WM 253
single phase speed controller
GENERAL DESCRIPTION
and a switch (available for some versions
WM 253 is a manual electronic instrument only) to turn the load on.
designed to control speed and is particu- The instrument is provided with screw ter-
larly suitable for fan applications. It is pro- minal blocks for wires with maximum
WHAT IT IS
vided with a triac output to control a load 2.5 mm2 (one wire per terminal only, in
WM 253 is a manual electronic in- up to 2.5 A. compliance with VDE regulations).
strument designed to control speed Should the charge be in direct current, it is
OPERATION
and is particularly suitable for fan advisable to install a protective fuse so as
applications. The number of motor turns can be adjust- to prevent any damage to the instrument.
ed through a knob on the front panel,
TECHNICAL DATA
which features a grade scale from 0 to
100% of speed. The minimum speed can Housing: self extinguishing ABS with
HOW IT IS MADE
be set through the  min speed set internal snap.
" Housing: self extinguishing ABS trimmer. Size: front panel 75x108 mm, depth
with snap At startup, the instrument supplies the 49 mm.
" Size: front panel 75x108 mm, load the maximum available voltage, corre- Mount: panel mount, with fixing screw (in-
depth 49 mm sponding to the maximum speed, for cluded).
" Mount: panel mount, with fixing about 15 seconds, then it restores normal Protection: front IP50.
screw (included) control functions according to the settings. Connections: on screw terminal block for
" Protection: front IP50 wires max 2.5 mm2 (one wire only per
MECHANICAL MOUNT
" Connections: on screw terminal block in compliance with VDE regulations).
block for wires max 2.5 mm2 (one The instrument is designed for wall mount. Operating temperature:  5& 55 °C;
wire only per block in compliance Drill two or more holes in correspondence (23& 131 °F).
with VDE regulations) of those on the instrument and hold it with Storage temperature:  30& 75 °C;
" Regulation: from 0 to 100% the screws provided. ( 22& 167 °F).
through knob on front panel The operating temperature range allowed Regulation: from 0 to 100% through
" Control output: 2.5 A Triac for correct operation is  5 e 55 °C. knob on front panel.
" Function type: manual control; the Do not install the instrument in moist Control output: 2.5 A Triac.
speed is proportional to the posi- and/or dirty places and by heat sources. It Function type: manual control; the speed
tion of the potentiometer on the was designed for ration in environments is proportional to the position of the poten-
front panel with common/ordinary pollution levels. tiometer on the front panel.
" Regulation type: phase choking Regulation type: phase choking propor-
ELECTRICAL CONNECTIONS
proportional tional.
" Consumption: 3 VA WM 253 is provided with three input/out- Consumption: 3 VA.
" Power supply: 230 Vac, 50 Hz put power lines for the connection to the Power supply: 230 Vac 50 Hz.
230 Vac, the motor (maximum load 2.5 A)
CONNECTIONS
WM 253
1 2 3 4 5 6
POWER SUPPLY load
power
ON/OFF
DISCLAIMER
This manual and its contents remain the
sole property of Invensys Climate Controls
s.p.a., and shall not be reproduced or dis-
tributed without authorization. Although
great care has been exercised in the
preparation of this document, Invensys
Climate Controls s.p.a., its employees or
its vendors, cannot accept any liability
whatsoever connected with its use.
Invensys Climate Controls s.p.a. reserves
the right to make any changes or improve-
ments without prior notice.
Invensys Climate Controls s.p.a.
via dell'Industria, 15
Zona Industriale Paludi
32010 Pieve d'Alpago (BL)
ITALY
Telephone [phone]
Facsimile [phone]
Email [e-mail]
Internet http:/www.climate-eu.invensys.com
7/2000 ing
cod. 9FT41096
WM 253 7/2000 ing 2