Power Supply - DCA Intertel 2000 Technical Manual

2.4 Power Supply

The MP 2000 should be powered by a direct current source whose voltage falls strictly
within the following range : +10.8 to + 14.0 Vdc.
Owing to the print head's needle firing, it is important to consider that the printer, acts
as a very discontinuous loads with I max. abs = 30A for 600 µs, and I max. typ = 20
A for 300 µs: peak repetition frequency is 900 Hz.
The power supply should therefore be able to deliver high peak currents without
overshooting the absolute Vmax. The ripple value should always remain within the
input voltage's operating limits. The specification of the supply should be particularly
checked for the application whenever a switching power supply (SPS) is used, general-
ly these exhibit a longer recovery time than their linear counterparts.
Any overvoltage or undervoltage, even for a short duration, can cause respectively
electronic circuit damage or microprocessor malfunction and should therefore be avoi-
ded. The same applies for electrostatic charges exceeding 5kV applied to the printer's
frame.
The MP 2000 has been particularly developed for portable and battery operated sys-
tems; in the latter application, the following points should be noted:
• When the supply's voltage is under the low threshold of 11.5V (batteries nearly drai-
ned) the "POWER ON" indicator flashes. This function can be disactivated by means of
the ESC #C n control (see 4.2.7.)
• When the voltage drops below 10.5 V (batteries drained) the printer stops working
while the Error indicator intermittently and the "POWER ON" indicator flashes. To reset
this error condition you need to switch the printer off, recharge the battery pack and
then switch the printer on again.
DCA Intertel 12 DCA Intertel