Carrier 23XL Dokumentacja Pobierz pdf (Strona 84)

ELECTRONIC PROTECTION RELAY (EPR) — On Cutler-

Hammer solid state starters, the EPR is designed to provide

an alternative to conventional motor protection due to over-

current. See Fig. 53. It performs the following functions:

Test Button — The TEST button provides testing of the EPR’s

ability to detect overload, test relay operation, and simulate

motor load.

System Ready (SYST RDY) — This light-emitting diode (LED)

provides a visual indication that the EPR is

functioning.

Trip Time Potentiometer — The Trip Time potentiometer has

50 selectable overload trip classes ranging from 1 to

50 seconds.

Reset Time Potentiometer — The Reset Time potentiometer

has 5 to 120 minutes of motor cooling reset.

Full Load Amperes (FLA) — The FLA potentiometer is ad-

justable from 1 to 1,500 amps, based on overload frame size.

Trip LED — The Trip LED provides a visual indication that

the EPR has detected an overload condition and tripped.

Fault (FLT) LED — The FLT LED is an indicator light.

Reset Button — The RESET button allows for the manual

reset of the EPR.

Trip, Common (COM), and FLATest Terminals — The Trip,

COM, and FLA test terminals provide for Digital Voltmeter

(DVM) calibration.

Terminal 1 (TB1) — Terminal 1 is the 120 vac connection

to power the EPR.

Terminal 4 (TB4) — Terminal 4 is the normally closed, elec-

tronically isolated EPR contact for overload trip.

NOTE: When the System Ready (SYST RDY) LED is a steady

green light, no fault has been found in the solid-state starter

operation. When the SYST RDY LED is a steady green light

and the fault indicator (FLT) is a ﬂashing red light, the a

motor overload trip is approaching. When the FLT LED is

a solid red light and the SYST RDY LED is a ﬂashing green

light, a motor overload trip has occurred. When the FLT LED

is a solid red light and the SYST RDY LED is a solid green

light, the overload has tripped because of a phase unbalance.

Fig. 50 — Resistance Check

SCR — Silicon Control Rectiﬁer

Fig. 51 — SCR and Power Poles

SCR — Silicon Control Rectiﬁer

Fig. 52 — Typical Cutler-HammerT Solid-State Starter

(Internal View)

FLT — Fault LED

Fig. 53 — Cutler-Hammer Terminal Functions

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 103 104

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