Carrier 50PG03-07 Specifiche Scaricare il pdf (Pagina 47)

4. RemovefilejumperacrossTandTl.Theactuatorshould

drivefullyclosed.

5. ReturnEconoMi$erIV settingsandwMngto normal

aftercompletingtroubleshooting.

ECONOMISER[V TROUBLESHOOTINGCOMPLE-

TION-- ThisprocedureisusedtoreturntheEconoMi$erIV

tooperation.Notroubleshootingortestingisdonebyperform-

ingthefollowingprocedure.

1. DisconnectpoweratTRandTRI.

2. Setenthalpypotentiometertoprevioussetting.

3. SetDCVmaximumpositionpotentiometertoprevious

setting.

4. Setminimumposition,DCVsetpoint,andexhaust

potentiometerstoprevioussettings.

5. Remove620-ohmresistorfromterminalsSRand+.

6. Remove1.2kilo-ohmcheckoutresistorfromterminals

Soand+.Ifused,leconnectsensorfromtermin_dsSoand

7. Remove jumper from TR to N.

8. Remove jumper from TR to 1.

9. Remove 5.6 kilo-ohm resistor from T and TI. Reconnect

wiles at T and TI.

10. Remove jumper from P to PI. Reconnect device at P and

PI.

11. Apply power (24 vac) to termin_ds TR and TRI.

Phase Loss Protection -- The phase loss protection

option will monitor the three-phase electric;d system to provide

phase reversal and phase loss protection.

PHASE REVERSAL PROTECTION -- If the control sens-

es an incorrect phase rekitionship, the rekiy (KI) will be de-

energized (opening its contact). If the phase relationship is

correct, the relay will be energized. The control has a self-

bypass function after a pre-set time. If the control determines

that the three phases stay in a correct relationship for 10 con-

secutive minutes, the rekiy will stay energized regardless of the

phase sequence of three inputs as long as 24-vac control

voltage is applied. This self-bypass lhnction will be reset if _dl

three phases are restored in a phase loss event.

PHASE LOSS PROTECTION-- If the reverse rotation

board senses any one of the three phase inputs has no AC volt-

age, the relay will be deenergized (opening its contact). This

protection is always active as long as 24-vac control voltage is

applied, and is not affected by the self bypass function of the

phase sequence monitoring function. Howevel: in the event of

phase loss, the relay will be re-energized only if all three phases

me restored and the three phases me in the correct sequence.

A red LED is provided to indicate the function of the board.

See the table below.

LED STATUS FUNCTION

Relay contact open (phase loss or phase

On Continuously Relay contact closed (normal operation).

Blinking reversal has occurred) -- No power will be

supplied to the control system.

Off 24 vac control power not present (off).

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