GEI-68720 MULTI - CONTACT AUXILIARY RELAY TYPE HFA54 DESCRIPTION The HFA54 relays are instantaneous, hinged - armature, multi - contact, electric reset, auxiliary relays. Some of the models are also available with a hand reset feature in addition to the electric reset feature.
(6) circuit - closing contacts (code 60) . However, the HFA54 D and HFA54 K relays are available with contact code 33 only, as given in Table V. The general characteristic of HFA54 relays are summarized in Table II.
GEI-68720 TABLE III (HFA54B, C, E) E NO. CONTACT ARRANGEMENl POS ITION NO. a =Normally Open b = Normally Closed + = Used to Open Reset Coil Circuit a 1 = Normally Open, Long Wipe b 1 = Normally Closed, Long Wipe TABLE IV (HFA54H, J, L ) CODE NO.
GEI-68720 The HFA54 N is similar to the HFA54M except that it has an additional feature of hand reset. The internal connections diagram of the HFA52�t and HFA54 N shows an external capacitor connected in parallel with the operating coil and an external resistor connected in series with the operating coil and external capacitor.
GEI-68720 SERVICING AND ADJUSTMENTS CONTACT CLEANING In cleaning fine silver contacts a flexible burnishing tool should be used. This consists of a flexible strip of metal with an etched, roughened surface, resembling, in effect, a superfine file. The polishing action is so delicate than no scratches are left, yet corroded material will be removed rapidly and thoroughly.
GEI-68720 To check performance, turn the stop screw in until one contact continuity lamp is lit. Turn stop screw in an additional 1/2 turn and all continuity lamps should be lit. Back off the stop screw to obtain at least 1/4 inch contact gap. Insert a 7/32-inch gage between any of the normally-open moving and stationary contacts and turn the stop screw clockwise until the continuity lamp lights.
EACH <DNTACT CONVERT! B LE ONLY - ACCORD! NG TO CONTACT AHRANGEMENT CODE. FIG. 4 ( 0104 A8528-5) INTERNAL CONNECTIONS OF HFA54 B, HFA54 C, HFA54 0, and HF54 E RELAYS (BACK VIEW) RESET C OIL INTERNAL CONNECTIONS BACK VIEW FIG.