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Summary of Contents for Circutor MEG-1000
- Page 1 INSULATION GUARD MEG-1000 (Code M15051) INSTRUCTION MANUAL (M98122001-20-19A) CIRCUTOR S.A.
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Page 2: Basic Instructions
BASIC INSTRUCTIONS 1.1.- Delivery spot check This manual is issued to help all the MEG-1000 users to install and use it in order to get the best from it. After receiving the unit please check the following points: (a) Does this device corresponds to your order specifications? (b) Check if any damage was done during the shipment process. -
Page 3: Main Characteristics
MEG-1000 2.- MAIN CHARACTERISTICS MEG-1000 is an electronic device that measures the insulating resistance between the ground and one phase of an insulated neutral network (IT). The insulating resistance value shows on a double scale galvanometer, which the equipment selects automatically depending on the value. -
Page 4: Installation And Start-Up
MEG-1000 Two output relays with temporisation adjustment are available: high resistance relay (NORMAL) and low resistance relay (ALARM). The trip value and the delay can be adjusted on each relay. The adjustment is done by means of three rear ↑... -
Page 5: Installation
MEG-1000 3.1.- INSTALLATION Before applying AC power to the instrument, check the following points: a.- Auxiliary voltage supply: 230 Va.c. ± 20 % - Connection terminals: A1-A2. - Instrument consumption: 2.8 VA. b.- Measuring network structure: A.C. insulated or impedant neutral network (IT) with phase-ground voltage ≤... - Page 6 The supply and measuring voltage circuits will be both connected through a wire with a minimum cross-section of 1 3.2.- MEG-1000 CONNECTION 3.2.1.- Connection terminals Name...
- Page 7 MEG-1000 3.2.2- Wiring diagram Page nº 6...
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Page 8: Operation Mode
MEG-1000 .- OPERATION MODE The user is informed about all the parameters by means of: • Double scale galvanometer, that shows the value of the insulating resistance (1). • 5 front plate leds: MΩ (2) and kΩ (3) leds indicate the measuring scale. - Page 9 MEG-1000 The operation mode of the insulating guard is the following: 1. The device applies 24 Vd.c. voltage between the phase (R connection terminal) and the ground (E connection terminal) and measures the current. 2. The insulating resistance value, that is showed in the front plate galvanometer (1), is obtained from the voltage and current values.
- Page 10 MEG-1000 • ALARM relay While the insulating resistance is lower than the adjusted trip value the ALARM relay keeps de-activated. If the resistance being measured is higher than the adjusted trip value the relay is activated after a set time.
- Page 11 MEG-1000 4.2.- EQUIPMENT ADJUSTMENT The equipment has three rear push buttons in order to adjust the ALARM and NORMAL values and their corresponding temporisation: • MODE push button MODE push button gives access to different adjustments and allows to pass from one adjustment to the other.
- Page 12 MEG-1000 The pointer and the scale leds (kΩ (2) and MΩ (3)) show the delay time when it is being adjusted: ALARM relay temporisation. Each 100 kΩ means a trip delay of 1 second. The active measuring scale is the kΩ scale. The adjusting range is within 0.1 and 3 s.
- Page 13 MEG-1000 OPERATION MODE Press MODE ADJUST OF THE “ALARM” RELAY TRIP VALUE ↑ ↓ ALARM led blinks. Adjust the value by means of Press MODE ADJUST OF THE “ALARM” RELAY DELAY TIME ↑ ↓ ALARM and TIME leds blink. Adjust the value by means of Press MODE ADJUST OF THE “NORMAL”...
- Page 14 MEG-1000 • Quick adjustment mode Besides of the explained adjusting mode, the instrument has a “quick adjustment” where the next default values are loaded: ALARM relay trip value ....440 kΩ ALARM relay delay time ....0.5 s NORMAL relay trip value ....3 MΩ...
- Page 15 MEG-1000 Output relays Relays: ALARM (15-16-18) and NORMAL (25-26-28). Type: mechanical, 3 terminals, free of voltage. Use: AC11 250 V/8 A Isolation between contacts: 1000 Va.c. between coil and contacts: 4000 Va.c. Relays temporisation adjustment ALARM relay: from 0.1 to 3 s.
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Page 16: Safety Considerations
MEG-1000 Dimensions: Panel hole: 92 mm +0.8 x 92 mm +0.8 7.- SAFETY CONSIDERATIONS installation specification described previous chapters named INSTALLATION AND STARTUP and SPECIFICATIONS. Note that with the instrument powered on, the terminals could be dangerous to touching and cover opening actions or elements removal may allow accessing dangerous parts. -
Page 17: Maintenance
MEG-1000 8.- MAINTENANCE The MEG-1000 does not require any special maintenance. No adjustment, maintenance or repairing action should be done over the instrument open and powered and, should those actions are essential, high-qualified operators must perform them. Before any adjustment, replacement, maintenance or repairing operation is carried out, the instrument must be disconnected from any power supply source.
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