Generac Power Systems CorePower 6/7 kW 60 Hz Diagnostic Repair Manual page 51

TRANSFER SWITCH
SMM Problem 2 – Load Management Module (SMM) LED is ON, Load Not Powered
SMM Problem 2 – Load Management Module (SMM) LED is ON, Load Not Powered
SMM Problem 3 – Load Management Module (SMM) LED is Flashing, Load Not Powered
SMM Problem 3 – Load Management Module (SMM) LED is Flashing, Load Not Powered
SMM LED FLASHING –
LOAD NOT POWERED
LED FLASHING –
YES
1 SECOND INTERVAL
NO
LED FLASHING –
YES
3 SECOND INTERVAL
NO
LED FLASHING –
YES
6 SECOND INTERVAL
SMM Problem 4 – Load Management Module (SMM) is Humming or Buzzing
SMM Problem 4 – Load Management Module (SMM) is Humming or Buzzing
HUMMING SOUND
COMING FROM SMM
LOUD BUZZING
SOUND COMING
FROM SMM
PART 3
SMM LED ON –
LOAD NOT
POWERED
GENERATOR WAS
OVERLOADED, SHED
OCCURED AND POWER
APPLIED TO SMM.
GENERATOR
OVERLOADED WHILE
ATTEMPTING
RECOVERY FROM
SHEDDING.
LOCKOUT SWITCH
ENABLED AND THE
UNIT IS ON
GENERATOR POWER.
IMPROPER MOUNTING
OR INCORRECT
CONNETIONS.
LOAD NOT POWERED
TEST 37 – CHECK
VOLTAGE AT
CONTACTOR
CORRECTIVE ACTION:
WAIT 5 MINUTES PLUS
THE PRIORITY TIME
DELAY FOR SMM TO
ENABLE OUTPUT.
CORRECTIVE ACTION:
WAIT 30 MINUTES FOR
PMM TO ATTEMPT
LOAD REAPPLICAION.
CORRECTIVE ACTION:
REVIEW ATTACHED
LOAD, IF NECESSARY.
MOUNT SECURELY TO
WALL OR VERTICAL
SURFACE WITH ARROWS
POINTING UP ONLY.
TEST 37 – CHECK
VOLTAGE AT
CONTACTOR
Section 3.3
Troubleshooting Flowcharts
THIS WILL ALSO OCCUR IF
UTILITY POWER WAS JUST
APPLIED. (EXCEPT IF
TRANSFERING FROM GEN
TO UTILITY)
REVIEW ALL ENABLED
LOADS. DISABLE SUSPECT
LOADS TO PREVENT
OVERLOAD FROM
RECURRING.
DURING INSTALLATION, IT
WAS DETERMINED THAT
THIS LOAD WILL BE
DISABLED DURING
GENERATOR OPERATION
TO PREVENT GENERATOR.
NOTE: A NORMAL 60 HZ
HUM IS EXPECTED FROM
THE NORMAILLY OPEN
CONTACTOR.
NOTE: PMM MUST HAVE
240 VAC TO OPERATE
CORRECTLY.
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