GEK41931B INSTRUCTIONS MULTI-CONTACT AUXILIARY RELAYS TYPE HFA73K GE Protection and Control 205 Great Valley Parkway Malvern, PA 19355-1337
GEK-41931 CONTENTS PAGE DESCRIPTION 3 APPLICATION 3 TABLE I 3 CHARACTERISTICS 3 RATINGS 4 TABLE II 4 PICKUP 4 TABLE Ill 4 PICKUP TIME 5 TABLE IV S INSTALLATION 5 MOUNTING AND CONNECTIONS 5 MAINTENANCE 5 CONTACT ADJUSTMENT 5 CONTACT CLEANING 6 RENEWAL PARTS 6 Cover Photo (8042299) 2
GEK-4 1931 MULTI-CONTACT AUXILIARY RELAYS TYPE HFA73K DESCRiPTION The Type HFA73K is a high-speed, multi-contact, hinged armature auxiliary relay. It has a one half cycle pickup time. The relay is mounted in a double end, S 2 size case. Internal connections for Type HFA73K relays are shown in Figure 1; outline and panel drilling dimensions are shown in Figure 2. APPL ICAT ION The Type HFA73K is a high speed auxiliary tripping relay. When applying this relay, refer to Table I for the number of targets that may be dropped. TABLE 1 NUMB ER OF TARGETS DROPPED APPLIED TARGET NUMBER OF RELAY VOLTAGE RATING TARGETS DROPPED HFA73K1A 125 VDC 0.2 amp 3 0.6 amp 1 1.0 amp 1 HFA73K2A 250 VDC 0.2 amp 2 0.6 amp 1 HFA73K3A 48 VDC 0.2 amp 3 0.6 amp 3 CHARACTERISTICS The HFA73K relays are designed to obtain a pickup time of nine milliseconds or less. They are only available with the contact code shown in Table IV. The operating principle is as follows: Initially, the coil current is limited only by the resistance of the coil, because position 4 is a normally closed, long wipe contact. After the relay picks up, the These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with instillation, operation or mi,ntinance. Should further nfotmat1on be desired or should prtucular probleme arise which are not covered sufficiently for the purchaser s purposes the matter shu1d be referred to the Cenera I Slectric Corrçany Do the extent required the products cescribed herein meet applicable ANSI, IESE and NEMA standards; but no such assurance is g:ven with respect to Ial codes and ordinances because they vary greatly. 3
GEK-41931 contact in position 4 opens, and inserts the internal resistor in series with the coil, thereby reducing the coil current. This allows the coil circuit to be rated for continuous operation. RATINGS The HFA73K relays are available with coil ratings for 48, 125 and 250 volts DC. The current closing rating of each contact is 30 amperes. The contact current carrying rating is 12 amperes continuous. Table II lists the non inductive interrupting capacity of each contact. PICKUP TABLE II NON-INDUCTIVE INTERRUPTING CAPACITY OF EACH CONTACT VOLTS DC AMPERES 48 8 125 3 250 1 The relays are adjusted at the factory to pick up at 50 percent of rating or less. Normally, these adjustments should not change. If it does become necessary to readjust the relay, the knurled adjusting nut should be lifted 1/16 inch, turned clockwise to raise pickup, or counterclockwise to lower pickup, and then reseated in the hexagonal groove in the armature tail piece. The relay should be operated a few times to be certain that the mechanism operates freely, that the contact surfaces align properly, and that the contacts open quickly when the coil is de-energized. When 110 percent of rated voltage is applied, the arc on the normally closed, long wipe (bi) contact should extinguish as soon as the relay picks up. TABLE III BURDEN AND PICKUP AND DROPOUT VOLTAGE MODEL NO. VOLTAGE COIL RESISTANCE INTERNAL RESISTOR HFA13K1A 125 VDC 21 ohms 500 ohms HFA73K2A 250 VDC 82 ohms 2000 ohms HFA73K3A 48 VDC 2.9 ohms 75 ohms The temperature rise within the relay case due to the heat dissipated by the internal resistor and the coil is approximately 250C above the ambient temperature. 4
current interrupting rating of the relay may be affected. See PICKUP and PICKUP TME sections of this instruction book. milliseconds will also reduce the interrupting ratings of the contacts. If any contact adjustment is made, the pickup voltage, the pickup time and the gap, and thus increases or decreases operating time. It should be recognized that any bi = normally closed contact, long wipe panel drilling diagrams are shown in Figure 2. After the relay has been mounted, it inch of each other. Using the stop screw, adjust the standard wipe, normally open bl contact gap is 3/16 to 1/4 inch. change which significantly reduces the air gap to obtain times less than nine altered by adjustment of the armature stop screw, which increases or decreases the air is applied across the resistor and relay coil combination. This pickup time may be necessary for the a and the bi contacts to overlap. All standard wipe, normally closed (bi) contacts in position 4, so that when the armature is fully picked up. the contact gap to be 5/64 inch. Adjust the moving contact of the long wipe, normally fully picked up. All standard wipe, normally open (a) contacts should make within 1/64 open (a) contacts, and one long-wipe, normally closed (bl) contact. It is not open contacts should be set for a wipe of 1/32 inch to 3/64 inch when the armature is should be operated a few times to be certain that the mechanism operates freely. should need adjustment, proceed as follows: The relay has FIVE standard wipe, normally The Type HEA relays should be mounted on a vertical surface. The outline and PICKUP TIME GEK-41931 HFA73K relays should pick up in not more than nine milliseconds when rated voltage MOUNTING AND CONNECTIONS CONTACT ADJUSTMENT TABLE IV CONTACT ARRANGEMENT POSITION RELAY CODE 1 2 3 4 5 6 HFA73K 1 a a a bi a a a normally open contact MA INTENANCE The relays are shipped from the factory with all adjustments made. If the relays INSTALLATION CONTACT CODE 5
no scratches are left on the contacts, yet It cleans off any corrosion thoroughly resembles a superfine file. The polishing action of this tool is so delicate that a flexible strip of metal with an etched roughened surface, which in effect A flexible burnishing tool should be used for cleaning relay contacts. This Is CONTACT CLEANING 6 Since the last edition, Figure 2 has been changed. complete nameplate data. Electric Company. Specify the name of the part wanted, quantity required, and When ordering renewal parts, address the nearest Sales Office of the General replacement of any that are worn, broken or damaged. Sufficient quantities of renewal parts should be kept In stock for the prompt RENEWAL PARTS abrasive paper or cloth. of contact. Fine silver contacts should never be cleaned with knives, files, or and rapidly. The flexibility of the tool insures the cleaning of the actual points GEK 4 1931
GEK 41931 OPER. NT. P05. POS 2 POS. 3 POS. 4 POS. 5 POS. 6 a b n CODE ND.T I 2 a 3 NORMALLY OPEN CONTACT POS, 3 a I= NORMALLY OPEN CONTACT, LONG WIPE NO. 4 bi b= NORMALLY CLOSED CONTACT 5 a 1 bi= NORMALLY CLOSED CONTACTS LONG WIPE 6 Figure 1 (0246A6960-O) Internal Connections Diagram for HFA73K Relays (Front View) 7
.- 00000 1917 151311 IS // - / SEMI-FLUSH SURFACE FOR SURFACE MTG. PANEL LOCATION (2) 5/16-18 STUDS B (9/93) (100) GENERAL ELECTRIC PROTECTION AND CONTROL BUSINESS DEPT., MALVERN, PA 19355 Diagram for Type HFA73K Relays Figure 2 (K 6209272 L71) Outline and Panel Drilling MM INCHES VIEW SHOWING ASSEMBLY OF HARDWARE FOR SURFACE MTG. ON STEEL PANELS TYPICAL DIM. 76MM 3.0 5/16 18 STUD PANEL DRILLING FOR SEMI-FLUSH MOUNTING FRONT VIEW CA FOR SURFACE MOUNTING PANEL DRILLING FRONT VIEW 19MM 20 HOLES.218 5MM H5.687 144MM 3/4 DRILL (TYPICAL) 12MM.500 254MM CUflIUT 10 000 ----- 2 HOLES 5/8 DRILL 6MM 4 HOLES 157MM 76MMI DRILLED HOLES 1/4 DRILL 6. 187 19MM I CUTOUTS MAY R[PLACE 29MM 1 125 I -l [-.m BACK VIEW.. 10 8 6 4 2 00000 00000 97531 261MM HIG. SCREWS NUMBERING 10312 4) 10 32 X 3/8 STUD 20 18 16 14 12 00000 GEK 41931