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BAX 5675
WÄRTSILÄ JOVYREC PME
6.3 Reliable electrical disconnection
Assuming the device and modules are designed appropriately and that the cables for the mains and output
circuits are laid separately, the devices with an output voltage of up to 60V DC ensure protection against
dangerous body currents as a result of functional low voltages with reliable electrical disconnection as per
EN60950 while devices with output voltages of over 60V DC ensure reliable electrical disconnection up to
324V output voltage as per EN60950.
6.4 Input
Every PME has a two-pin safety fuse in its AC input. The safety fuses are only accessible within the device
and must also not be replaced by the end user. The inrush current is limited to max. 16A by means of series
resistance.
6.5 Output
The output is protected against overload, short-circuiting and reverse polarity by a relay. The out-put
characteristic curve setting is defined at the analog interface to the PME by a potentiometer.
The preselection of the characteristic curves is performed externally via a 14-pin plug-in connection (see
circuit diagram A4 – LP – 0012 -1)
The U/I characteristic curves are split into two/three sections with reference values as follows (the connections
between the reference values are linear):
Type 11 :
72V with 25A, 65V with 38A and 46V with 54A
Type 21 :
160V with 12,5A and 108V with 23A
Type 31 :
324V with 6,2A and 216V mit 11,5A
Dynamics of output voltage
A load increase of 40 percent within the load range of 20 – 80% with a current rate of 2A/us has the following
impact.
Type 11 :
Overshoot
< 0.7V
Undershoot <
0.7V
Recoverytime < 500uS
Type 21 :
Overshoot
< 1.4V
Undershoot <
1.4V
Recoverytime < 500uS
Type 31 :
Overshoot
< 2.8V
Undershoot <
2.8V
Recoverytime < 500uS
Radio interference suppression
The switching power supply fulfills limit class B as per EN55022 and FCC for conducted and radiated
emissions.
The output ripple is measured with Filter A as per CCITT for:
Type 11
à
< 2mV fpr 60V, < 2mV for 48V, <1mV for 24V
or as voltage value peak-to-peak
Type 11
à
<280mVpp for 24V up to 60V
Type 21
à
300mVpp
Type 31
à
600mVpp
6.6 Parallel
switching
Owing to the parallel switching capacity of the PMEs, it is possible to set up redundant systems as per the n+1
principle.
The load currents can be balanced at < 0.5A based on the characteristic curve tendencies (see be-low).
Characteristic curve tendencies :
Typ 11
à
100mV / 50A
Typ 21
à
200mV / 25A
Typ 31
à
400mV / 12.5A
