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- the pack exhibits visible damage
- the pack does not operate any longer
- the pack was stored under unfavourable conditions for a long period of time or
- the pack was exposed to extraordinary stress caused by transport
Connection, putting into operation, maintenance,
exchange of fuses
A How to connect and put into service power packs
Connect the connection cable of non-heating apparatus to the power pack, when switched off. Subse-
quently, connect the mains plug to a protective contact socket (230 V A.C. voltage network). Switch the
power pack on by turning the ON/OFF switch to "ON" (I). An output voltage will then be displayed, depen-
ding on the position of the potentiometer ("Voltage" setting knob).
B How to connect loads
When connecting a load make sure it is switched off before joining it to the power supply unit.
The output voltage is infinitely variable from 0.0 V D.C. (D.C. = "direct current voltage") to 36 V D.C. (up to
37.5 V D.C. when non-heating). This should cover most applications. Note that the maximum power input of
the respective load connected may not exceed the maximums below, depending on their designs: 10 A for
3610 or 20 A for 3620 or 35 A.
Attention:
-
The surface of the casing will heat up intensely during prolonged operation at a rated
load (abt. 360 to 1,260 VA, depending on the design). Attention: Danger of burns ! The-
refore, take great care to sufficiently ventilate the power pack. Never operate it when
partially or fully covered. This will help avoid any damage.
-
When connecting a load always take care not to connect it as long as it is switched
on. A load in an ON condition, when being connected to the output terminals of the
power pack, can cause sparks to form on the supply terminals. This, in turn, can
damage the supply jacks or the cables connected and/or their terminals.
-
If you do not need your power pack disconnect it from the mains.
C How to set the output voltage (voltage limit)
Proceed as follows to set the output voltage:
1.Make sure the "OUTPUT" switch is on "OFF" and no load is connected and the setting knobs for the out-
put current (COARSE and FINE) are at their right-hand stops.
2.Switch the power pack on by turning the mains switch to "ON" (I).
3.Set the desired output voltage, which can be read from the left-hand digital read-out device, by turning
the "VOLTAGE" setting knob in a clockwise sense.
4.Actuate the "OUTPUT" switch.
5.The voltage set is applied to the output jacks ("+" = red and "-" = blue). The power pack will now be run-
ning in a constant-voltage mode "CV" (=Constant Voltage). At this point, the left-hand (green) light-emit-
ting diode will go on.
D How to set the output voltage (current limit)
Proceed as follows to set the current limit:
1.Make sure the "OUTPUT" switch is on "OFF" (is not depressed) and no load is connected.
2.Switch the power pack on by turning the mains switch to "ON" (I).
3.Actuate the "PRESET" switch. The current display will be switched over to displaying the current limit set
(output current). Set the desired output current coarsely by turning the "COARSE" setting knob in a clock-
wise sense and more precisely (finely) by turning the "FINE" setting knob in a clockwise sense.
4.Actuate the "OUTPUT" switch.
5.The current display will run back to 0.0 A. If the current limit set is exceeded (current limit) the voltage will
be regulated down. Then, the power pack will be in the constant-current mode "CC" (= Constant Cur-
rent"). At this point, the right-hand (red) light-emitting diode will go on.
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Attention:
• The "OUTPUT" switch may no longer be actuated under certain load conditions. Tho-
se are a load current ≥ 3 A for 3610, ≥ 6 A for 3620, and ≥ 8 A for 3635. If the switch is
actuated under a load when currents are higher than specified the power pack might
possibly be damaged/destroyed.
• If the temperature sensor has responded (with the yellow "TEMP" LED lit) you should
switch the power pack off. Disconnect the load connected from the power pack and
allow it to cool down for at least 10 minutes. Switch it on again with no load after this
period of time.
E How to connect in series (identical power packs) = Voltage addition or multiplication
If higher output voltages are needed, e.g. to operate a MOSFET output stage, we recommend that you
should connect in series power packs of the same type (two or more 3610 or two or more 3620, etc.). Use
the same type to prevent any undesirable side effects such as balancing currents, overshoots or thermal
problems, etc. Proceed as follows to connect in series identical power packs:
1.Place the power packs, when switched off, next to or on top of each other, keeping the connection cables
as short as possible (with cross-sections of more than abt. 6 sq.mm).
2.Now, connect the positive pole "+" (red) of one power pack to the negative pole "-" (blue) of the other
power pack.
3.Then, set the same output current on the switched-on power packs (balancing currents will otherwise
occur).
4.The output voltage can now vary between 0 V and X V where "X" is to be the number of interconnected
power packs. The sum of output voltages is now applied to the remaining two jacks "+" (red) and "-"
(blue).
Attention:
Under adverse circumstances, there is a danger to life in case of contact with live cables,
circuits, circuit components, etc., starting from a voltage of 35 V D.C.
F How to connect in parallel (identical power packs) = Current addition or multiplication
If higher output currents are needed, e.g. to operate direct-current machines (using rated currents of more
than 10 A, 20 A or 35 A), we recommend that you should connect in parallel power packs of the same type
(two or more 3610 or two or more 3620, etc.). Proceed as follows to connect in parallel identical power
packs:
1.Place the power packs next to or on top of each other, keeping the connection cables as short as possi-
ble. Use connection cables with cross-sections which are as large as possible (e.g. 10 sq.mm).
2.Connect the positive pole "+" (red) of one power pack to the positive pole "+" (red) of the other power
pack.
3.Similarly, connect the negative pole "-" (blue) of one power pack to the negative pole "-" (blue) of the other
power pack.
4.Set the same output voltage on the power packs (non-balance will otherwise occur).
5.The output current can now vary between 0 A and X A where "X" is to be the number of parallel-connec-
ted power packs.
G How to do maintenance
The power supply unit does not require maintenance except that the surface of its casing, the displays and
setting knobs, and the output jacks need cleaning occasionally. However, check the mains plug for the inte-
grity of its insulation at certain intervals. If fuses require an exchange do not fail to note the safety instruc-
tions and the text that follows, for your own safety.
Do not open the device or make unauthorized modifications to the circuits inside the device because this
will invalidate the guarantee claim. Use a clean, non-fluffy, antistatic, and dry cloth to clear the device of
impurities.
Attention:
Do not use carbon-containing cleaning agents, petrol, alcohols or similar agents. This
can attack the surface of the device. Furthermore, the fumes are a hazardous to health
and are explosive. Moreover, you should not use sharp-edged tools, screw-drivers or
metallic brushes or similar objects for cleaning.
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