YZ WM1-DIN Technical data

Energy Management
Power Analyzers
Type WM1-DIN

• 3-dgt multi-range µP-based meter

• Scrolling of power, energy,
power factor (cos ϕ), current and voltage

• Automatic selection of k (kilo) or M (mega) scale

• Automatic measurement of peak value

• Double measuring input: Up to 5 A or up to 27 A

• Degree of protection (front): IP 40

• Options: - Programable alarm setpoint output

- Pulse output for connection to remote
display or PLC

- Serial RS 485 output for connection to a
personal computer

Product Description

3-dgt µP-based meter for
measuring power, energy,
power factor (cos ϕ), current
and voltage with automatic
selection of scale. A pro­grammable alarm setpoint

output is available on request.
The housing is easy to
mount on DIN-rail and offers
a degree of protection (front)
of IP 40.

Type Selection

Range code

27A: 5 AAC or 27 AAC

selectable

1)

on request

Power Supply

C: 115 VAC, -15% +10%,

50/60 Hz

D: 230 VAC, -15% +10%,

50/60 Hz (standard)

Set-points

0: no alarm
1: one alarm

1)

Input Specifications

Accuracy

(@ 25°C ± 5°C, R.H. ≤ 60%) ± 2 % f.s., ± 2 dgt

Temperature drift ± 250 ppm/°C,
Display 7-segment LED, h 14.2 mm,

Decimal point position Automatic selection and

Max. and min. indication Max.: 999, Min.: 0
Overflow indication “oF”
Input

Current 27 AAC permanent, direct

Voltage (48 to 62 Hz) 400 VAC (1-phase conn.)

3 digits

indication of ”k” or “M” range.

conn. max. 32 AAC for
2 minutes.
5 AAC permanent, CT conn.
max. 6 AAC for 2 minutes

500 VAC (3-phase conn.)

Ordering Key

Model
Range code
Measurement
Power supply
Setpoints
Option

Options

XX: None (1-phase/

3-phase system with
neutral, balanced load)

TX: Measurement on

3-phase system with­out neutral (balanced
load)

PX: Pulse output (available

only without alarm)

Input (cont.)

Type 1-phase/3-phase with neu-

Wave form Undistorted sine wave

Impedance

Voltmeter input: ≥ 1 MΩ
Ammeter input: 1 mΩ (27 A)

Key-pad enable input By means of external, volta-

WM1-DIN27A A D0XX

RX: RS 485 serial interface

(1-phase/3-phase
system, with neutral
and balanced load)

SX: RS 485 serial interface

(3-phase system, with­out neutral and with
balanced load)

tral, balanced load (standard)
3-phase without neutral,
balanced load (on request)

(form factor 1.11)

6 mΩ (5 A)

ge free NC contact. The in­put is not insulated from the
measuring inputs.
Can be used to avoid un­wanted programming modifi­cations, resets and totalized
energy.

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WM1-DIN

Input Specifications (cont.)

Measurements

Voltage, current,

, or V

instantaneous power V

L-N

, I, W, VA, VAR

L-L

(max. display: 999M-)

Peak value Accessible by means of the

key-pad in run mode.

Energy Wh, VAh VARh

(max. display: 999 M-)

Power factor - cos ϕ Accuracy: ± 4 dgt @ 25˚C,

voltage ≥ 3% f.s.
current ≥ 10% f.s.
Display: L.10/1.00/C.10;
In case of voltage and/or
current lower than 3% f.s.,
the display flashes “1.00”

Reset date updating Month and day of the last

reset manually programmed
by key-pad

Primary range Transformer ratio program-

mable from 1 to 999
(max. 5000/5A).

Output Specifications

General Specifications

Operating temperature 0° to 50°C (32° to 122°F)

(R.H. < 90% non-condensing)

Storage temperature -10° to 60°C (14° to 140°F)

Insulation reference voltage 300 V
Dielectric strength 4000 V
EMC EN 50081-1, EN 50082-1
Safety standards EN 61010-1, IEC 61010-1,

Connector Screw-type
Housing

Dimensions 89 x 71.5 x 58.5 mm

Material ABS,

Degree of protection IP 40 (front)
Weight Approx 320 g
Approvals CE

(R.H. < 90% non-condensing)

to ground

rms

rms

for 1 minute

VDE 0411

(4 DIN-modules)

self-extinguishing: UL 94 V-0

Alarms (on request)

Number of setpoints 0 standard (1 on request).
Setpoint adjustment From 0 to 999 MW/MVA/

MVAR/instantaneous power,
MWh/MVAh/MVARh
energy and from L/C. 10 to

1.00 cos ϕ key-pad program-

mable
Accuracy ± 2%
Hysteresis 0 to 100% f.s.

key-pad programable
Time delay adjustment 0 to 255 s

key-pad programable
Alarm type Low or high

key-pad programable
Output type Static by TRIAC. (24 VAC to

250 VAC/max. 50 mA).
Insulation 2 kV between alarm output

and all inputs and serial out -

put (if available)

Pulse output (on request)

Type

Insulated, open collector: V

= 0.6 VDC/max. 4 mA

ON

max. 20 VDC

V

OFF

Pulse: ON status 200 ms

OFF status 800 ms min.-

NPN output
Pulse number From 1 to 999 pulses for

kWh, kVAh or kVARh
Insulation 2 kV between output and

all inputs and serial output if

available

Serial output (on request)

Type One-way multidrop RS 485

(double direction: only for
standard static TRIAC output)

Addresses 256 adresses

key-pad selectable.

Data W, VA, VAR, Wh, VAh, VARh,

V, I, cos ϕ and setpoint status
where present

Data format 1 start bit - 7 data bit -

even parity - 1 stop bit.
1 start bit - 7 data bit ­odd parity - 1 stop bit.
1 start bit - 8 data bit ­no parity - 1 stop bit

Baud-rate 1200, 2400, 4800 and 9600

bauds, key-pad selectable

Connections 2 wires (max. length: 1200 m)

+ shield.
Bias and/or line termination
(selectable by DIP-switch).

Power supply Separate 5 VDC, power

consumption 70 mA (PSU­DIN module).

Insulation By means of optocouplers,

2 kV between serial output
and measuring inputs.
2 kV between 5 VDC power
supply input and measuring
inputs.

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