SECTION 4 THEORY OF OPERATION
430-00587-008 (Rev. 2/05)
4 - 2
Plum XL Series
Note:
Do not connect DataPort when infusing.
Note:
Nurse call alarm is not available in IEC compliant infuser.
This section describes the function and electronic circuitry of each printed wiring assembly
(PWA) in the infusion system:
❏
Power supply PWA
❏
Micro controller unit (MCU) PWA
❏
Display PWA
❏
Buzzer PWA
❏
Sensor PWA
❏
Bubble sensor PWA
Schematic diagrams supporting the operation of infusion system PWAs are in
The power supply PWA provides direct current (DC) power to system circuits and
charges the battery
(see Figure 9-23, Power Supply PWA Schematic (XL Domestic),
Figure 9-25, Power Supply PWA Schematic (XLM Domestic)
Supply PWA Schematic (XLM with DataPort))
. The power supply PWA consists of
switcher circuitry, voltage regulator circuitry, and battery charger circuitry. The following
sections describe these circuits.
The primary function of the switcher circuitry is to convert alternating current
AC (mains) line power to an is11 volts DC (VDC). Fuses F1 and F2, and
variable resistor VR1 provide protection against AC (mains) line-high voltage
spikes and excessive input power demands. Capacitors C1 and C2, transformer
T1, and inductor L1 attenuate the conducted emissions. Bridge rectifier U1, resistor R1,
and capacitor C3 provide the DC voltage required for switcher circuit. Diodes CR1 and
CR2, R2, R3, CR4, C4, and C9 provide the supply voltage to the current mode-switcher
controller integrated circuit (IC) U2. Transistor Q1, transformer T2, IC U2, and the
associated passive components are enclosed in a shielded box to minimize radiated
electromagnetic interference (EMI). U2 controls the duty cycle of Q1 through resistors R5
and R6. Resistor R9 provides current sensing. Resistor R8 and capacitor C7 filter the ramp
voltage across R9 and feed it back to U2.
EN-2
115 V
115 V
Summary of Contents for LifeCare XL Series
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