Excessively When Loads Are Applied; Problem 4 - Unstable Voltage Or Incorrect Output Which Is Not Triggering A Shutdown; Problem 3 - Voltage And Frequency Drop - Generac Power Systems 7 kW NG Repair Manual

Section 2.3
Troubleshooting Flow Charts
Problem 3 – Voltage and Frequency Drop Excessively When Loads Are Applied
TEST 14 - CHECK
BOTH
VOLTAGE AND
LOW
FREQUENCY
UNDER LOAD
GOOD
DISCONTINUE
TESTING
LOOK FOR A SHORTED CONDITION
IN A CONNECTED LOAD OR IN ONE
OF THE LOAD CIRCUITS
Problem 4 – Unstable Voltage or Incorrect Output Which is Not Triggering a Shutdown
TEST 1 – CHECK
AC OUTPUT
VOLTAGE
HIGH
OR
LOW
TEST 3 -
CALIBRATE
VOLTAGE
Page 46
TEST 15 - CHECK
FOR OVERLOAD
CONDITION
OVERLOADED
REDUCE LOADS TO UNIT'S
RATED CAPACITY
TEST 7 - CHECK
GOOD
STATOR AC
POWER WINDINGS
REPAIR OR REPLACE
ERRATIC PROCEED TO PROBLEM 1
PART 2
NOT
OVERLOADED
TEST 12 - CHECK
STEPPER MOTOR
CONTROL
BAD
REPAIR OR REPLACE
ENGINE
CONDITION
GOOD
BAD
AC GENERATORS
IF RECONFIGURED TO LP GAS,
VERIFY THAT PROPER
PROCEDURE WAS FOLLOWED
(REFER TO SECTION 1.3)
GOOD
TEST 16 - CHECK
ENGINE CONDITION
GOOD
GO TO "PROBLEM 18 -
ENGINE STARTS HARD
AND RUNS
ROUGH/LACKS POWER"
SECTION 4.3