POWR-GARD Relay Testing Equipment PGT-0400 Series Ground-Fault Relay Test Unit PGT Ground-Fault Relay Test Unit

Transcription

1 POWR-GARD Relay Testing Equipment Series Ground-Fault Relay Test Unit Ground-Fault Relay Test Unit AUGUST 7, 2009 REVISION 0 POWR-GARD GROUND-FAULT RELAY UNIT SERIES AMPERES THERMAL LIMIT USE SWITCHES LABELED AMPERES SET MAGNITUDE (0.5 A) OF OUTPUT CURRENT. USE SWITCHES LABELED SECONDS SET DURATION (0. s) OF OUTPUT CURRENT. PRESS INITIATE OUTPUT CURRENT. DISPLAY INDICATES MAGNITUDE OF OUTPUT CURRENT FOR DURATION OF OUTPUT. SET SWITCHES LABELED SECONDS 0.0 FOR MANUAL CONTROL OF OUTPUT DURATION. PUSH SWITCH OUTPUT ON OR OFF. AMPERES SECONDS Copyright 2009 by Littelfuse, Inc. All rights reserved. Publication: -M Document: P95-C Printed in Canada.

2 Page i TABLE OF CONTENTS Page Table of Contents... i List of Figures... i. GENERAL INDICATION.... THERMAL LIMIT INSTALLATION PROCEDURE TROUBLESHOOTING SPECIFICATIONS... 4 LIST OF FIGURES Page. Simplified Block Diagram Outline and Mounting Details Panel-Mounting Procedure Typical Connection Diagrams... DISCLAIMER Specifications are subject to change without notice. Littelfuse, Inc. is not liable for contingent or consequential damages, or for expenses sustained as a result of a malfunction, incorrect application, or incorrect adjustment. Pub. -M. August 7, Littelfuse POWR-GARD

3 Page. GENERAL The is an ac current source with a programmable output. The magnitude and duration of the output burst can be selected with front-panel thumbwheel switches so that ground-fault-relay coordination can be confirmed at the push of a button. The current output is transformer isolated from control power. A simplified block diagram of the is shown in Fig.. 2. INDICATION The two-digit LED display indicates the magnitude of the output current for the duration of the output burst. The center decimal point serves as a control power indicator. The decimal point on the right side of the display is used to indicate the thermal limit condition. 4. INSTALLATION outline and mounting details are shown in Fig. 2. Panel-mounting procedures are shown in Fig.. Connect 20-Vac supply voltage to and. Connect ground terminal to ground. Loop a test wire through the windows of the ground-fault CT's. Connect one end of the test wire to terminal OP and the other end to terminal OP2. For lead lengths under 40 ft, use 4 gauge wire. For lead lengths over 40 ft and less than 0 ft, use 2 gauge wire. If remote operation is required, connect a normally open contact across RMT and. Low-level contacts are recommended. Typical connection diagrams are shown in Fig. 4.. THERMAL LIMIT When the is used in the continuous output mode, the internal circuit temperature may reach the thermal limit temperature. To prevent damage to the the current output is disabled and the thermal limit indicator comes on. The output remains disabled until the temperature has fallen to a safe level at which time the thermal limit indicator turns off and the output is enabled. BUTN TIMER TIME ADJUST (0.0 SEC FOR CONTINUOUS) AC REFERENCE DERIVED FROM AC LINE INPUT AGC CURRENT LEVEL ADJUST + - OUTPUT DRIVE CIRCUITRY TRANSFORMER ISOLATION LOAD CONTROL FEEDBACK FIGURE. Simplified Block Diagram. Pub. -M. August 7, Littelfuse POWR-GARD

4 Page 2.4 (0.) 4.0 (4.09) 9.7 (.6) 9.7 (5.50).2 (0.2) POWR-GARD GROUND-FAULT RELAY UNIT SERIES F 22.7 (.7) 2.4 (.60) RMT OP OP2 AMPERES THERMAL LIMIT AMPERES SECONDS REAR VIEW PANEL THICKNESS.6 (0.06) 4. (0.9) SIDE VIEW FRONT VIEW 4. (0.56) 6.5 (2.50) M4 OR -2 TAP (NOTE 2) REAR PANEL OUTLINE SURFACE MOUNT 5.0 (0.20) 20.2 (.00) NOTES:. DIMENSIONS IN MILLIMETERS (INCHES). 2. MOUNTING SCREWS: M4 x OR -2 x BEZEL OUTLINE (0.) (0.) 2.5 (0.) 9.4 (.7) 9. (.67) 76.2 (.00) R=2.2 (0.09) R=4. (0.9) MAXIMUM 2.5 (0.).2.2 (0.2) (0.2) PANEL-MOUNT CUUT 95.0 (7.6) (0.25) (7.7) (0.25) 22.7 (.7) FIGURE 2. Outline and Mounting Details. Pub. -M. August 7, Littelfuse POWR-GARD

5 Page Step Step 2 Step RMT 2 OP OP RMT OP OP RMT 9 OP 2 OP2 The may be panel mounted without disassembly. NOTE: Remove plug-in terminal block before installing through panel. FIGURE. Panel-Mounting Procedure. PGC-5000 SERIES NEUTRAL FROM POWER SOURCE LOAD PGR-50 SENSING RESISR TERMINAL N L N NGR REMOTE INPUT 9 OP OP2 2 5 RMT I R REMOTE 9 L N R2 PGR-4704 /N OP OP2 2 L N 5 RMT 4 5 S S2 NOTE: FOR DEVICES WITH LOWER TRIP LEVELS SUCH AS THE PGR-4704 USE THE CIRCUIT AT RIGHT. RESISRS R AND R2 WILL LOWER CURRENT OUTPUT OF THE % OF SETTING. R =, W, % R2=0.,W,% I = / SETTING FIGURE 4. Typical Connection Diagrams. Pub. -M. August 7, Littelfuse POWR-GARD

6 Page 4 5. PROCEDURE Set the required output current level 0.5 to A. The recommended test current is 20% of the ground-fault trip level of device being tested. Set the output duration 0. to s or 0.0 for push on, push off operation. Press the button. If the ground-fault fails to trip, increase either the current level or time duration, and repeat the test until a trip occurs. 6. TROUBLESHOOTING Problem: No current output when the button is pressed. Possible Causes: Loose output connections. Resistance of the output wire is too high. VA requirement of the load is too high. Current is set to less than 0.4 A. No control power. Exceeded thermal limit. Troubleshooting: Check the operation by connecting a short length of wire across the output terminals and pressing the button. If using a remote test switch, check remote switch operation and connection to the. 7. TECHNICAL SPECIFICATIONS Input Voltage...20 Vac, 60 Hz, 0 VA Output Current Setting A Output Duration Setting s or continuous Output Voltage Vac maximum Shipping Weight kg (4. lb) Dimensions: Height mm (.7 ) Width mm (4. ) Depth mm (5.62 ) Environment: Operating Temperature..-40 to 60 C Storage Temperature to 0 C Pub. -M. August 7, Littelfuse POWR-GARD