Vacuum machine 1/4 hp

Label 150 microns
2 cfm
Practice :
Evacuation of mixture inside pipe
Manifold used for measures
Desired pressure at - 30 psi / -30 deg C
Compressor unit : 1 hp / 736 W
Pipe : 1/4 "
Time during vacuum process : depend on pipe length.
If 3 m of length, g/m2 = 0.3 kg/cm2.
If refrigerant R22 flow 0.1 g/s through pipe.
1 psi equals 0.07 kg / cm2, vacuum time 4 seconds.
Evaporator pipe : +/- 10 m, vacuum time 40 seconds ---- kg sec / cm2
If 150 micron = 0.015 cm = +/- 4 seconds
If 2 cfm, used for < 2 pk

BTS power tranceiver and receiver

Wireless Radio in remote area like broadband connection after examining of signal weakening : power is from PLTU in the city.
UPS and battery should be available. IP address gateway IP DHCP (DNS 0000) remote connection sets for wireless radio after online registration.

When the router is active, it must be connected to electrical outlet. Consequently the router can not send and receive any data connection during communication. It sometime indicates on the host display some messages about failure connection.

UPS can be installed to the router in order to give much time for the router preparation during shutting down. If suddenly lost power, the router voltage regulator may be damage because of nuisance voltage during sending and receiving data communication.

The router specification is written down on label : 220 V , 70 mA / 50 Hz. IEC acronym can be identified on label, giving information about equipped with grounding system.

Electronic Connection

Router broadband network :
Wireless infrastructure is devided into server 64 byte ( fast communication), utp. In internet connection menu, setting is through this computer as gateway server.

Lan topograhy : from server to radio wireless nework using utp (fiber optice) and power supply. This radio mac address should be registered to the network by connecting to internet connection and type its mac address. If registered, the ip address is automatically detected. After registering, this radio can be an access point for internet connection.

UPS power should be used for good power factor supplying to the radio. In ISP big power supply (UPS) were used with 12 V/100 AH as charging ups battery when no electric supply.

If in wireless network (internet service provider), it uses wireless broadband  server. Yagi antenna model connects to a/d to d/a rack and connected to server. The wlan connection is used wireless radio like in adsl connection.

UPS dipakai sebagai sumber daya listrik

Kamera cctv dipasang dengan UPS sebagai sumber listrik. Begitupula pemasangan UPS pada komputer dan peralatan utama seperti :
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• Cctv : infrastructure
• Vcr / Dvr, Monitor, 12 V power and video cables (coaxial cable), analog camera (Analog).
• Cable LAN (multiplexer), internet connection (wireless router), spliter, computer intel 64 byte, ip camera (Digital).

• Analog image - coaxial cables (capacitor bulb) - DVR - Monitor.

Penggunaan sinyal analog dari kamera dihubungkan langsung ke perangkat perekaman gambar untuk diubah ke sinyal digital dan ditampilkan pada layar monitor. Penggunaan multiplekser analog ke digital dan sebaliknya dimaksudkan untuk perekaman dan tampilan pada layar monitor. Mengapa power supply sering mengalami kerusakan ? Penurunan tegangan dari 220 V ke 12 Vdc dengan arus hubung singkat 200 mA digunakan tanpa UPS.

(Analog image converter changes to digital image (by poe multiplexer). Multi switch connects digital image. Send to dvr and television without program. From DVR connects to internet connection (IP network). Digital Camera - router - computer server to wireless network (wlan). Handbook is available).

Uncompleted design can be inefficiency

Freezer room has two main parts : indoor units and outdoor units. Indoor units are consisted of evaporator and its control like expansion valve, heater, ntc bulb sensor to monitor its cooling temperature insode room. And outdoor units are consisted of compressor machine, condenser ( oil separator, heat exchanger for big system), and its control like electric panel with digital controller, ntc bulb for temperature control of outside air, filter, sight glass, solenoid valve, danfoss pressure controller, oil pressure sensor.

Freezer room machine can be set its cooling temperature desired. Pressure controller can be used to detect differential pressure of high pressure and low pressure at the compressor. If non stop operation is desired, timer set on and pressure control such a kp danfoss to limit defrost time during half hour and starting again while evaporator fans still operate.

Problem : y=f(x)
Dy/dx= P per t
Di/dt = I^2.per t
y=I^2 e ^-t/L/r
Start : Pinductive = I^2 max.0.36
P=Limit t=0.36 integral I^2 t dx,
P varies if time constant changes
P >P out
P=P if time constant 1
P < P out x 1.25
Heater works to increase refrigerant pressure mixed to  compressor. So, that refrigerant makes good start-up.

Continuous operation may cause lack of refrigerant. Kp pressure does not work when applying little liquid of refrigerant.  At high ambient temperature with heater and fan continuously running: P <P out inductive. The Impact is heater burnt out because magnetic field is high when all units are operating without setting up the defrost time.

Comparing to the system with electric device protection used defrost time,
30 to 45 minutes defrost time with only evaporator fan and heater work. It always P > Pout. Sensor kp danfos will detect pressure, so the ntc bulb detects temperature while heater energizes heat during physical conversion of refrigerant.