Guardian Series Battery Chargers

• Heavy duty float charging:
10A @ 12/24 VDC or 20A @ 24 VDC
• Auto boost operation
• Temperature compensation
• NFPA 110 alarm outputs
• High quality stainless steel case
• Suitable for wall mounting

The Guardian is a highly efficient, high performance battery charger. The output is configured for accurate fast charging, optimum battery life and reliability. High impedance transformer technology gives a low ripple output (<1%) for optimal charging of vented or sealed lead acid or NiCd batteries. The enclosed Guardian range can be used in a wide range of industrial charging applications, including standby engines, pumps and generators. Each charger consists of a transformer, rectifier and control circuit in a metal wall-mounted enclosure with DC ammeter and voltmeter. The control circuit ensures that the charger maintains the battery voltage at the pre-calibrated float level, while supplying any additional load current up to the specified maximum.

Auto Boost (Equalizing) Operation
Auto boost operation provides a temporary increase in output voltage, equalizing the battery charge between cells and maximizing battery life and capacity. Auto boost is triggered automatically when the battery falls below a preset voltage, and can also be triggered manually by linking two ‘boost’ terminals, e.g. using a panel switch or push-button. Once the batteries have reached the boost voltage level, Guardian reverts to its normal float charge mode, preventing battery over-charge and gassing.

Temperature Compensation
Guardian chargers can be configured (using circuit board links) to give automatic compensation of output voltage with varying temperature, ensuring optimal charging and cell life. Temperature is measured by a circuit board mounted sensor, or RTC option remote sensor complete with 9.5 ft (3m) lead assembly. When temperature compensation is enabled, output voltage decreases as ambient temperature increases at a rate of 1.66mV per °F per cell (3mV per °C per cell) –. see Output Calibration section.

Alarm Outputs
The Guardian provides 3 x NFPA110 compliant alarm relay outputs: battery low volts and battery high volts (both with 120 sec delay) and charge fail.

Installation and Connection
Wall or surface-mounting is via slots/holes in the stainless steel case. Connection to the wiring harness is by spring clamp terminals, through access holes in the case side. AC supply input and DC charge output are protected with circuit-board mounted fusing. Please see installation and operation instructions for full details.

Specifications
Electrical Connection
Dimensions & Weights
Output Calibration

Power supply
Operating voltage: 110 to 120 V AC, ±6%
Operating frequency: 50 and/or 60 Hz. model specific - see ‘Models Available’ section below

DC Charge Output
Nominal current: 10 or 20 A DC
Nominal voltage: 12 or 24V (see panel 4:"Output Calibration" for float voltages)
Float/boost voltage: see panel 4: "Output Calibration"
Voltage ripple: <1%

Alarm outputs
High volts, low volts and charge fail relays: SPDT dry/volt-free contacts, rated 1A @ 30 V DC, resistive load

Physical
Operating temperature: +14 to +131 °F / –10 to +55°C
Dimensions: see panel 3: Dimensions & Weights
Weight: see panel 3: Dimensions & Weights
Electromagnetic compatibility: EN61000-6-4 / EN61000-6-2

Notes:
1) DC charge (battery) output is isolated from the Guardian chassis.
2) Chassis must be connected to AC supply ground.
3) Alarm relay outputs shown in de-energized (powered down) state.
     High (battery) volts relay energizes 120 secs after fault condition.
     Low (battery) volts relay de-energizes 120 secs after fault condition.
     Charge fail relay de-energizes immediately on fault condition.

Overall:
               EG150, EG300 series         EG600 series
W               10.83” / 275 mm            13.19” / 335mm
H1              11.02” / 280mm             12.20” / 310mm
H2              2.95” / 75mm                  3.35” / 85mm
H3              3.54” / 90mm                  3.94” / 100mm
D1              4.92” / 125mm                5.71” / 145mm
D2              7.48” / 190mm                8.27” / 210mm

Fixing holes:
X 6.77” / 172mm 8.78” / 223mm
Y 10.04” / 255mm 11.22” / 285mm

Weight 22.0 lb / 10.0 Kg 38.5 lb / 17.5 Kg

Dimensions for reference only. Use actual product for mounting template. For safe heat dissipation, mount product in orientation shown, with minimum air-gap clearance of 40mm above/below and 25mm at side.

Calibration figures at 68°F / 20°C. Temperature compensation, if enabled, causes output voltage to automatically fall (or rise) with increasing (or decreasing) temperature, at a rate of approx 1.66mV per °F per cell (3mV per °C per cell).

For NiCd and sealed lead acid batteries, please consult your MurCal representative.

Models Available:

EG1501210C5LA (42701600) Enclosed Guardian UL, 12V
     vented lead acid/10A output, 120VAC (50Hz)
EG1501210C6LA (42701601) Enclosed Guardian UL, 12V
     vented lead acid/10A output, 120VAC (60Hz)
EG3002410C5LA (42701606) Enclosed Guardian UL, 24V
     vented lead acid/10A output, 120VAC (50Hz)
EG3002410C6LA (42701607) Enclosed Guardian UL, 24V
     vented lead acid/10A output, 120VAC (60Hz)
EG6002420C56LA (42701610) Enclosed Guardian UL,
     24V vented lead acid/20A output, 120VAC (50/60Hz)