GENERAL
SM6000
9 / 21
DELTA ELEKTRONIKA B.V.
rev. Nov. 2020
3.16
FUNCTION SWITCHES ON SW1
In the table on the previous page the functions of the DIP
switches 1-5 of switch SW1 at the rear side are explained.
3.17
REMOTE SHUTDOWN (RSD)
A voltage of +4...+12 V on the RSD input on the programming
connector CON E will switch off the output of the unit.
It is also possible to use a relay contact or a switch to shut the
unit down (see fig. 3 - 11). In standby mode the power supply
consumes very little power.
3.18
INTERLOCK
The Interlock connector CON A has 2 pins (1 & 3) which have
to be connected together to enable the unit, see fig. 3 - 12.
As soon this connection is interrupted, the DC output of the
unit shuts down. It can be used in combination with door
contacts (safety precaution) or as an emergency stop.
In case the connection is interrupted the RSD LED will light.
In contrast with Remote ShutDown, also the DCF LED will be
on, DCF status will be high and the relay contact will change.
Once the inputs are reconnected, the DC output will be on
again.
The interlock circuit is at the same level as the analog ground,
the S- and the minus DC power terminal. The interlock circuit
needs voltage free contacts and can not be connected in
parallel or series with other interlocks .
3.19
PROGRAMMING SPEED
The rise and fall time is measured with a step waveform at the
CV prog. input. Programming from a low to a high output
voltage is nearly load independent, but programming down to
a low voltage takes more time on lighter loads. This is caused
by the output capacitors, which can only be discharged by the
load because the power supply cannot sink current. With the
Power Sink option, also the programming down speed is
nearly load independent.
When having a unit with a hi speed programming option, the
rise and fall time is 5 to 25 times faster (see datasheet). The
programming source must be floating or otherwise an ISO
AMP CARD must be used, a non-floating source will result in
slope distortion.
When using hi speed programming it is generally not
recommended to use remote sensing or serial / parallel
operation. Consult factory for advice. Note that the output
ripple is higher.
3.20
PULSATING LOAD
To avoid overheating the DC output capacitors, the AC
component of the load current should be limited (fig. 3 - 13).
One method of decreasing the AC current through the output
capacitor is by using a large external electrolytic capacitor in
parallel with the load. Care must be taken so that the
capacitor in combination with the lead inductance will not form
a series resonant circuit!
When using remote sensing on a pulsating load (for instance
a DC-motor), use a capacitor in series with a resistor over the
load (see fig. 3 - 14). Like this the AC-component caused by
the pulsating of the load is filtered.
Note: in case of a pulsating load, the I monitor voltage will not
exactly match the output current. This is mainly caused by the
current through the output capacitors. Remote sensing will
worsen this effect.
3.21
INSULATION
For safety the insulation of the separating components
(transformers) between mains in and DC output is tested at
3750 Vrms during 1 minute. This is tested before assembly.
Warning! The 3750 Vrms cannot be tested afterwards on the
assembled unit because the insulation between the
components on the AC side to the case (like the bridge
rectifier) is specified at 2500 Vrms. Since the insulation of DC
power terminals -> case is 600 VDC, the insulation of the
primary components to case will break down when 3750 Vrms
fig 3 - 11
Remote Shut Down using a relay contact.
fig 3 - 12
Interlock connection at CON A. Connect between pin
1 and pin 3, do not use pin 2.
fig 3 - 13
Pulsating load current.
fig 3 - 14
Remote sensing on a pulsating load.
fig 3 - 15
Insulation test voltages.
