Betriebsanleitung_HF3_14_de - 第600页
13 2KE0041502 - englisch_BA 04.1 1.2010 ENGLISH Float switch The float switch monitors the water level in the tank. A signal lamp in the control cabinet door indicates lack of water when the water level falls below the m…
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2.4 Safety Devices
The process cooler is equipped with the following safety devices:
High-pressure control (HP)
The high-pressure control is designed to protect the process cooler against extremely high
operating pressure in the refrigeration cycle.
In the event of a malfunction, the HP control switches the process cooler off, and the
malfunction is indicated on the control panel.
The process cooler cannot be restarted until the pressure has dropped to the preset pressure
difference and the Reset button on the pressostat has been pressed.
The high-pressure pressostat can be accessed from the service side.
2.5 Monitoring Devices
Low-pressure control (LP)
The low-pressure control protects the process cooler against extremely low operating pressure
in the refrigeration cycle.
In the event of a malfunction, the control switches off the process cooler, and the malfunction
is indicated on the control panel.
Restarting of the process cooler is effected automatically as soon as the pressure has risen
by the preset pressure difference.
Winter starting aid
The winter starting aid is designed to prevent any low pressure malfunctions in low ambient
temperatures during the start-up phase of the cooling operation until normal operating
conditions have been established.
Compressor overheat protection
The compressor is equipped with an overheat protection (thermal contact, Klixon). In the event
of an increase in motor current in conjunction with a rise in winding temperature, the overheat
protection trips, and the compressor is switched off. The overheat protection resets itself
automatically after the windings have cooled down. The malfunction is indicated on the control
panel.
Thermal contact – fan motor
In the event of an increase in motor current in conjunction with an increase in winding
temperature, cooling operation is switched off by the thermal contact.
This malfunction is indicated on the control panel.
Circuit breakers (compressor, fan, pump)
In the event of an increase in motor current or in the case of short circuits, the circuit breaker
trips and interrupts the power supply.
Such malfunctions are indicated on the control panel.
The circuit breakers are located in the control cabinet.
2. Description of the Process Cooler
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Float switch
The float switch monitors the water level in the tank.
A signal lamp in the control cabinet door indicates lack of water when the water level falls
below the minimum level. The cooling operation remains activated.
If the water level continues to fall and once the minimum limit value is reached, cooling
operation and pump(s) will be switched off.
Restarting the process cooler is not possible until the water has been replenished up to the
MAX mark at the filling level indicator.
The float switch is located in the tank.
Fan control
The condensation pressure is controlled by cycling the individual fans on and off.
This type of control permits an adaptation to different operating conditions at relatively constant
condensation temperatures.
Control and Operating Unit
The control and operating unit controls the water circuits and the refrigeration circuit.
The control panel with display of the water temperatures, as well as the error codes in the case
of a general fault alarm, is integrated in the control cabinet door.
2.6 Electrical / Control Equipment
The electro-technical equipment of the process cooler is installed in the control cabinet. All
required components for the automatic switching, controlling and regulating operation are
contained in the control cabinet.
The main electric circuits are of a non-fused design featuring motor protecting switches.
The connection of the process cooler to the equipment to be cooled is effected via a potential-
free interface.
The interface transmits the following signals:
- „ Malfunction ’’ Continuous signal from the process cooler to the equipment to be cooled.
The water outlet temperature is kept constant by the control and operating unit at a given
setpoint value by activation of power stages in the refrigeration cycle. The current water outlet
temperature is displayed on the control panel.
2. Description of the Process Cooler
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3. TRANSPORT AND STORAGE
The safety notices contained in Chapter 1 must be complied with !
As a rule, the process cooler must be transported in upright position without water
charge !
The in-house transport is carried out by a forklift, lift truck or crane.
This process cooler must be placed on a level surface in order to prevent any distortion of the
base-frame.
3.1 Transport Specification
- Weight
- Main dimensions
- Ambient temperatures –20°C to +60°C
In ambient temperatures <0°C the water circuits must be completely drained, including pumps,
water filters and tanks.
(See Chapter Decommissioning)
3.2 Transport Using a Forklift
To transport the process cooler with a forklift, the recesses provided at the broadside of the
base-frame of the unit should exclusively be used. Do not lift the unit until the forks have been
inserted horizontally all the way beneath the unit, symmetrically to the centre of gravity of the
process cooler.
The lifting rate should be kept to a minimum!
3. Transport and Storage