ST.-BY.-PUMP AND COMPRESSOR CONTROL SERIES AHD 408
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ST.-BY.-PUMP AND COMPRESSOR CONTROL SERIES AHD 408 AHD 408 E - Microprocessor-controlled device for control desk mounting. - Controls two independent pairs of electrical pumps. - Selector switch for main- and st.-by-pumps is installed at the front-side. - After switching on, the st.-by-pump builds up the pressure, then the system switches over to the main pump. - In case of a pressure drop, the st.-by-pump starts automatically; this causes an alarm. - In case of a blackout, all pumps are stopped. After restoration of power, they only start after a pre-programmed time. - Pressure and condition of the pumps, as well as blackout and st.-by-alarm are indicated. - Text field can be exchanged easily. AHD 408 A - Microprocessor-controlled device for control desk mounting. - Mainly used for lubrification and gear oil, where the main pumps are driven directly by the diesel engine. - Controls the st.-by-pumps depending on the oil pressure and the speed of the diesel engine. - St.-by-pumps are switched on at low speed of the engine (normal), as well as at high speed of the engine and falling pressure (not normal, st.-by-alarm). - Text field can be exchanged easily. AHD 408 E-K - Microprocessor-controlled device for control desk mounting. - Upper half of device is for one pair of st.-by-pumps (compare AHD 408E) - Lower half is for one pair of compressors and operates as follows: - Switches main- and st.-by-compressor depending on on the air pressure. - If the running time of the main- and st.-by compressor exceeds the pre-programmed time, a st.-by-alarm is released. - A selector switch for main- and st.-by-compressor is installed at the front-side. - In case of a blackout, both compressors are stopped. After restoration of power, they only start after a pre-programmed time. - Text field can be exchanged easily. Development, manufacturing, service for shipping and industry Am Steenö ver 4 • D-27777 Ganderkesee • Phone: + 49(0)4221 9475-0 • Fax: + 49(0)4221 9475-21 /-22 internet: www.boening.com • mail: info@boeni

St.-by-Pump- and Compressor Control Series AHD 408 General information about all types of devices AHD 408E, st.-by-pump control for 2 electrical pairs of pumps Function Remote control of the pumps System failure Terminal diagram Programming Technical data Text field St.-by-pump-control AHD 408E with remote control Dimensional drawing AHD 408A, st.-by-pump control for attached main pumps Function Terminal diagram Programming Technical data Text field Dimensional drawing AHD 408AE, as AHD 408 A, but with addressing of a prelubrification pump and switching-off of unimportant consumers Function...

1. General remarks for all types of devices AHD 408-systems are microprocessor-controlled devices for control desk mounting. They are plug-in units which consist of two electronic cards in a sandwich-construction and the front panel. It is accommodated in a housing according to DIN 43700. The front dimensions are 72 mm x 144 mm and the installation depth is 216 mm. All in- and outputs are led to a 24-pole terminal block, which is located on the rear side of the housing. The inputs are separated from the rest of the electronics by optocouplers. There are floating relay contacts available for...

In case of a power failure of the pumps during operation (blackout), the relays of the st.-bypump-control switch into a position which at first avoids the start-up of the pumps after restoration of power. Only after elapsing of a programmable time (t3) the pumps are connected. Thus, an overload of the board power system is avoided. For development of pressure the time t1 is available again. In case of power failure of the electronics or breakdown of the device, all relays switch into resting position. If the pump-control is activated, the main pumps switch. Most likely, they were already in...

- After switching on of the power supply, the relay switches collective alarm. collect. alarm collect. alarm repetition - In the status displayed here, the device is without power. All pressures are lower than the point of reaction of the pressure switches. K1 to K5, 250VAC/3A collective alarm repetition and collective alarm relay 48VDC/AC/1A - permissible load of relay contacts The EEprom (Type 28C64) is located on the upper card of the plug-in unit. If it has to be reprogrammed, the plug-in unit has to be torn out after loosening the screw in the front panel. Upper part of device t1...

collect. alarm - After switching on of the power supply, the relay switches collective alarm. collect. alarm repetition - In the status displayed here, the device is without power. All pressures are lower than the point of reaction of the pressure switches. K1 to K5, 250VAC/3A collective alarm repetition and collective alarm relay 48VDC/AC/1A - permissible load of relay contacts St.-By Pump Control AHD 408E with Remote Control serial data Dimensional drawing PS 47-1-08 Example 2 x Klö ckner Mö ller Art. no. 907788 0 switch position Example Klö ckner Mö ller Art. no. 907789 Pos 1: Pump I =...

3. AHD 408A, St.-by-pump-control for attached main pumps 3.1 Function AHD 408A contains two controls for each st.-by-pump, which work independently of each other. The main pumps are driven by the ship’ main engine. s The following three states have to be distinguished: - If the st.-by-pump-control is switched off, the relay to address the auxiliary contactor has dropped (contact open). Pressure- and speed-switch have no influence. If the st.-by-pump-control is switched on and the engine is in resting position or operating at low speed, the st.-by-pump is switched on. This state is normal,...

- Permissible load of relay contacts K1 and K6, 250VAC/3A collective alarm repetition and collective alarm relay 48VDC/AC/1A - In the displayed status, the device is voltageless. All pressures are lower than the point of reaction of the pressure switches. - After switching on the power supply, the collective alarm relay closes. Coll. alarm Coll. alarm repetition Monitoring of rotation speed switch n1 The EEprom (Type 28C64) is located on the upper card of the plug-in unit. If it has to be reprogrammed, it has to be torn out after loosening of the screw in the front panel. Upper half of...