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ABB KLF-1 Manual

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  • Page 2 41-748.31B KLF-1 Loss-of-Field Relay 2 1 ) . T h e p r i m a r y o r c u r r e n t w i n d i n g o f t h e Mechanically, the cylinder unit is composed of four...

  • Page 3: Operation

    41-748.31B KLF-1 Loss-of-Field Relay a spiral spring. The spring adjuster is also held in assembly, and a molded bridge. place by a spring type clamp. The electromagnet has two pairs of voltage coils. When the contacts close, the electrical connection is Each pair of diametrically opposed coils is connected in series.
  • Page 4 The type KLF-1 relay is available in one range. Long current and is equal to T. Each secondary com- Reach is 2.08 to 56 ohms. Short Reach is 0.79 to pensator voltage is in series with voltage V 18.0 ohms.

  • Page 5: Setting Calculations

    The main contacts will safely close 30 amperes at 250 volts dc and the seal-in contacts of the indicating The KLF-1 relay may be applied as a single-zone contactor switch will safely carry this current long device, or two relays may be used to provide enough to trip a circuit breaker.
  • Page 6 41-748.31B KLF-1 Loss-of-Field Relay The single-zone and two-zone setting recommenda- Continue this process with other points from curves tions are modified when two or more machines are such as those of Figure 7 (page 23) until a complete bussed at the machine terminals. The voltage and curve like that of Figure 8 (page 23) is obtained.

  • Page 7: Sample Calculations

    ---------- - ± 0.15 1.15 Assume that a KLF-1 relay is to be applied to the fol- lowing machine: This is 99.7% of the desired setting. 3-phase, 60 cycles, 3600 rpm, 18 kV, rated at 0.9 pf, To set Z = 3.29 ohms:...
  • Page 8 58 V . (Equivalent to 100 able to use an external timer in conjunction with the KLF-1 Relay. The following examples are applica- L-L. tions where an external timer would be desirable: 3. For all applications where the alarm function 1.

  • Page 9: Setting The Relay

    7.0 SETTING THE RELAY larger impedance characteristic and will detect partial loss-of-field conditions. A typi- The type KLF-1 relay requires a setting for each of cal setting would be to just allow the machine the two compensators T and T...

  • Page 10: Installation

    41-748.31B KLF-1 Loss-of-Field Relay COMPENSATOR (T AND T Values for which an M setting can be made are from -.15 to +.15 in steps of .03. The value of a setting is Each set of compensator taps terminates in inserts...

  • Page 11: Acceptance Check

    41-748.31B KLF-1 Loss-of-Field Relay screws may be utilized for grounding the relay. The current until contacts just close. This current should be within ± 3% of 17.9 amps, (17.3 - electrical connections may be made directly to the terminals by means of screws for steel panel mount- 18.5 amps).

  • Page 12: Repair Calibration

    41-748.31B KLF-1 Loss-of-Field Relay Repeat above except pass 85% of ICS name- For the most accurate calibration preheat relay plate rating current. Contacts should not pickup for at least an hour by energizing terminals 4, 5, and target should not drop.
  • Page 13 41-748.31B KLF-1 Loss-of-Field Relay such that the contacts will just close. De-ener- With 50 volts and 5 amperes applied, vary gize the relay. The moving contact should return the phase shifter to obtain the two angles to open position against the right-hand stop.
  • Page 14 41-748.31B KLF-1 Loss-of-Field Relay 1) Contact Gap Adjustments 1/16” ahead. The cover may be removed and the tab holding the target reformed slightly if a. L.H. (Normally Closed) Contact Adjustment necessary. However, care should be exer- With the moving contact arm in the closed...
  • Page 15 FOR RELAYS RATED 1. Connect the relay as shown in Figure 9 (Dia- AT 120 VAC gram of Test Connections for KLF-1 Relay The proper adjustments to insure correct operation of on page 24), with the switch in position 1 and this relay have been made at the factory.
  • Page 16 41-748.31B KLF-1 Loss-of-Field Relay 2. Decrease the voltage until the contacts close between R and tap being measured. Exam- to the left. This value should be 90 ± 3% volts. ple 100 (1 + .03 + .06) = 109 volts.
  • Page 17 3/4 of one turn Using the connections of Figure 9 (Diagram of for a contact gap of .22”. Test Connections for KLF-1 Relay on page 24), apply 10 volts ac 90° leading, to terminals 4 and 2. With relay de-energized adjust the restraint 5 pass 0.63 amperes through current circuit ter-...
  • Page 18 41-748.31B KLF-1 Loss-of-Field Relay the directional unit need not be cooled F. Indicating Contactor Switch (ICS) during initial rough adjustment. But, the Initially adjust unit on the pedestal so that arma- directional unit should be cool when final ture fingers do not touch the yoke in the reset adjustment is made.

  • Page 19: Renewal Parts

    41-748.31B KLF-1 Loss-of-Field Relay should jump from 0 to the rated voltage after between lead L and terminal 5. a time delay of 0.4 ± 10% seconds. A trimpot a. For T = 15.8 the voltage measured on the PC board can be adjusted to obtain should be 158 volts ±...
  • Page 20 41-748.31B KLF-1 Loss-of-Field Relay...
  • Page 21 41-748.31B KLF-1 Loss-of-Field Relay Sub 1 185A181 Figure 2. Compensator Construction Sub 5 3531A60 Figure 3. Internal Schematic of Type KLF-1 Relay in FT41 Case...
  • Page 22 41-748.31B KLF-1 Loss-of-Field Relay...
  • Page 23 0.64 SCR, inner-cooled, 3600 rpm) Sub 2 *Sub 2 188A320 185A184 Figure 6. Effect of Compensator Voltage (Z is positive) Figure 8. Typical Machine Capability Curves and Sample KLF-1 Settings - Per Unit Impedance * Denotes change since previous issue...
  • Page 24 41-748.31B KLF-1 Loss-of-Field Relay...
  • Page 25 41-748.31B KLF-1 Loss-of-Field Relay *Sub 3 3533A32 Figure 10. Generalized External Schematic *Sub 3 3533A32 Figure 11. Zone-1 Impedance Characteristic...
  • Page 26 41-748.31B KLF-1 Loss-of-Field Relay *Sub 3 3335A32 Figure 12. Zone 2 Impedance Characteristic Sub 2 3491A09 Figure 13. KLF-1 Frequency Response For Impedance Unit For 60 Hz Relay...
  • Page 27 41-748.31B KLF-1 Loss-of-Field Relay *Sub 4 3533A29 Figure 14. Relay Type KLF-1, Time Delay Schematic for Class 1E Application...

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