mdc user manual
TRANSCRIPT
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Users Manual for
MD Controller.
Indotech Industrial Solutions Pvt.Ltd1/2 Ankur Plaza Mumbai Banglore Highway Bridge
Warje Pune 411058
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Indotech Industrial Solutions Pvt. Ltd.
MD Controller User Manual V 1.0 2Rising Indotech Shines Technology
CONTENTS
1)Introducing MD Controller2
2)How does it work? .3
3) Product Features4
4) Installation5
5) Device Functionality.6
6) Technical Details..12
5.1) Specifications..12
5.2) Indications and Switches..13
7) Appendices
Appendix A- Maximum Demand Terminology.14
Appendix B- Wiring Diagrams 15
Appendix C- Technical Support..16
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1. Introducing MD Controller.
Non-domestic electrical power users often have to pay a maximum
demand charge in addition to the usual charge for the number of units
consumed. This charge is usually based on the highest amount of
power used during some period (say 30 minutes) during the metering
month.
The maximum demand charge often represents a large portion of the
total bill and may be based on only one isolated 30-minute episode of
high power use. Monitoring power use and turning off or reducing non-
essential loads during such periods of high power use can realize
considerable savings. The ETMD-04 is a realistically priced stand-alone
controller suitable for small to medium consumers wishing to reduce
their maximum demand in an economical and simple manner. The unit
can also be used for reducing cable and transformer loadings.
Apart from this ETMD-04 gives you a runtime Power usage and
continuous monitoring of Voltage, Current, and Power in kVA. On a
LCD display panel it shows the continuously varing readings.
At the controlling end ETMD-04 comes with the facility to control
certain activities of the plant. This can be achieved by giving the
threshold values of MD to the ETMD-04 via a keyboard. So in the
process of monitoring if it detects current MD grater than or closed to
user set MD then it can trip the switches or MCBs as per requirement.
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2. How does it work?
MD controller works on principle of instantaneous readings of voltage
and current and calculating power in kVA. At the same time systems
Real Time Clock will keep track of time and calculates present MD.
Then according to the logic the current MD and the MD configured by
user is compared and the predefined load tripping action is taken.
After a predefined time it again calculates the MD. Now if the
calculated MD is less than the current MD then it reconnects the load
in proper sequence and if it is greater than the current MD then it trips
the next load. This action continues forever and thus the total load
gets controlled and the desired MD is restricted from reaching its
maximum limit.
In this manner a record of the average power use over the last 15
minutes is obtained in a so-called "sliding window". The ETMD-04 is
also available on request with a 15 or 30 min sliding window. The
controller compares this running average with a set target load value
and operates a set of relays if the target appears in danger of being
exceeded. The relay contacts are used to switch off non-critical
electrical loads and hence hold the overall load to a prescribed limit.
The unit also records the highest value of running average load to date
and operates an alarm relay when a new high is recorded. A visual
display is provided of the running average which can also display the
target value or the recorded maximum on request.
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3. Product Features
Sr.No.
Description
1 Advanced micro controller technology.
2
Display of rms voltage, current, average &
instantaneous demand, at a time.
3Selectable display of maximum demand with date and
time.
4 Adjustable integration time 30/15 min.
5 Adjustable on and off delay.
6 Password protection for setting.
7Step less MD setting up to 500 KVA.
8 Programmable CT ratio.
9 4 Potential free contacts for tripping different loads.
10 *Interfacing to PC through RS232 is possible.
* Optional Feature
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4. Installation
Electrical Connections
WARNING The MD Controller is to be used by qualified
personnel only. Do not install the ETMD-04 on
a power line unless you are qualified to do
so. High voltages that can cause burns and lethal
shocks are present when working on live power
line.
To assure operator safety, when making
connections to power lines, always start by
connecting the instrument power, which contains
the safety earth ground.
In order to install ETMD-04 at the clients end, one should follow the
procedure provided in user manual: -
Check the clients mains supply; get a clear idea about the power flow of
the existing plant.
Do the power connections as prescribed in the approved drawings.
(You can refer to the wiring diagram given in appendix A.)
Check the CT directions.
Adjust the CT ratio as pr the requirement.
Make connections of the loads as per requirement.
Check the calibration for voltage as well as current.
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5. Device Functionality
It describes the user not only how to operate the system but
also gives a clear idea about the all the indications.
Lets start with the key functionality; on the front panel of the
PMR we have total five keys. Their functions are as below:
Auto/Manual Key : This key gives the provision to user
for shifting from auto to manual and vice-versa.
In manual mode the pages are displayed manually by
using UP-DOWN arrow keys.
In auto mode the pages will automatically scrolled at
predefined refresh rate.
Theses keys are used to scroll the display UP and DOWN.
The same keys are used as Yes and No keys for the
setting confirmation option.
The fourth key is a SET key. It is used for entering into
the configuration mode.
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Apart from these keys the front panel also consists of some LED
message information. There are total of five LEDs, out of which one is
POWER indication LED and four are load indications LEDs.
The output relays are connected to the load control circuits inwhichever safe and reliable manner the user deems desirable.
Relay 1 is the lowest priority relay and is the first to operate in the
event of load shedding being required therefore use it to control loads
that are generally unimportant. Relay 2 is the next highest priority and
should control loads of slightly higher priority. Relay 3 operates when
the target has been exceeded and should be connected to loads of
high priority.
For better understanding of the device please refer the Page
Sequence diagrams in following pages.
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Auto Mode
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Manual Mode
R_Phase_Details
R_Phase_Details234.5V 0025 A
Y_Phase_Details
B_Phase_Details
Y_Phase_Details238.5V 0055 A
B_Phase_Details240.5V 0040 A
Total_KVA
Total_Power
0164KVA
A/M
Selecting
Auto Mode
SET
Entering into
Configuration Mode
A
B
D
E
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Set and CurrentMD Details
Maximum_MDDetails
Set MD Curr.MD500KVA 150KVA
Max. MD192KVA
Instantaneous_MD220KVA
Instantaneous MDDetails
A/M
SelectingAuto Mode
SET
Entering into
Configuration Mode
A
C
B
D
E
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Configuration Mode
*Press to SET accept and A/M to reject.
Entering
Confi uration Mode
Select MD Delay
UP DOWN
Set Delay 10
minutes.
Set MD 125 KVA
A/M SET A/MSET
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6. Technical Details
Specifications
Sr.No.
Particulars Specifications
1 Power Supply 12 Volt DC @ 1A.
2 Measured Voltage Range 0-500 Volt AC (P-N)
3 Measured Current Range 0-1000 Amps, AC RMS/Phase
4 Phases Measured 1Ph / 3Ph-4 Wire
5 Display 16 Char, 2 Line Display
6 Operating Temperature -15 to 60C
7 Physical Dimensions (LxBxH) mm(110x192x96) mm
8 Weight 1 KG.
9 IP Protection IP 43
10 Mounting Panel Mountable
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Indications and Switches
Indications
Indications
LEDs ON OFF
L1 Load 1 ON Load 1 OFF
L2 Load 2 ON Load 2 OFF
L3 Load 3 ON Load 3 OFF
L4 Load 4 ON Load 4 OFF
Switches + Keys
Particulars Purpose
ON/OFF switch Power ON / OFF
A/M KeyAuto/Manual Parameter
Scanning Mode Selection.(NO for Confirmation)
Up Key UP Scrolling
Down Key DOWN Scrolling
SET
To Enter into Configuration
mode. (NO for Confirmation)
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Appendix A: Maximum Demand Terminology.
Set MD :
It is the user configurable demand at which the user wishes to limit
his Maximum demand. (This is an instantaneous value and theloads will be cut-off after the load exceeds the set value)
Current MD::
It is the Maximum Demand of the user integrated over the period of15 min or hour as prescribed by the respective supplyingauthority.
Maximum MD :
It is the highest value of the Current MD during the specifiedperiod, it can be cleared by the user. At the rear side of the device
a RESET key is provided to reset these readings after it is checked.
Instantaneous MD :
It is the highest value of Instantaneous Demand placed by the
users load on the supply system during the specified period, it canbe cleared by the user.
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Appendix C: Technical Support.
Contact :
Indotech Industrial Solutions Pvt.Ltd1/2 Ankur Plaza, Mumbai Banglore Highway Bridge,Warje Pune 411058
Tele: 91-20-25232221Fax: 91-20-25231588Email:[email protected]
Web: www.indotechindustries.com