Specifications

20 RK0YG302 © Danfoss 05/2007
AK-PC 730
AK-PC 730
Additional information!
Manual: RS8EK
Ordering
Application
AK-PC 730 is particularly well-suited to capacity control of cascade
or booster systems.
By using two controllers, a complete capacity control of both
circuits is achieved.
Advantages
• Start-up coordination ensures optimum interaction between
the high pressure and low pressure circuits in cascade/booster
systems
• Start/stop signal for injection in cascade heat exchanger
• Optimisation of suction pressure from the refrigeration area that
is used most
• Optimisation of condenser in relation to ambient temperature
• Error detection of dirty condenser
• Flexible hardware platform with extension modules
• Fast set-up using pre-dened set-ups
Control
• Compressor capacity is controlled via the suction pressure P0, a
media temperature of S4 or an alternative control pressure Pctrl.
The reference can either be overide with a day/night signal or it
can be optimised automatically via the data communication.
• Fan capacity is controlled either via the condensing pressure Pc
or a media temperature S7 (dry cooler). The reference can be
optimised via ambient temperature measurement and changed
during heat recovery.
• The Ss and Sd sensors are used for monitoring of overheating of
suction pipe and pressure pipe temperature respectively.
Additional functions
• Control of up to 4 compressor steps
• Compressors of the same or dierent size
• Speed control of one or two compressors
• Equalising of operating time between compressors
• Anti-cycle timers for each compressor
• Up to 6 safety inputs per compressor
• Capacity limit of compressors via two digital inputs
• Step or speed control of up to 6 fans
• Monitoring of fans
• Coordination function between high-pressure and low-pressure
circuits
• Injection signal for cascade heat exchanger
• Monitoring of too low suction pressure P0 and of high condens-
ing pressure Pc
• 5 digital inputs for alarm monitoring
• 5 thermostats and pressure switches for monitoring/control
• 5 voltage inputs 0-10 V d.c. for signal monitoring
Type Function
Applica-
tion
Language Code no.
AK-PC 730 Capacity control
compres-
sor/con-
denser/
both
English,
German,
French, Italian,
Dutch
080Z0116
English (UK),
Spanish,
Portuguese,
English (US)
080Z0117
English (UK),
Danish,
Swedish,
Finnish
080Z0118