VRE-80M Eight Channel Monitoring Unit
Superintend Master program
USA model
 VRE-80MUS English
60 Hz
Other countries
 VRE-80MD
VRE-80ME
VRE-80MS
VRE-80M		 German
English
Swedish
Finnish
50 Hz
50 Hz
50 Hz
50 Hz


VRE-80M, an eight channel monitoring unit equipped with Modbus protocol and RS-485 serial port. By using Superintend Master program, 8-256 measuring points can simultaneously be supervised.

THE MAIN SPECIFICATIONS ARE:

  • On-line monitoring and display of all 256 channels on Master program
  • Fault current measuring from 1 mA to 12 A
  • Max distance from Master Program (PC) to last monitoring unit 4.000 ft (1200 m)
  • System can also be connected to optical fiber cable
  • All settings, names and other information to each channel can be done by buttons on VRE-80M unit or by PC using Superintend Master Program
  • Trend curve for each measuring point on Master Program
  • Continuous self testing
  • The Modbus protocol is free
  • Optional extras: Alarm warning 0-90 % of alarm limit

FEATURES:

  • EXTREMELY EASY TO USE AND TO INSTALL
  • FAST LOCATING OF FAULTY CIRCUIT


On-line monitoring of leakage current has proven to be an effective method to maintain a "clean" electrical system. An alarm indicates immediately if wiring errors occur, a device with ground fault is connected to the system or insulation level has deteriorated. Results are:
  • Better fire and personnel safety
  • Improved Power Quality
  • Increased electrical reliability

Possible Applications:

  • Service Entrance
    Both low and high resistance grounded systems can be supervised so that operators are notified of increasing leakage current before the ground fault protection device causes an unplanned shutdown.
  • On-Line Monitoring of Insulation
    Loss of a critical motor, heating element, power cable etc. Can halt an entire production progress. Monitoring enables predicting of insulation faults before the circuit breaker trips.

The new eight channel Superintend monitoring system (VRE-80MUS) monitors up to eight points of the electrical system, including motor control centres, and branch circuits as well as sensitive electronic devices or any grounded device critical to the operation. Relay outputs can be set to operate alarms, signal control systems or operate switches. The Modbus RTU communication port allows remote monitoring and programming of all the VRE-80 features.

A large Ground Fault monitoring system can be set up by using Modbus protocol and the units RS-485 serial port.

Superintend Master program is extremely easy to use. All settings, names and other information to each channel can be made by it. By using the mouse, a separate measuring point can be observed on the screen together with trend curves.

The Modbus protocol is open, so the VRE-80MUS can be integrated into third party SCADA or Building Control systems.


AN EXAMPLE OF MONITORING

Data cable:
one pair shielded cable.
Cable can be a loop or a straight line.
Max. length for the loop is 4.000 ft (1200 m).


CONTINUOUS MONITORING
OF ELECTRICAL INSULATION

Over time leakage current increases because the insulation begins to degrade. By continuous monitoring of earth leakage current, weakened insulation can be identified before the circuit breaker trips and production is shut down.

Typical curve presenting insulation deterioration

Alarm set point can be set two ways:
A. Set the alarm 2-3 times higher than the normal leakage current
B. Set the alarm to 1A

All insulation ages over time. Degradation is accelerated by:

  • Vibration
  • High temperature
  • Humidity
  • Voltage spikes
  • Pollution
  • Starting peak currents and forces

Monitoring insulation of motors, heating systems, ovens, cables etc can be done at one location with the help of Superintend Master Program, Modbus system and RS-485 serial port.


DISPLAY

Main display

The main display mode provides a possibility to view the status of all supervision points and devices simultaneously.
The main display mode includes:

  • Current in the supervision points relative to the set point (numbers 0 … 9)
  • Short duration alarms (P)
  • Over-current and equipment alarms, which are either acknowledged or not acknowledged (A and F)
  • Status of the channel: connected or disconnected (.)
  • Number of the channel connected to the analog output (output 1)

Channel display

Channel display shows the number (1) and name (SUB # 01) of the measuring point, measured current 96 mA.

SETTINGS

1. 2. 3.
1. Hysteresis
2. Time delay
3. Alarm setting


Alarm setting
From 5 mA to 10 A		 Alarm delay setting
up to 95 secs		 Name setting

ALARM DISPLAY

Alarm display:
P= alarm shorter than
time delay setting
A= blinking "A" - letter
Red blinking LED-light
A= blinking "A"- letter
Red blinking LED-ligh

SELF TESTING

Superintend VRE-80 tests continuously the condition of itself and the whole measuring chain. The test of the measuring chain is done at about 1 minutes intervals. If the equipment is in condition the "channel condition" display mode shows "Chann.ok!". If one measuring point has a failure, an "F" character exists in that channel.

MAX/MIN CURRENT READING

Each channel of the monitoring unit has a memory place for highest and lowest measured current. The memory is zeroed at each channel display by pressing "OK". After the measure is zeroed the current will display latest measured current.


DISPLAY ON SUPERINTEND
MASTER PROGRAM

1. Display of all connected devices.
Green light = everything is ok.
Red light = alarm.

By clicking on the screen,
device display is opened:

2. Device display identifies
the alarming channel.
By clicking on the screen,
channel display is opened:

3. For more information
of channel display,
move on to the next page.


CHANNEL DISPLAY

Channel display shows:
1. Name of the measuring point (Channel: VRE-80/PB 21)
2. Current line on the left. Scale 100 mA, 1 A or 10 A. The scale can be either linear or logarithmic.
3. Screen chows the current curve for the past 14 days. Information older than that is automatically saved to the memory of PC. On the screen we can see the current curve of the time from July 7th to July 12th (from 2003-07-07 to 2003-7-12) on the top line.
4. The picture shows power cut on July 10 and alarm ( crossing of set value, red line) on July 11. The following pictures have the same information zoomed in.
1. Current alarm has occured between 11.07 am and 11.16 am. Time line on the bottom.
2. Current value can be seen by clicking the left mouse button when the cursor is placed on the top of the current line. The blue line indicates the measuring point. In this case the current value is 2434 mA.
In the picture the time of power cut is zoomed in. The power cut has occurred between 14.30 and 14.33.

The picture shows deteorated isolation resistance on the leakage current curve. The alarm has been generated at 12.10. The defective device has been switched off at 12.40. Now there is a possibility to start preventive maintenance in time and there is no need for production stops. Note! Thanks the alarm delay there are no unnecessary alarms caused by current spikes.


EACH MEASURING POINT HAS OWN SET-UP DISPLAY FOR SETTINGS


CONNECTIONS OF VRE-80M

The connections on the top of the VRE-80: power and relay (view from the top).
In the Figure the relay is in alarm in state and main unit without power.

NOTE!
Relay output:
USA
Other countries
120 V AC 5 A
250 V AC 5 A


INTERCONNECTION CABLES
WIRING WITH STANDARD MEASURING CABLE

Standard measuring plug-in cables:
USA
 Other countries
VMP-2f
VMP-6f
VMP-16f
VMP-32f		 length
length
length
length		 2 feet
6 feet
16 feet
32 feet		 VMP1
VMP2
VMP5
VMP10		 length
length
length
length		 1 m
2 m
5 m
10 m


WIRING WITH INSTRUMENTATION CABLE

Installation with screw terminals

The VMPH-2F measuring cable for the current transformer is 2-feet long (0.6 m). One end of the cable has a plug connector (for the VRE-80 unit) and the other end has four colour-coded wires for connection to screw terminals on the instrumentation cable.


Installation with plug-in measuring cable

The VMP-2F measuring cable for the current transformer is also two-feet long (0.6 m). Both ends of the cable have plug connectors. The VMPA-1 (one channel model) and VMPA-4 (four channel model) are adapters for VMP-2F measuring cable. The adapter has socket(s) for VMP-2F measuring cable and screw terminal(s) for the instrumentation cable.


INSTALLATION OF DATA CABLE

Datacable between VRE-80MUS devices can be straight line or loop line. Maximum length of cable from RS-232/RS-485 converter to last device is 4000 ft (1200m)

Straight Line

Data cable one pair shielded, twisted, AWG 22

Data cable
Data cable max. Length 4.000 ft ( 1.200 m)

Loop Line





CONNECTING ON VRE-80M UNIT

Plug in terminal Terminal on the top of VRE-80M unit


CONNECTION OF FIBRE OPTIC CABLE



TECHNICAL SUMMARY

Leakage Current Monitor VRE-80
Supply voltage USA 110-120 V +10% 60 Hz
Other countries 230 V +10% 50 Hz
Power consumtion 4.5 VA
Operating temperature +22...+122°F (-5...+50°C)
Storage temperature -4…+158°F (-20…+70°C)
Humidity <95%, non condensing
Dimensions shown on the next page
Installation
- mains and the alarm relay screw terminal, plug in type
- sum current transformer 4-pin modular connector
Weight 1.5 lb (680 g)

Measuring Characteristics
Channels 8
Measuring range 1 mA - 12 A
Resolution -I < 1 A, 1mA
-I > 1 A , 10 mA
Accuracy with
- VMI-xx +5% (closed core) + 1-2 dgt
- VMIK-xx +10% (split-core) + 1-2 dgt
- Window type transformers +20% (split-core) + 1-2 dgt, repeatability +2%
Setup
- alarm range 5 mA – 10 A
- alarm delay up to 95 s
- hysteresis 0-90% alarm level
RS-485 Opto-isolated 3500 V DC
Modbus Standard Modbus Protocol

Alarm Relay
relay connection two potential free, change-over contactors
Imax max 5 A
Vmax 250 V AC
Vmax 24 V DC


DIMENSIONS



Inch (mm)
Weight 1,5 lb (0,68 kg)