DRIVE SPEED IS

THE DRIVE SPEED IS

SHOWN ON THE LCD DISPLAY ASSHOWN ON THE LCD DISPLAY AS

SHOWN ON THE LCD DISPLAY AS

% SPEED.% SPEED.

% SPEED.

connection.

3. The motor wiring for proper voltage connec-

tion.

4. That there are no power factor correction ca-

pacitors installed between the drive output

and the motor.

5. That the motor disconnect, motor starter or

contactor, or other devices which can open and

close connections between the output of the

drive and motor are not being operated while

the drive is running.

6. Check SCRs SCR1, SCR2, SCR3, SCR4, SCR5

and SCR6 for a short or open circuit or bad

gate sections.

7. Check the conduction or commutation transis-

tors in the Q1/Q2 module for a short or open

circuit.

8. Check the commutation power supply fuse F3

on the snubber board.

See section 7.2.4 for information on resetting this fault.

4.114.11

4.11

UVUV

UV displays when the UNDERVOLTAGE circuit

is activated due to a loss of power (blackout), low volt-

age (brownout) or loss of phase L2 or L3 power. The

LCD will display when power is restored.

If the UNDERVOLTAGE circuit activates check:

1. The incoming line voltage is less than 90% of

nominal.

2. Momentary interruptions or severe drops in

power line voltage due to the operation of

other equipment, overloading the transformer

on the incoming power to the drive, or utility

company power drops.

See Section 7.2.3 for information on resetting this fault.

4.124.12

4.12

OVOV

OV is displayed when the inverter output

OVERVOLTAGE circuit is activated by a regenerat-

ing motor. The rotation of a motor in excess of the

drive’s commanded speed, or in the reverse direction

of the drive’s commanded rotation causes the motor to

act as a generating power source. This “backfeeding”

of power causes the OVERVOLTAGE fault circuit to

trip if the drive output voltage levels become exces-

sive.

NOTE:NOTE:

NOTE:

THIS OV CIRCUIT DOES THIS OV CIRCUIT DOES

THIS OV CIRCUIT DOES

NOT MONITOR OR PROTECTNOT MONITOR OR PROTECT

NOT MONITOR OR PROTECT

AGAINST HIGH POWER LINEAGAINST HIGH POWER LINE

AGAINST HIGH POWER LINE

VOLTAGES.VOLTAGES.

VOLTAGES.

OV trips are typically caused by the application. The

system either causes the motor to rotate without the

drive as the prime mover, or rotate faster than the

prime mover is commanding it to operate (overhaul-

ing). Examples of typical application related problems

are:

Brand	Graham
Model	1703 Series
Category	DC Drives
Language	English

Graham 1703 Series User Manual

Table of Contents

Questions and Answers:

Graham 1703 Series Specifications