ABB CRN-1 Instruction Leaflet Download | Manualshive

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41-251.21C

9

Type CRN-1
Reverse Power Relay

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Summary of Contents for CRN-1

Page 1: ...adioactive material to the environ ment The type CRN 1 relay is a single phase directionally controlled timing relay used to protect ac generators from motoring When such a condition occurs and persists for a predetermined time interval the gener ator may be tripped or an alarm sounded The CRN 1 may also be used to sense lagging power factor load flow in an abnormal direction The direc tional unit...

Page 2: ... which is threaded into the bridge The electromagnet is secured to the frame by four mounting screws The moving element assembly consists of a spiral spring contact carrying member and an aluminum cylinder assembled to a molded hub which holds the shaft The shaft has removable top and bottom jewel bearings The shaft rides between the bottom pin bearing and the upper pin bearing with the cylinder r...

Page 3: ...n a location free from dirt moisture excessive vibration and heat Mount the relay vertically by means of the four mounting holes on the flange for the semi flush type FT case Either the stud or the mounting screws may be utilized for grounding the relay External toothed washers are provided for use in the locations shown on the outline and drilling plan to facilitate making a good electrical conne...

Page 4: ...ltage curves c Minimum Operate Voltage Set the time dial to position 6 Alternately apply 54 of rated voltage plus 3 and minus 3 The moving contact should leave the backstop at plus 3 and should return to the backstop at minus 3 d Time Curve Figure 2 page 8 shows the time curve for the CRN 1 relay With the time dial set to the indi cated position apply the voltages specified and measure the operati...

Page 5: ...mes as shown on the respec tive time voltage curves 6 4 MINIMUM OPERATE VOLTAGE The adjustment of the spring tension is required in setting the minimum operate voltage of the relay A spring shield covers the reset spring of the CV unit To remove the spring shield requires that the damp ing magnet be removed first The screw connection holding the lead to the moving contact should be removed next Th...

Page 6: ... right stop on bridge screw in the stationary contact until both contacts just close as indicated by a neon lamp in the contact circuit Then screw the stationary contact away from the moving contacts 3 4 of a turn The clamp holding the stationary contact housing need not be loosened for the adjustment since the clamp utilizes a spring type action in holding the sta tionary contact in position The ...

Page 7: ... units of the type CRN 1 relay are as follows 7 0 RENEWAL PARTS Repair work can be done satisfactorily at the factory However interchangeable parts can be furnished to the customers who are equipped for doing repair work When ordering parts always give the complete nameplate data Coil Burden at Volt Amperes Power Factor Angle that current lags the voltage Timer Directional Potential Directional Cu...

Page 8: ...41 251 21C 8 Type CRN 1 Reverse Power Relay 184A547 Sub 2 Figure 2 Typical Time curves of the timer unit of the 120 volt type CRN 1 relay Proportional voltages apply for the 208 and 240 volt relay ...

Page 9: ...41 251 21C 9 Type CRN 1 Reverse Power Relay Figure 3 External Schematic of the type CRN 1 for reverse power protection Sub 5 184A466 ...

Page 10: ...41 251 21C 10 Type CRN 1 Reverse Power Relay Figure 4 Test connections for the timer unit of the type CRN 1 Class 1E relay in the type FT 21 case Sub 1 9663A61 ...

Page 11: ...41 251 21C 11 Type CRN 1 Reverse Power Relay Figure 5 Outline Drilling for relay case type FT 21 for Class 1E application Sub 4 3519A66 ...

Page 12: ...ed in U S A ABB Automation Inc 4300 Coral Ridge Drive Coral Springs Florida 33065 800 523 2620 FAX 954 345 5329 41 251 21C Type CRN 1 Reverse Power Relay Visit our Website www abbus com papd ABB ABB ABB ABB ...

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