tAo
: temperature Alarm override.
cPP
: compressor Probe Protection.
Select compressor relay status in case of
room probe defect.
oF = compressor OFF in case of probe de-
fect;
on = compressor ON in case of probe de-
fect;
dc = NOT AVAILABLE.
ctP
: compressor type Protection.
Select the type of (short-cycle) protection
best suited for the compressor; the actual
delay time is programmed with the next
parameter.
nP = no Protection;
don = delay on start; delay applies when
relay is energized;
doF = delay at switching oFf. Delay after
stop, i.e. time between stop and subse-
quent start;
dbi = delay between two successive starts.
Limits the number of start-ups per hour.
cdP
: compressor delay Protection.
The time delay - in minutes - applicable to
the previous parameter “ctP”.
odo
: output delay (at) on.
Time delay - in minutes - applied to activa-
tion of the relays after start-up.
CAL
: CALibration.
Temperature read-out offset to allow for a
fixed adjustment up or down due to probe
location, if desired.
dEA
: dEvice Address.
To select the (address) label of the device in
relation to the supervisory system.
FAA
: FAmily Address.
To select the (family) label of the device in
relation to the supervisory system.
ndt
: number display type.
Visualization number of display.
in = entire;
dE = decimal;
hF = half.
Lci
: Lower current input.
For EWPC 902/R/S, EWPC 902/P/S and
EWPC 902/T/S with current input only.
Read-out corresponding to 4 mA input sig-
nal (factory set at 20 %R.H for EWPC
902/R/S).
Hci
: Higher current input.
For EWPC 902/R/S, EWPC 902/P/S and
EWPC 902/T/S with current input only.
Read-out corresponding to 20 mA input
signal (factory set at 100 %R.H for EWPC
902/R/S).
PAS
: PASsword.
Permits to set the password value.
0 = no password required to enter para-
meter programming;
1…15 = admitted values for the password.
rEL
: rELease firmware.
Code of device version.
Hdc
: Hardware code.
Read-only parameter indicating the hard-
ware code of the device.
tAb
: tAble of parameters.
This shows the configuration of the para-
meters as set in the factory; can not be
modified (for factory identification and di-
agnostic purposes only).
INSTALLATION
The instrument is designed for flush panel
mount. Prepare a 71x29 mm panel cut-
out; insert the instrument through the front
and fasten with the U-bracket supplied
with the unit. The ambient temperature
around the instrument should be kept be-
tween –5…65 °C (23…149 °F).
Do not install the instrument in moist
and/or dirty places or near heat sources; it
is suitable for operation in environments
with an ordinary pollution level.
Leave enough room for air circulation by
the cooling holes of the instrument.
ELECTRICAL WIRING
The instrument is equipped with a screw
terminal block suitable for max 2.5 mm
2
wiring (one wire each terminal only, in com-
pliance with VDE norms). Make sure that
the low voltage power supply matches re-
quirements: 12…24 V
a
/
c
.
According to the type, the probe shall be
connected according to the electric dia-
gram on the instrument body.
In case of Eliwell pressure or humidity
probes connected to EWPC 902/R/S or to
EWPC 902/P/S, bear in mind that two-wire
probes (such as EWHS 28 or EWPA) are
directly supplied by the instrument, while
the 4-wire probe (EWHS 31) needs an ex-
ternal power supplier.
Temperature probes do not require polarity
insertion and can be easily by using com-
mon 2-lead wires (please note that long
probes involve a worse instrument perfor-
mance for EMC electromagnetic compati-
bility: utmost care shall be put in cabling).
Probe cables shall be kept separate from
line voltage and load wires for safety and
EMC reasons. The coordinated European
standards impose that power wires (and
generally, all parts subject to dangerous
voltage) shall be kept separate from very
low voltage with insulation and distances
suitable to ensure at least a double or rein-
forced insulation. EMC requirements sug-
gest/impose to put more care in such
separation by using insulating separate
raceways and proper cable fixing methods.
The relay output is voltage-free and inde-
pendent. Do not exceed the maximum al-
lowed power: 8(3)A 250V
a
. For heavier
loads, an external contactor with suitable
power shall be used.
ERROR ANNOUNCIATION
The instrument is provided with only one
error message “E1”, both in case of short-
ed sensor and in case of sensor break, or
sensor absence. The “E1” error message
also appears in the event of underrange of
the system temperature or in the event of
overrange of the system temperature.
TECHNICAL DATA
Housing
: black ABS plastic, autoestin-
guish.
Dimensions
: front 74x32 mm
(2.913x1.260"), depth 67 mm (2.637").
Parameter
diF
LSE
HSE
Att
HAL
LAL
AFd
PAO
tAo
cPP
ctP
cdP
odo
CAL
dEA
FAA
ndt
Lci*
Hci*
PAS
rEL
Hdc
tAb
* only for EWPC 902/R/S, EWPC 902/P/S and EWPC 902/T/S with current input
2
EWPC 902/S 7/2000 ing
DEFAULT SETTINGS - STANDARD MODELS
Description
diFferential
Lower SEt
Higher SEt
Alarm temperature type
Higher ALarm
Lower ALarm
Alarm (Fan) differential
Power-on Alarm Override
temperature Alarm override
compressor Probe Protection
compressor type Protection
compressor delay Protection
output delay (at) on
CALibration
dEvice Address
FAmily Address
number display type
Lower current input
Higher current input
PASsword
rELease firmware
Hardware code
tAble of parameters
Range
–12…12
–999…999
–999…999
Ab / re
–999…999
–999…999
1…50
0…10
0…250
oF / on / dc
nP /don / doF / dbi
0…15
0…99
–12…12
0…14
0…14
in / dE / hF
–999…999
–999…999
0 / 1…15
/
/
/
Default
–1
–80
600
Ab
0
0
1
10
0
oF
nP
0
0
0
0
0
in
20
100
0
/
/
/
Unit
°C / °F
°C / °F
°C / °F
flag
°C / °F
°C / °F
°C / °F
hours
minutes
flag
flag
minutes
minutes
°C / °F
number
number
flag
°C / °F
°C / °F
flag
/
/
/
