Next Step Alternator Regulator

Installation and Operating Instructions

Ample Power Models NEXT-12P and NEXT-24P July 24, 2000


Mounting the Regulator
The regulator is protected against ambient humidity, but must be mounted in a dry location free of moisture, dust and other environmental insults. The regulator will operate in temperatures to 70$^\circ $C (158$^\circ $F).

Wiring Diagram
The wiring diagram above is the only way to wire the Next Step Regulator. Do not wire in any other way, such as combining ground wires or battery positive wires. Use fuses where shown. Failure to do so may result in fire.

Signal Names and Functions
Battery voltage set-points are specified for each voltage system, 12 or 24 volts, as 12 / 24 volts, respectively.

State Indicator
The green LED shows at which set-point the regulator is presently operating. Status is shown by flashing the green LED with On and Off time in seconds as shown below.

Table 1. Green Status LED

Status On Off
Bulk Charge 2 1
Absorption Charge 1 1
Absorption Charge & OK to Adjust continuous N/A
Step to Float 3 3
Float Charge 2 2
Gas Lock 3 1
ABS Hold 1 3

Error Indicator
Abnormal conditions are reported with the Red LED, and the external lamp/alarm, if wired. Errors are identified by On and Off times of the Red LED as shown below.

Table 2. Red Error LED

Error On Off
Can't turn field off 1 1
Can't turn field on 1 3
Bat. Volts disconnected 3 1
Over Temperature 3 3
Voltage Runaway 6 3
Bad Temperature Sensor 6 6

Voltage Adjustment
The factory setting is 14.4 / 28.8 Volts. The float voltage is 0.8 / 1.6 Volts less than the absorption set-point. Before adjusting absorption voltage disconnect the T+ (RED) connection from the regulator.

Absorption voltage can be adjusted by turning the small screw on the potentiometer behind the hole in the cover marked ABSORPTION VOLTAGE. The potentiometer is 20 turns. Turn in small increments and wait at least 3 seconds for the adjustment to take effect.
Do not adjust the potentiometer unless the green LED is on continuously.

Absorption Time Adjustment
How long the regulator stays in absorption state is factory set at one hour. It can be changed from 0 to 255 minutes by turning the potentiometer behind the hole in the cover labeled TIME. To make this adjustment convenient, a multi-meter can be used. Place the positive lead in the TIME TEST POINT located within the regulator cover, and the negative lead on ground. Time is read on the multi-meter voltage scale where every 0.02 Volts is equal to 1 minute of absorption time. Factory setting is 1.18 Volts.

What You Should See
When the regulator is first turned on, the red LED will glow for 5 to 8 seconds before extinguishing. The alternator should start to charge after the red LED goes off. Then the green LED will start to flash status information.  For example: 2 seconds on, 1 second off, (bulk charge).

Alternator Requirements
The alternator must be an externally regulated model with one brush connected to ground and the other brush fitted with a connection to make the field connection, (P-type). Be advised that alternators not hot rated for continuous operation at high current and temperature may fail when driven by the regulator.

First, look at the Signal Names and Functions section above and make sure that all required wires are in place and properly connected. We have found that moving a wire such as BAT.VOLTS or GROUND a few feet away from a good Battery Positive or Negative Distribution could result in undesirable regulation due to voltage spikes in the system. To help diagnose voltage set-points, remove the T+ (RED) connection to prevent a faulty temperature sensor from affecting the system.

Second, if the problem still exists, obtain a copy of the Next Step Troubleshooting Guide which is available from the following sources:

Regulator Service Center

The troubleshooting guide was designed to help isolate a majority of the installation problems. Fill out the Troubleshooting Guide to determine if all measurements meet the specified requirements.

Finally, if you are unable to remedy the problem, contact the regulator service center with the Next Step Troubleshooting Guide completed for referencing.

\epsfig{file=AP.EPS,width=1.6in} Ample Power Products by Ample Technology,2442 NW Market Street, Suite #43, Seattle, WA 98107