ZOLL E Series Monitor Defibrillator Rev D - Manual (Page 106)

Logic Control Signal Operation
E Series Service Manual
4-10 9650-1450-01 Rev. D
Internal Discharge Resistor Module
The Internal Discharge Resistor Module contains the internal discharge resistor, and a means for dissipating the heat generated by the internal discharge.
AC/DC Charger Module
The AC/DC Power/Battery Charger provides a universal (IEC 320) connection to the AC mains or to a DC source, input line filtering and double-pole
fusing (for a mains input), AC-DC and DC-DC conversion and isolation barrier between the E Series and power sources. This module also provides the
power necessary to run the E Series in any mode of operation, as well as providing additional charging current to the battery. When the E Series is turned
off but connected to an external AC or DC source, the charger module controls battery charging currents and voltages needed to charge the E Series
battery. These voltages and currents are controlled in response to the main CPU signals that manage the battery charging process.
XPWR_ENABLE This logic signal from the gate array enables the charging circuit when true, and inhibits the charging circuit when false.
SAFE This logic control signal is generated by the Main System Board to halt the pace/defib function in the event of a detected fault.
SHUTDOWN This logic signal is true during reset and fault conditions. (VCC error, watchdog error, etc.) and halts operation of the PD
generator.
XPACE_ON This logic signal is generated by an optocoupler, and indicates that the pace output circuit is active. It is '0' true when pace
current is flowing.
XSAFREL Logic signal from the GA that operates the safety relay when '0' true.
XPACEREL Logic signal from the GA that operates the pace relay when '0' true. XPATREL: Logic signal from the GA that operates the solid
state patient relay when '0' true.
XPAT_ENABLE Logic signal from the processor controlled by the monitor that grants operation of the solid state patient relay. It is false during
pacing.
XPACE_SEL Hardware only signal from the front panel switch that is at '0' during pace. Used as an additional safety interlock on the solid
state patient relay so that operation of the relay during pacing is additionally disabled.