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Summary of Contents for Electrical Test Instruments MAC-20
- Page 1 MEMORY AMMETER CONTROLLER MAC-20 INSTRUCTION MANUAL Firmware Version 1.85 and above Electrical Test Instruments, Inc. 1301 Avondale Road, Suite J New Windsor, MD 21776 www.ETIPrecision.com (410) 857-1880 Fax (410) 857-1387...
- Page 2 Electrical Test Instruments MAC-20 Section III – MAC-20 ============================================================================== MAC-20 Specifications INPUT POWER: 120 VAC, SINGLE PHASE 50/60 HZ, 20 VA Max CURRENT RANGES: 0-1,000 / 5,000 / 25,000 / 100,000 Amperes CURRENT ACCURACY: +/- 0.5% Reading + 0.5% Range + 1 Digit (Continuous) +/- 1.0% Reading + 1.0% Range + 1 Digit (Pulse >...
- Page 3 "fork", which fits closely around the current-carrying buswork. In the measurement system, in this case the MAC-20, the signal from the cur- rent sensor (typically about 240 mV for 1000 Amperes), is connected to an inte- grator, consisting of precision resistors and a capacitor.
- Page 4 A complete description of the software is beyond the scope of this manual; however, the following brief overview may enhance your understanding of the MAC-20. The SmartCore is based on a Zilog Z180 processor running at 9.216 MHz. Its instructions, written in C and assembly language, are contained in a socketed EPROM, and data is stored in self-contained static RAM.
- Page 5 INITIATE key: This key is used to turn ON the output of the test set. The LED in the key indicates that the MAC-20 is attempting to turn the output ON, but other conditions (such as interlocks) could keep the output from actually turn- ing on.
- Page 6 Section III – MAC-20 ============================================================================== indicates that output is not being turned on by the MAC-20, but other condi- tions could cause output voltage to be ON. Use of this key is usually necessary only when in MAINTAIN mode, and it is necessary to abort the test before the breaker trips.
- Page 7 If the output was initiated by the MAC-20, it is turned OFF. NOTE: in C.L. mode only, the contacts jacks may be used for remote initiation (see below).
- Page 8 "OVER", indicating an overrange condi- tion. If this happens, select the next higher range. Pressing any range switch will also RESET the MAC-20. 5 KA range key: This key selects the 5.000 KA range, for output currents up to about 5,000 amperes.
- Page 9 Electrical Test Instruments MAC-20 Section III – MAC-20 ============================================================================== unless a preset value is set in CYCLES timebase. SERIAL port: This standard serial port may be connected to a printer, com- puter, or other device to print or store time and current values of test results in ASCII format.
- Page 10 HANDLING STATIC SENSITIVE ELECTRONIC COMPONENTS. KEYBOARD / DISPLAY BOARD: This large PC board, located on the front panel, contains both LED displays and all keys used in the MAC-20. It also contains an audible beeper, and circuitry for the continuity light, contacts sensing, and output initiation.
- Page 11 Electrical Test Instruments MAC-20 Section III – MAC-20 ============================================================================== Figure II-2: MAC-20 Front Panel TIME CURRENT TERMINAL Electrical Test Instruments, Inc. SERIAL PORT Model MAC-20 Monitor Ammeter Controller ============================================================================== Copyright(C) 1994-2004 Electrical Test Instruments, Inc. All Rights Reserved Page III-10...
- Page 12 SERVICE INFORMATION AND DOCUMENTATION MAINTENANCE AND CALIBRATION OF THE MAC-20 The MAC-20 is manufactured using solid state components that should not re- quire extensive maintenance. However, the accuracy of the MAC-20 is critical to the testing of circuit breakers, and is dependent upon the output of an air- core current sensing coil, which could change due to movement caused by shock or vibration encountered in transporting the test set.
- Page 13 1% of range, internal zero adjustment may be required. 6. Set MAC-20 Range to 1000 A, and adjust output of breaker test set to ex- actly 800 Amperes. If Coarse Tap is 1, and Output Control Vernier is less than 50%, additional resistance must be added to output circuit.
- Page 14 Electrical Test Instruments MAC-20 Section III – MAC-20 ============================================================================== PARTS LIST (MAC-20): The overall schematic is on the following pages. The parts list is provided below. Please refer to both when ordering replacement parts. ITEM QTY DESCRIPTION REF DES Part Number...
- Page 15 Electrical Test Instruments MAC-20 Retrofit Package Section III – MAC-20 =============================================================================================================== OVERALL SCHEMATIC (MAC-20): ============================================================================================================= Copyright(C) 1994-2003 Electrical Test Instruments, Inc. All Rights Reserved...
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Page 16: Warranty
Electrical Test Instruments. The foregoing is in lieu of all other warranties expressed or implied, and all other obligations or liabilities whether arising under contract, negligence or otherwise, on the part of Electrical Test Instruments.
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