Technical data

Technical Manual Cold Storage Controllers TKP / TKC x130 - x140 Page 21
Adding controller units to extend cold storages
If one controller unit has not enough ressources to control a cold storage,
you can add one or more units. The necessary communication is made
by the digital inputs.
Each of the digital inputs can be assigned to the following jobs:
Refrigeration Lock (avtive low) : The refrigeration function of the
controller unit will be stopped as long
as 0Vare connected to the control
input.
Refrigeration Lock (avtive high) : The refrigeration function of the
controller unit will be stopped as long
as mains voltage is connected to the
digital input.
Forced Refrigeration (active low) :
The refrigeration function of the controller unit
will be forced as long as 0Vare connected to
the digital input.
Forced Refrigeration (active high) :
The refrigeration function of the controller unit
will be forced as long as mains voltage is
connected to the digital input.
Principle of adding controller units:
optional
optional
lim
itation-
sensor
led controller unit
(slave)
led controller unit
(slave)
forced refrigeration
external defrost
refroferation-
rela
y
defrost
1
defrost
1
defrost
1
defrost
1
refri
g
eration-
rela
y
solenoid-
valve
or
com
p
ressor
solenoid-
valve
or
com
p
ressor
solenoid-
valve
or
com
p
ressor
defrost-
heater
defrost-
heater
defrost-
heater
RS-485-data connection
leading controller unit
(master)
refri
g
eration-
rela
y
refrigeration
lock
control-
sensor
lim
itation-
sensor
defrost-
rela
y
forced refrigeration external defrost
The leading unit engages the cooling function of the 'slave'-units via their digital input 'Forced Refrigeration'. The 'slave'-units disable the cooling
function at the 'master'-unit via its digital input 'Refrigeration Lock', as long as a defrost function works.