ES-3358 Rev.11
LTRPN
Power Transducer Series LT-UNIT
VAR TRANSDUCER
(self-powered)
Functions & Features
• Providing a DC output signal in proportion to AC reactive power
• DC output containing little ripple is ideal for computer input
• "Time division multiplication" method accepts distorted waveforms
• Isolation up to 2000 V AC
• High-density mounting
• Conforms to IEC 60688
• No auxiliary power supply required
Typical Applications
• Centralized monitoring and control of power management system in a manufacturing facility or building
MODEL: LTRPN–[1][2][3][4][5][6]
ORDERING INFORMATION
• Code number: LTRPN–[1][2][3][4][5][6]
Specify a code from below for each of [1] through [6].
(e.g. LTRPN-115PA/T/Q)
• Special output range (For codes Z & 0)
• Specify the specification for option code /Q
(e.g. /C01)
• Use Ordering Information Sheet (No. ESU-3355).
[1] CONFIGURATION
1
: 3-phase / 3-wire
4
: 3-phase / 4-wire
[2] VT INPUT (balanced load)
For 3-phase / 4-wire, phase voltages (e.g. 110 V / √3 ) are used.
1
: 110 V AC
2
: 220 V AC
4
: 220 V / 380 V AC (3-phase/4-wire only)
[3] CT INPUT (unbalanced load)
Current
1:
1 A AC
2:
2 A AC
5:
5 A AC
[4] OUTPUT SIGNAL POLARITY
P:
Negative in lag, positive in lead
M:
Negative in lead, positive in lag
[5] OUTPUT
Current
A:
4 – 20 mA DC (Load resistance 500 Ω max.)
FW
: -10 – +10 mA DC (Load resistance 1000 Ω max.)
GW
: -1 – +1 mA DC (Load resistance 10 kΩ max.)
JW
: -5 – +5 mA DC (Load resistance 2000 Ω max.)
Z
: Specify current (See OUTPUT SPECIFICATIONS)
Voltage
6
: 1 – 5 V DC (Load resistance 5000 Ω min.)
1W
: -10 – +10 mV DC (Load resistance 10 kΩ min.)
2W
: -100 – +100 mV DC (Load resistance 100 kΩ min.)
3W
: -1 – +1 V DC (Load resistance 1000 Ω min.)
4W
: -10 – +10 V DC (Load resistance 10 kΩ min.)
5W
: -5 – +5 V DC (Load resistance 5000 Ω min.)
0
: Specify voltage (See OUTPUT SPECIFICATIONS)
[6] OPTIONS (multiple selections)
Terminal Cover
blank
: Without
/T:
With
Other Options
blank
: none
/Q
: Option other than the above (specify the specification)
SPECIFICATIONS OF OPTION: Q
COATING (For the detail, refer to our web site.)
/C01
: Silicone coating
/C02
: Polyurethane coating
/C03
: Rubber coating
GENERAL SPECIFICATIONS
Connection
: M4 screw terminals (torque 1.2 N·m)
Screw terminal:
Chrome-plated steel
Housing material
: Flame-resistant resin (black)
Isolation
: Voltage input to current input to output
Computation
: Time division multiplication
Overrange output
: Approx. -10 to +120 % at 1 – 5 V
Zero adjustment
: -5 to +5 % (front)
Span adjustment
: 95 to 105 % (front)
INPUT SPECIFICATIONS
Frequency
: 50 or 60 Hz
■
VOLTAGE INPUT
Operational range
: 85 – 110 % of rating
Overload capacity
: 150 % of rating for 10 sec., 110 % continuous
■
CURRENT INPUT
Operational range
: 0 – 120 % of rating
Overload capacity
: 4000 % of rating for 1 sec., 2000 % for 4 sec., 120 % continuous
■
How To Determine Var Range
Calibration Range [var] = (Measuring Range) ÷
((VT Ratio) × (CT Ratio))
Check that the required calibration range is within the available range in the table.
[example]
3-phase / 3-wire, measuring range 75 kvar,
VT 220 / 110 V, CT 250 / 5 A
(75 × 10
3
[var])÷((220 ÷ 110) × (250 ÷ 5))= 750 [var]
OUTPUT SPECIFICATIONS
■ DC Current
: -10 – +20 mA DC
Span
: Min. 1 mA, max. 20 mA
Offset
: Max. 1.5 times span
Load resistance
: Output drive 10 V max.
■
DC Voltage
: -10 – +12 V DC
Minimum span
: 5 mV
Offset
: Max. 1.5 times span
Load resistance
: Output drive 1 mA max. at ≥ 0.5 V
INSTALLATION
Operating temperature
: -10 to +55°C (14 to 131°F)
Operating humidity
: 30 to 85 %RH (non-condensing)
Mounting
: Surface or DIN rail
Weight
: 450 g (0.99 lb)
PERFORMANCE in percentage of span
Accuracy
: ±0.5 % (at 23°C ±10°C or 73.4°F ±18°F,
45 – 65 Hz)
Magnetic field (ext. origin) effect:
± 0.5 % (400 A/m)
Response time
: ≤ 2 sec. (0 – 100 % ±1 %)
Ripple
: 0.5 %p-p max.
Insulation resistance
: ≥ 100 MΩ with 500 V DC
Dielectric strength
: 2000 V AC @ 1 minute
(voltage input to current input to output to ground)
Impulse withstand voltage
: 1.2 / 50 μsec., ±5 kV
(input to output or ground)
STANDARDS & APPROVALS
EU conformity
:
EMC Directive
EMI EN 61000-6-4
EMS EN 61000-6-2
Low Voltage Directive
EN 61010-1
Measurement Category II (input)
Pollution Degree 2
Input to output: Reinforced insulation (300 V)
RoHS Directive
CONNECTION DIAGRAM
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]