NDMeter Cube400 User manual

Cube400
Installation Guide
October 2008
1 Safety
This instruction sheet gives details of safe installation and operation of the Cube400 electricity meter. Safety may be
impaired if the instructions are not followed. Labels on each meter give details of equipment ratings for safe operation.
Take time to examine all labels before commencing installation. Safety symbols on the meter have specific meanings.
Refer To User Manual Risk of Electric Shock
WARNING
The meter contains no user serviceable parts.
Installation and commissioning should only be carried out by qualified personnel
Further information is available for download at http://www.ndmeter.co.uk.
2 Mounting In a Panel
Panels should be 1mm to 4mm thick with a square cutout of 92mm (+0.8/-0.0mm). Insert the meter from the front of the
panel, slide the panel clips from the rear of the case and push firmly against the panel ensuring even pressure on each
clip.
3 Standard Connections
3-Phase 3 or 4-Wire (*Optional Neutral) 3-Phase 3-Wire (2 CTs)
3-Phase High Voltage (HV) Single Phase

4 Display Menus
+
Enter/Exit Quality Menu 5
A





 V


kVAr
3-Phase

 kVA
 kW

kWh


RMS Phase Amps RMS Phase Volts System Power1 Real Energy (kWh)4
Amps Quality Menu
/ Next/Prev
Pk hold A



L-L

 V




 kW

kVArh


THD

 A%


Peak Hold Amps RMS Line-Line Volts Per-Phase Real Power Reactive Energy (kvarh)4 Total Amps % Distortion
A
T-Avg



Pk hold

 V


bal
A
3-Phase

 Hz
 Cos

KVA h



 A%

Harmonic

Time-Averaged Amps Peak Hold Volts System Page 21 Apparent Energy (kVAh)4 Amps Harmonics 2-15
Pk hold A
T-Avg



T-Avg

 V


KVA








Volts Quality Menu
/ Next/Prev
Peak Time-Averaged Amps Time-Averaged Volts Per-Phase Apparent Power Hours Run 2
Pk hold
T-Avg

 V


KVAr





Export kWh


THD

 V%


Peak Time-Averaged Volts Per-Phase Apparent Power1 Export Real Energy4 Total Volts % Distortion


 Cos

Export
kVArh



 V%

Harmonic

Per-Phase Power Factor1 Export Reactive Energy4 Volts Harmonics 2-15
MD kVAr
3-Phase

 kVA
 kW

Power Mean-Demand1
Pk hold MD kVAr
3-Phase

 kVA
 kW

Peak-Hold Mean-Demand1
Note 1: A display of after a value indicates a capacitive load.
Note 2: The Hours Run register accumulates the total time during which the real power (kW) exceeds a preset level.
This is always displayed with a resolution of 0.1hour.
The percentage level of kW at which the Hours Run register accumulates is user programmable from 1% to 100% of full
scale current.
Note 3: Press and together and hold for 2 seconds to reset the displayed value. This feature may be disabled
before mounting in a panel.
Note 4: Scaling of the energy registers is set by the nominal input currents and voltages and remains constant during
operation of the meter. Energy registers will each accumulate from zero to 99,999,999 then restart from zero.
Note 5: Power quality menus are optional on some meters.

4.1 Pulse Output Connections
The pulse outputs take the form of isolated volt free
normally open contact pairs. Pulse 1 is associated
with active energy (kWh) and Pulse 2 with reactive
energy (kvarh).
The contacts are isolated from all other circuits (2.5kV
/ 1 minute) and at 50V from pulse 1 to pulse 2.
Pulses can be used as input to remote counters, pulse
loggers, building energy management system etc.
Light emitting diodes and
remain ON during each associated output pulse.
5 Programming
A



Current Transformer Primary
V

L-L

and to enter programming.
or selects from the standard list of settings while is displayed. (List Mode)
or increases or decreases the value while is displayed. (Fine adjust)
and together to toggle between and . Accepts the set value.
Voltage Transformer Primary
MD



Set the integration period in minutes used for the sliding time window MD calculation for kW and
kvar.
or increments or decrements the value. Accepts the set value. Power MD Integration Time
T-Avg



Set the integration period in seconds used for the sliding time window calculation for voltage and
current.
or increments or decrements the value. Accepts the set value. Current/Voltage Average Time


 kW
Set the instantaneous system kW level above which the Hours Run timer will accumulate. Below
this level Hours Run will remain unchanged.
or increments or decrements the value. Accepts the value. Hours Run Trigger Point
kWh



Set the amount of energy (kWh Pls1 kvarh pls2) required to trigger each Pulse Output.
or selects the next/previous Pulse Rate. Accepts the value.
Pulse Rate (kWh per Pulse)



Set the contact closure time for both pulse outputs.
or selects the next/previous Pulse Length from a standard list. Accepts the value.
Pulse On Period (Seconds)



Tests both pulse outputs and associated circuits without the need of a test load.
or starts/stops a test pulse stream. The display shows  (Hold) or . The
counter shows the total number of pulses during the test.
and reset the test counter to zero. exits pulse test mode. Pulse Test Mode

6 Specification
INPUTS
System 3 Phase 3 or 4 Wire Unbalanced Load
Voltage Un 400/230V. 3 Phase 3 or 4 Wire
110/63V & 208/120V optional. Others to order.
Current In 5A from external CTs. 1A optional. Fully isolated
Measurement
Range Voltage 50% to 120%
Current 0.2% to 120%
Frequency Range Fundamental 45 to 65Hz
Harmonics Up to 30th harmonic at 50Hz
Individual to the 15th
Burden Voltage <0.1VA per phase
Current <0.1VA per phase
Overload Voltage x4 for 1 hour
Current x40 for 0.5 second max
DISPLAY
Type Custom, Supertwist, LCD
Data Retention 10 years min. Stores all energy registers & Meter set-up
Format 2 Rows x 4 Digits, 1 Row x 8 Digits + Legends
Scaling Direct reading. User programmable CT & VT
CT Primary programmable from 10A to 25kA
VT primary programmable from 11V to 440kV
Legends Wh, kWh, MWh etc. depending on user settings
AUXILIARY SUPPLY
Standard 230V 50/60 Hz ±15%
Options 110V 50/60 Hz ±15%
Load 2VA max.
Overload x1.2 continuous
ACCURACY All errors ± 1 digit
kWh Better than Class 1 per EN 62053-21 & BS 8431
kvarh Better than Class 2 per EN 62053-23 & BS 8431
kW & kVA Better than Class 0.25 IEC 60688
kvar Better than Class 0.5 IEC 60688
Amps & Volts Class 0.1 IEC 60688 (0.01In – 1.2In or 0.1Un – 1.2Un)
PF ±0.2° (0.05In – 1.2In and 0.2Un – 1.2Un)
Neutral Current Class 0.5 IEC 60688 (0.05In – 1.2In)
PULSE OUTPUTS
Function 1 Pulse per unit of energy
Scaling Settable between 1 & 1000 counts of kWh/kvarh registers
Pulse Period 0.1 sec. default; Settable between 0.1 and 20 sec
Rise & Fall Time < 2.0ms
Type N/O Volt free contact. Optically isolated BiFET
Contacts 100mA ac/dc max., 100V ac/dc max. 0.5W Max Load
Isolation 2.5kV 50Hz 1 minute
MODBUS®Serial Comms (option)
Bus Type RS485 2 wire + 0v. ½ Duplex, ¼ unit load
Protocol MODBUS® RTU with 16 bit CRC
Baud Rate 4800, 9600 or 19,200 User settable
Address 1 – 247 User settable
Latency Reply within 250ms max.
Command Rate New command within 5ms of previous one
GENERAL
Temperature Operating -10°C to +65°C
Storage -25°C to +70°C
Humidity < 75% non-condensing
Environment IP54 standard, IP65 optional
MECHANICAL
Terminals Rising Cage. 4mm2 (12 AWG) cable max.
Enclosure DIN 43700 96 x 96
Material Mablex® with fire protection to UL94-V-O. Self extinguishing
Dimensions 96 x 96 mm x 83.5 mm (72 mm behind panel)
Weight ~ 250 gms
SAFETY
Conforms to EN 61010-1 Installation Category III