AMP Hour Meters or Ampere-Hour Meters
The amp–hour meter is an electronic meter, designed to monitor Amperes per time and to control dosing pumps or manual additions based on current feedback signals from power supplies used in electro-chemical processes. The system consists of a PLC with analog & digital I/O, and Relay outputs.
Using the HMI, users can setup, calibrate and scale a resettable Ampere per time counter and program up to 5 resettable timers with associated relay outputs to be used with Dosing pumps or as individual resettable Amp per time counters. The AHC50-A amp hour meter includes the following process automation and monitoring functions:
• 1 Non-Resettable 12 digital accumulating totalizers that monitor the 0-10vdc analog input
with the units selectable as ampere-seconds (As), ampere-minutes (Am), ampere-hours
(Ah). The totalizers count is based on the rectifier output ampere.
• 5 Resettable 8 digit accumulating totalizer that are monitoring the 0-10vdc analog input
with the units selectable as ampere-seconds (As), ampere-minutes (Am), ampere-hours
(Ah). The totalizer count is based on the rectifier output ampere and is programmable with
the following features.
• Each resettable totalizer has assigned a relay output that is pre-settable in the
second line with an 8 digit set value that can be used to disable the rectifier output
when the preset set value is reached or for alarm indication.
• Each resettable totalizer is assigned a latching accumulating timer that can be
activated and set along with the relay output for pumping applications.
• Output status monitor of the 4 relay outputs.
• Password protection with two levels of lockout protection. Level 1 prevents the user
from making any changes without entering the 4 digit password. Level 2 prevents
the user from making any changes to the set point value in any of the 4 resettable
counters
Input Voltage: 24VDC (20.4VDC to 28.8VDC with less than 10% ripple)
Input Current: Max 150 mA
Input Ratings:
Shunt feedback Signal: 0 – 10VDC
Input impedance: 20 k Ohm
Relay 1 – 4 Ratings:
Output type: SPST-NO (Form A)
Output Current: 5A Maximum (resistive load)
Rated Voltage: 250VAC / 30VDC
Minimum load: 1mA @ 5VDC
Life expectancy: 50k operations at maximum load
Weight: 337g (11.88 oz.)
The ACH50-A amp hour meter has 4 menus: The Totalizer menu screen is the home page screen (Step 3).
The sub menus pages are Rectifier Setup (Step 1), Resettable Setup (Step 2 & 4), and Protection Level setup
(Step5). When the ACH50-A is integrated into a package, the unit will be pre-programmed with the
correct rectifier current rating. The end user will be required to set steps 2 to 5, as required. Steps 4 & 5 are Protection Levels that can be changed by end user, if desired.
When purchased as a stand-alone unit the end user will be required to do steps 1 to 5. The analog input signal of 0-10vdc represents 0 to Maximum Amp Rating of the current output of the
Rectifier, based on its nameplate label.
AMP Hour Meters are used to give detailed information about a battery bank including voltage, amps going in or out, and charge remaining. Most ampere-hour meters also save historical information which is extremely useful for troubleshooting.
The amp hour meter registers ampere-hours and is an integrating meter similar to the watt-hour meter used to measure electricity usage in a home. Typical ampere-hour meters are digital indicators similar to the odometer used in automobiles.
The ampere-hour meter is a direct current meter that will register in either direction depending on the direction of current flow.
For example, starting from a given reading, it will register the amount of discharge of a battery; when the battery is placed on charge, it will operate in the opposite direction, returning once again to its starting point. When this point is reached, the battery has received a charge equal to the discharge, and the charge is stopped. It is normally desired to give a battery a 10% overcharge.
This is accomplished by designing the ampere-hour meter to run 10% slow in the charge direction. These meters are subject to inaccuracies and cannot record the internal losses of a battery. They attempt to follow the charge and discharge, but inherently do not indicate the correct state of charge. Similar to an ammeter, the ampere-hour meter is connected in series.
