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D) LVD Operation and Programming
Low Voltage Disconnect: The PFM-500 incorporates a 500 amp LVD circuit which automatically removes the battery
when battery voltage drops to a pre-set DISCONNECT threshold (or when manually activated- see section 5.11) and
automatically re-connects the battery when battery voltage rises above the selected CONNECT threshold (see Specification
8.0 for default LVD thresholds and adjustment ranges)
1)
Manual/Auto Selector Switch:
The LVD selector switch, located on front panel, sets the way the LVD circuit functions.
• Manual connect - Battery always online
• Automatic - LVD function enabled (factory default)
• Manual disconnect - Battery always offline
2)
LVD Adjustment:
The PFM-500 offers easy adjustment of both dis-connect and re-connect LVD settings without the need
for an external, adjustable power supply. These thresholds can be selected on the front panel meter from the SETTINGS
page (see Flow Chart on page 10) using the menu knob, the default factory setting for the particular item is also displayed.
A press on the menu knob will save the settings and is retained even after powering down the unit. LVD threshold
adjustment can be made while the system is operating.
3)
LVD Alarms:
Pre-disconnect & disconnect - Two external alarms can be triggered by the PFM-500: the Pre-disconnect
(‘PRELVD’) and the LVD dis-connect (‘LVDDISCON’). The LVD Pre-disconnect alarm is a warning to an impending battery
disconnect. It is triggered by an adjustable voltage thresholds set above the LVD dis-connect threshold and below the
re-connect threshold. The LVD dis-connect alarm is automatically set using the LVD dis-connect threshold (see 5.12). Both
alarms will trigger the LED Alarm light.
4) LVD Voltage Sequencing Example - 12 VDC shown
12.5v NORMAL SYSTEM VOLTAGE
12.3v LVD RE-CONNECT
(ADJUSTABLE)
11.6v PRE-DISCONNECT WARNING ALARM
(ADJUSTABLE)
11.0v LVD DIS-CONNECT
(ADJUSTABLE)
a) Normal Voltage:
Typical system voltage with rectifiers supplying load(s), batteries not deeply discharged.
b) LVD Re-Connect:
Level at which the battery will be re-connected after a dis-connect event when system voltage is
restored.
c) Pre-LVD Alarm:
Level at which the pre-LVD alarm contact triggers as an early warning for impending low battery
disconnect. (See Specification Section 8.0 for factory default.)
d) Battery Dis-Connect:
Minimum allowable battery voltage level has been reached and will disconnect battery to
prevent damage. Will also trigger LVD alarm. (See Specification Section VI: Specifications for factory default.)
