Daikin MPS015 F Installation And Maintenance Manual

Contents

Thermal Overload RelayDesigned to provide current-dependent protection for loadswith normal starting against impermissibility high temperaturerises due to overload, phase asymmetry or phase failure.Increase in motor current beyond set point as a result tooverload or phase failure will trip the overload and disconnectthe motor.The Relay trip points are factory set. Do not change unlessthe motor ampacity changes or the Relay is replaced witha new device with incorrect set point adjustment. Any othernon-authorized trip points or set points adjustment voids all orportions of the unit’s warranty. Authorized set point adjustmentis accomplishment as follows:1 For motors with 1.15 service factor, rotate the arrow on thedial to correspond to the motor FLA (See Figure 85).2 For motors with a 1.0 service factor, multiply the motorFLA with 0.9; then rotate the arrow on the dial tocorrespond to that value.To reset a tripped Relay, push the blue RESET button. Todisconnect, push the Red stop Button.Other Relay features:• Three connection systems options, Screw type, springloaded and ring cable lug connection.• Switch position indicator to indicate a trip and TESTfunction for wiring.• Large rotary button to adjust current to Motor RLA.• Selector switch for manual/and automatic RESET.Figure 85: Overload RelayCircuit BreakerCircuit breakers are installed upstream of all VFDs to provideshort circuit protection. These breakers are not adjustable.To reset a tripped circuit breaker: Clear the trip by rotating thelever down to the OFF position. Then rotate lever up to the ONposition (see Figure 86).Breakers, like MMPs, have three distinct modes of operationwhich are clearly indicated by the handle position. Thepositions are ON (usually up, OFF (usually down), andTRIPPED (midway). Some circuit breakers may have a push-to-test buttonCAUTIONIf a circuit breaker has tripped due to an overload or a faultcurrent (short circuit), prior to resetting, the connected wiringcircuits must be checked to determine the cause of theinterruptionReset After Tripping InformationIf a breaker is tripped, the handle/lever will be halfway betweenthe OFF and ON positions. To reset a tripped circuit breaker:1 Press the handle or rotate the lever to the OFF position.2 Press the handle or rotate the lever the oppositedirection to the ON position.WARNINGIn certain applications the circuit breaker may be mountedupside down. Therefore, when the handle is in the DOWNposition it may not be turned OFF. The handle positioncorresponds to ON and OFF text clearly printed on the faceof the unit. Be sure the mounting orientation and desiredhandle position is verified prior to performing service on theequipment. Only qualified service personnel should work onthis equipment. Improper position of the breaker handleduring service may result in electric shock or deathFigure 86: Circuit BreakermaInTenanCewww.DaikinApplied.com 103 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS