Tel: +41 43 311 4511
Fax: +41 43 311 4545
[email protected]
www.tracopower.com
Date: 24 May 2005
Issue: 1.2
Page
Seite
3
Jenatschstrasse 1
CH-8002 Zürich
English
1. Description and construction
The TSP-BFM24 Buffer Module will hold the output voltage of a 24VDC power supply after brown outs or voltage dips of up to
ten full 50Hz cycles. During this buffer period no deterioration of the 24VDC output voltage will occur. For many applications this
buffer module is an ideal and cost effective alternative to a battery based backup system. The buffer module consists of a large
bank of capacitors. When the power supply is switched on, the buffer capacitors will be charged. This will take approximately 30
second and an opto-coupler signal indicates the "READY" condition. When a power fail occurs, the capacitor bank is
discharged, maintaining the output of the buffer module at its nominal voltage. This condition is indicated by a "POWER FAIL"
signal. The hold up time is typically 200ms at 25A and 4 seconds typically at 1,2A. After 4 seconds the buffer device will switch
off the output voltage. The operation modes of the module are indicated by a LED on the front panel also. The big advantage of
this buffer solution is, that it is fully maintenance free and its storage capability does not deteriorate over the lifetime of the
product.
The TSP power supply has to be connected to the load as well as to the TSP-BFM24 module (see Fig. 1.1). The device is in
parallel to the output voltage of the TSP power supply, and charges its internal hold-up capacitors during normal operation. The
charge current (<0.6A) is taken from the power supply output itself (charging time 30 sec max.). The output voltage is monitored,
if it drops below an adjusted threshold the TSP-BFM will switch off. The stored energy in the hold-up capacitors is used to keep
the output voltage at the threshold level. The quiescent current is 100mA typ. (typ. 2.5W). The output voltage of the TSP power
supply has to be 1V higher as the threshold level adjusted by the potentiometer (see Fig. 3.1)
The threshold level can be adjusted on two different ways:
Option 1:
In the factory the TSP-BFM24 is charged and then discharged with no load, this gives the operator 4s approx. to set
the threshold level.
Option 2
: Less accurate. Turn the TSP-BFM24 Potentiometer fully clockwise and connect the TSP-BFM24 to a DC supply or
the TSP power supply unit set to 22.5V (for 24Vdc output voltage use) or to the level which the threshold level should
be set. Turn the Buffer Pot anti-clockwise until the charging LED starts flashing Green/Red
The TSP-BFM24 is a built-in unit. The mounting position has to fulfil the requirements for fireproof case according to UL60950,
IEC/EN 60950 or other appropriate national standard. The relevant UL regulations or equivalent national regulations must be
observed during installation.
The TSP-BFM24 is designed for mounting on a DIN rail TS35 (DIN EN 50022-35x15/7.5).
The TSP-BFM24 is not protected
against reverse input polarity.
Warning
The TSP-BFM24 is constructed in accordance with the safety requirements of IEC 60950, EN60950, UL60950 and UL508.
The TSP-BFM24 fulfils the requirements for CE-compatibility and carries the CE-mark and is UL & cUL approved by CSA.
The TSP-BFM24 built-in module is designed especially for use in process automation and other industrial applications.
Components with dangerously high voltage and high stored energy are located in the device. However, these are inaccessible.
Failure to properly maintain the TSP-BFM24 can result in death, severe personal injury or substantial property damage.
The
TSP-BFM24 may o
nly be installed and put into operation by qualified personnel.
The corresponding national
regulations (e.g. UL, ANSI, VDE, DIN) must be observed. The successful and safe operation of this module is dependent on
proper storage, handling, installation and operation.
The potentiometer to adjust the TSP-BFM24 threshold level is only allowed to be actuated using an insulated screwdriver,
because accidental contact may be made with parts inside the power supply carrying dangerous voltages.
Please observe following points before putting the device into operation:
•
Read operating instructions thoroughly.
•
That the installation has been carried out by a competent person and protection against electrical shock is guaranteed!
•
That the input wiring is sufficiently dimensioned!
•
That the output wiring is dimensioned according to the maximum output current or separately protected!
•
That the protective earth is connected.
•
Sufficient cooling is guaranteed!
•
The temperature of the housing can become very high, depending on the ambient temperature and load.
Caution:
Risk of electrical shock and electrical discharge. The TSP-BFM24 nor the power supply must not be opened until at least 5
minutes after complete disconnection of the mains and battery.
Electrostatic sensitive device.
Qualified and trained personnel only may open the TSP-BFM24 or the power supply.
Attention:
In case of non-observance or exceeding the mentioned limiting value of the data sheet, the function
and electrical safety can be impaired and can destroy the TSP-BFM24 and/or the power supply.
Danger:
Never work on the TSP-BFM24 or power supplies if power is applied!
Before installation ensure that the main switch is switched off and prevented from being
switched on again. In case of non-observance, touching of any live components or improper
dealing with this TSP-BFM24 or power supply can result in death or fatal injury.
