Technical Manual Cold Storage Controller EVP 3150-1 and EVP 3150-2
Page 14
leading controller unit
(master)
guided controller unit
(slave)
guided controller unit
(slave)
control sensor
defrost termina
-
tion sensor
cooling lock
external defrost
cooling release
external defrost
cooling release
cooling
relay
defrost
relay
cooling
relay
cooling
relay
defrost
1
defrost
1
defrost
1
defrost
1
solenoid valve
or
compressor
solenoid valve
or
compressor
solenoid valve
or
compressor
defrost
heater
defrost
heater
defrost
heater
optional
optional
RS-485 databus
defrost termina
-
tion sensor
Roller Blind Control
To enable the EVP to control roller blinds automati-
cally, it is necessary to assign the function "
roL
" to a
relay output. The roller blind control is coupled to the
day/night-mode, so the blind will be closed in night-
mode. Defrosting overrides this function and opens
the roller blind during a defrost period.
Internal control:
No digital input has got the functions "
dnL
"
or "
dnh
", but if yet, the input must be set to day-
mode. The switch times "
P21
" (night operat.
ON) and "
P22
" (night operat. OFF, Mode Page)
must be programmed.
Day-Mode: Roller blind relay is de-activated,
so the motor will turn the blind to the 'open'-
position via the relay's N/C contact.
Night -Mode: Roller blind relay will be activated
to close the blind via the N/O contact of the relay.
External control
A digital input has got the function "
dnL
" or
"
dnh
". Switch times "
P21
" and "
P22
" (night
operation on/off) must be set to "
oFF
".
If the digital input is activated, the relay switches on
and closes the roller blind. After de-activating the
digital input, the relay switches off and opens the
roller blind via its N/C-contact.
Frame Heater control
Frame heaters are used to avoid a door freezing onto
the door frame. In addition it prevents condensing
water around the door or on top of the frames of
open chest freezers.
Power Optimization
To optimize the power requirement of the connected
heaters, the controller is able to adapt the pulse ratio
(within a specific range) to the current humidity of the
ambient air (market temperature). The information
about current market temperature and humidity
the controller gets from a superior system (VPR
5240, can also be disabled ther) to calculate the
absolute humidty.
If one of the relays is assigned to "
FrA
", this will control
the frame heater energy with a certain frequency and
pulse-width. For day and night operation you can
choose different values to save energy. The corres-
ponding parameters on Mode Page are:
To control multiple evaporators, any number of
EVP-units can be added. The units transmit their
information via the cooling/defrost relay(s) and the
digital inputs with the functions 'cooling lock' and
'forced cooling'.
Each digital input can be assigned to this functions:
rLL
(cooling lock, active low):
Cooling function of the unit is disabled if
no voltage is present at the digital input
rLH
(cooling lock, active high):
Cooling function of the unit is disabled if
the digital input is connected to mains phase
Principle of cascading:
The leading EVP-unit releases the cooling function of the 'slaves' via their input "cooling release". The 'slave' units lock the cooling function of the master unit
via its input 'cooling lock', as long as a defrost cycle works.
Cascading controller units to extend cold storages
rFL
(cooling release, active low):
Cooling function of the unit is released if
no voltage is present at the digital input
rFH
(cooling release, active high):
Cooling function of the unit is released if the
digital input is connected to mains phase
M
L N
roller blind relay
close
open
ext. contact
"dnh" = day mode if contact is closed "dnl" = day mode if contact is open
frame period P11
frame
pulse
ON
OFF
heater switches off
heater switches on
• "
P11
"
defines the duration of the cycle,
• "
P12
" defines the percentage of heating
during day operation within each cycle.
100% = continuous heating, 0% = off
• "
P13
" defines the percentage of heating
during night operation within each cycle.
100% = continuous heating, 0% = off
• "
P14
" shows the current active ON-time of the
heating, which may varied by a VPR
host system.
Limit values
- Temperature: 19-24°C
- Air Humidity: 40-70% r.H.
At the upper limit, the pulse ratio is equivalent to
the value set by P11...P13. At the lower limit, the
ON-time decreases by the half value.
