Model 53U Multi Power Monitor■ Single-phase/2-wire and 3-wire, three-phase/3-wireand 4-wire systems■ Three line measured value/bargraph indicators
plus energy count/info display■ Modbus, Ao, Di/Do options■ Up to 31st harmonic distortion measurement■ Software lock
■ IP 50 front panel

M-System model 53U is a 96-mm-square Multi LCD
Power Monitor mounted on a panel surface.
One model can be used for single-phase/2-wire and3-wire, three-phase/3-wire and 4-wire systems. Users
can freely choose and program major variables such likeAC voltage/current, active/reactive power, power factor,
AC frequency deviation, apparent power, active/reactiveenergy and up-to-the-31st harmonic distortions.
Measured variables also include the maximum/minimum/
average values, in total of 500 types. Up to 1800 patterns of display combinations are available.
All measured variables can be transmitted to the host PC
via RS-485/Modbus RTU. Conversion factors, system
configuration, interval times are programmable using thePC Configurator Software locally or remotely. Measuredvalues, counter values, setting data are stored in thenon-volatile memory at the power off.

User-Friendly PC Software Setting
Save yourself much time using the free PC Configurator software(model: PMCFG) to create, saveand download your own
parameter settings.
Local (RS-232C) orNetwork (Modbus RTU)

An open collector output can be used for energy countpulse or limit alarm trip. Pulse rate for energy count canbe specified. The contact output can be simulated fortesting the connected device.
External open collector input is typically used to reset energy count memory. The signal can be also monitored at
the host system via Modbus, so that the host can start/
stop monitoring according to ON/OFF status of a load(e.g. motor running or not).
Four analog output option (4-20 mA or 1-5 V) is alsoavailable instead of Modbus and Di/Do interface. Users
can choose and program four among major variables,e.g. 1 VT plus 3 CT, to be converted into analog outputs,
thus eliminating needs for four independent single function transducers.
For M-System product information and downloadable
data sheets, visit M-System web site at: www.m-system.
co.jp.

Monitoring and Storing
Measured/Computed Values on the PC
The PC Recorder LightMSR128LU dedicated for the53U / L53U is free for downloading from our web site.

Multi Power Monitor
53U

RS-232C/
RS-485 Converter
R2K-1
Modbus RS-485
Monitoring window for real-time, instantaneous values, max/min values,
energy and harmonic distortions

Configuration window for quick and easy
viewing/setting of basic parameters

M-SYSTEM CO., LTD. — www.m-system.co.jp — info@m-system.co.jp

Multi Power Monitor 53U

L53U

Product Bulletin 53U_UL_R0_130904

www.m-system.co.jp

FRONT DISPLAY FUNCTIONS
500 types ofmeasured variables;
1800 combinations

Information display
Shows the energy count in normal conditions.
Variable type in alarm condition is displayed when an alarm is triggered.
Parameter type is displayed in the setting mode.

Normal mode : Energy count display

Bargraphs
Each measured variable isrepresented in percentage.

Alarm mode : Alarm trip display
Display flashes
while the alarm is on.

Configuration mode : Parameter display

SPECIFICATIONSProgrammable for either alarm or energy count.

■ STANDARDS & APPROVALS
CE conformity:
EMC Directive (2004/108/EC)
EMI EN 61000-6-4: 2007
EMS EN 61000-6-2: 2005
Low Voltage Directive (2006/95/EC)
EN 61010-1: 2001
UL approval:
UL/C-UL general safety requirements
UL 61010-1: 2005
CAN/CSA-C22.2 No.61010-1: 2004
IEC standard: (applicable with Option /H)
IEC 62053-22: 2003 class 0.5s
IEC 62053-23: 2003 class 2

EXTERNAL DIMENSIONS unit: mm (inch)
96 (3.78)

23(.91)80 (3.15) [12 (.47)]

92 (3.62)

1002 (.08)

GASKET(3.94)dia.

92 (3.62)■ OUTPUT• Modbus RTU
Communication:
Half-duplex, asynchronous, no procedure
Interface: Conforms to EIA RS-485
Max. transmission distance: 500 meters
Baud rate: 1.2-38.4 kbps
Max. number of slave nodes: 31• DC Current: 4-20 mAdc
Load resistance: ≤270 Ω• DC Voltage: 1-5 Vdc
Load resistance: ≥5000 Ω• Open Collector: 130 Vdc @30 mA

3 (.12)The status can be monitored on the Modbus; usable
to reset energy count or to update average (demand)value.

■ PERFORMANCE
Accuracy (in % of span)
Voltage/current: ±0.3% (Option /H: ±0.2 %)Power: ±0.5%Power factor: ±0.5%
Frequency: ±0.1%
Energy: ±1% (Option /H: ±0.5%)
Harmonic contents: ±1%
Analog output: Accuracy of assigned measurand or ±0.2 %,whichever is greater.
Response time: ≤2 sec. (0-99 %)≤3 sec. for frequency/harmonic contents
Sampling time: ≤600 msec.
≤1.1 sec. for frequency/harmonic contents
Insulation resistance: ≥100 MΩ with 500 Vdc

96 (3.78)■ INPUT
Frequency: 50/60 Hz (45-65 Hz)
Voltage Input
Line-to-line (delta voltage): 480 V
Line-neutral (phase voltage): 277 V
Current Input: 1 A or 5 A
Contact Input: 24 Vdc or 110 Vdc

Dielectric strength: 4000 Vac @1 minute(voltage input or current input or contact input or contact output or network interface orconfigurator jack or analog output to power)
2500 Vac @1 minute (voltage input to current
input to contact input to contact output tonetwork interface or configurator jack or
analog output)
2000 Vac @1 minute (circuits to housing)Operating temp.: -10 to +55°C (14 to 131°F)
Storage temp.: -20 to +80°C (-4 to +176°F)
Operating humidity:
90% RH max. (non-condensing)
Mounting: 1/4 DIN panel ﬂush mount
Degree of protection: IP 50 (front)
IP 30 (terminal block and housing)
Weight: 300 g (0.66 lb)

3(.12)■ MEASURED VARIABLES
Voltage: 1-N, 2-N, 3-N, 1-2, 2-3, 3-1
Current: 1, 2, 3, N
Average current: 1, 2, 3
Active/reactive/apparent power: 1, 2, 3, ∑Power factor: 1, 2, 3, ∑Frequency
Phase angle between voltages: 1-2, 2-3, 3-1
Active energy incoming/outgoing: ∑Reactive energy inductive/capacitive: ∑Apparent energy: ∑Power intervals (demand) and other demands
Harmonic contents: 2nd to 31stMax. and min. values

MOUNTING BRACKETSpecifications are subject to change without notice.

Your local representative:■ INSTALLATION
Auxiliary power input:
100-240 Vac (operational range 85-264 V)
47-66 Hz, <8 VA
M-SYSTEM CO., LTD. — www.m-system.co.jp — info@m-system.co.jp

Product Bulletin 53U_UL_R0_130904