26
ENG
“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018
11. TECHNICAL SPECIFICATIONS
Power supply
115…230 Vac (+10/-15%) 50/60 Hz
Power input max (W)
15
Emergency power supply
13 Vdc +/-10% (
If it is installed the optional
Ultracap module for EVD ice, for EVDM011R1*/EVDM011R2*)
Driver
Unipolar valve
Valve connection
6-wire cable AWG 18/22 type, Lmax=1m
Digital input connection
digital input 230 V optoisolated. Closing current: 10 mA
Lmax=10m for residential/industrial environments, 2m for domestic environments
Probe
S1 ratiometric pressure probe (0…5 V):
Resolution 0,1 % fs
Measurement error: 2% fs max; 1% typical
S2 low temperature NTC:
10kΩ a 25°C, -50T90°C
Measurement error: 1°C in the range -50T50°C; 3°C in the range +50T90°C
RS485 serial connection
Modbus, Lmax=500m, shielded cable, earth connection in both side of shielded-cable
Assembly
with screw
Dimensions
LxHxW= 93 x 230 x 41 mm
Operating conditions
-30T40°C (don’t use EVDIS* lower than -20°C); <90% U.R. non-condensing
Storage conditions
-35T60°C (don’t store EVDIS* lower than -30°C), humidity 90% U.R. non-condensing
Index of protection
IP65/IP67
Environmental pollution
2
Temperature for glow wire test
850°C
Immunity against voltage surges
Category
II
Class of insulation
II
Software class and structure
A
Conformity
Electrical safety
: EN 60730-1, UL 60730-1, UL 60730-2-9
Electromagnetic compatibility: EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN 61000-6-4
EN61000-3-2, EN55014-1, EN61000-3-3
Tab. 11.a
PROBLEM
CAUSE
SOLUTION
In the start-up phase the
low pressure protection
is activated (only for self-
contained units)
The “Valve opening at start-up” parameter is set
too low
Check the calculation in reference to the ratio between the rated cooling capacity of the evapo-
rator and the capacity of the valve; if necessary increase the value.
The driver in RS485 network does not start control
and the valve remains closed
Check the serial connection. Check that the pCO application connected to the driver (where fea-
tured) correctly manages the driver start signal. Check that the driver is NOT in stand-alone mode.
The driver in stand-alone configuration does not
start control and the valve remains closed
Check the connection of the digital input. Check that when the control signal is sent that the
input is closed correctly. Check that the driver is in stand-alone mode.
LOP protection disabled
Set a LOP integration time greater than 0 s.
LOP protection ineffective
Make sure that the LOP protection threshold is at the required saturated evaporation temperature
(between the rated evaporation temperature of the unit and the corresponding temperature at
the calibration of the low pressure switch) and decrease the value of the LOP integration time.
Solenoid blocked
Check that the solenoid opens correctly, check the electrical connections.
Insufficient refrigerant
Check that there are no bubbles in the sight glass upstream of the expansion valve. Check that
the subcooling is suitable (greater than 5 °C); otherwise charge the circuit.
The valve is connected incorrectly (rotates in re-
verse) and is open
Check the movement of the valve by placing it in manual control and closing or opening it com-
pletely. One complete opening must bring a decrease in the superheat and vice-versa. If the
movement is reversed, check the electrical connections.
Stator broken or connected incorrectly
Disconnect the stator from the valve and the cable and measure the resistance of the windings
using an ordinary tester. The resistance of both should be around 36 ohms. Otherwise replace
the stator. Finally, check the electrical connections of the cable to the driver (see paragraph 5.1).
Valve stuck closed
Use manual control after start-up to completely open the valve. If the superheat remains high,
check the electrical connections and/or replace the valve.
The unit switches off due
to low pressure during
control (only for self-con-
tained units)
LOP protection disabled
Set a LOP integration time greater than 0 s.
LOP protection ineffective
Make sure that the LOP protection threshold is at the required saturated evaporation temperature
(between the rated evaporation temperature of the unit and the corresponding temperature at
the calibration of the low pressure switch) and decrease the value of the LOP integration time.
Solenoid blocked
Check that the solenoid opens correctly, check the electrical connections and the operation of
the control relay.
Insufficient refrigerant
Check that there are no bubbles of air in the liquid indicator upstream of the expansion valve.
Check that the subcooling is suitable (greater than 5 °C); otherwise charge the circuit.
The valve is significantly undersized
Replace the valve with a larger equivalent.
Stator broken
Enable the manual positioning and check the opening and closure of the valve.
Valve stuck closed
Use manual control after start-up to completely open the valve. If the superheat remains high,
replace the valve body.
The cabinet does not
reach the set tempera-
ture, despite the value
being opened to the ma-
ximum (for multiplexed
cabinets only)
Solenoid blocked
Check that the solenoid opens correctly, check the electrical connections and the operation of the relay.
Insufficient refrigerant
Check that there are no bubbles of air in the liquid indicator upstream of the expansion valve.
Check that the subcooling is suitable (greater than 5 °C); otherwise charge the circuit.
The valve is significantly undersized
Replace the valve with a larger equivalent.
Stator broken
Enable the manual positioning and check the opening and closure of the valve.
Valve stuck closed
Use manual control after start-up to completely open the valve. If the superheat remains high,
replace the valve body.
The cabinet does not
reach the set temperatu-
re, and the position of the
valve is always 0 (for mul-
tiplexed cabinets only)
The driver in RS485 network does not start control
and the valve remains closed
Check the network connections. Check that the pCO application connected to the driver (where fe-
atured) correctly manages the driver start signal. Check that the driver is NOT in stand-alone mode.
The driver in stand-alone configuration does not
start control and the valve remains closed
Check the connection of the digital input. Check that when the control signal is sent that the
input is closed correctly. Check that the driver is in stand-alone mode.
Tab. 10.a