Instruction Manual

MICROTEL Series 1000EX Dialer

CHAPTER 5 - Maintenance/Troubleshooting

he Series 1000EX Dialer is built to require minimal maintenance. Only three

items, the system battery, fuse, and internal clock, require your attention from

time to time for your dialer to continue performing with no problems.

BATTERY: A battery in typical standby use will last approximately 2 to 4 years.

Battery life is mostly dependent upon the number of power outages sustained and the age

of the battery. A new battery should take no longer than 24 hours to gain full charge,

capable of powering the system through a power outage of typically 6 hours. Battery

backup time may vary by a few hours depending on your I/O module configuration; the

battery backup time is proportional to the number and types of I/O modules you have

installed in your dialer.

Check the System Battery by using a DC voltmeter to measure the open circuit (no-load)

terminal voltage of the battery at room temperature (20 degrees Celsius). If the voltage is

less than 12.5 volts, the battery has a residual capacity of less than 50%. If the voltage is

less than 12.0 volts, the battery is completely worn out.

Refer to Chapter 2, Battery Connection, for instructions on installing a new battery and

adjusting the dialer’s battery charging circuit.

ONBOARD CLOCK: After initially setting time and date, periodically check the

accuracy of your dialer’s onboard clock. It may run a couple of minutes fast or slow per

month. In addition, you will have to set the time back/forward to correspond with

Daylight Savings Time. The time can be conveniently reviewed and adjusted over the

telephone by entering the touch tone command with the new time in 24-hour format

(0**060HHMM*). Refer to Chapter 3, Time and Date, for additional explanation and

examples.

An internal 3 Volt lithium cell maintains time/date when power to the dialer is removed.

It has a capacity of approximately a year. If power to your dialer is to be removed for an

extended period, consult the factory about removing an internal jumper to preserve

battery energy.

FUSES: Consult the following table for fuse replacement. Blown fuses can be

indicative of other problems. Verify field wiring and sensor electronics if replaced fuses

blow repeatedly.

For: Use the following:

Series 1000EX Dialer Littelfuse Micro 2A273 - Microfuse 2A/125V

Grayhill Output Modules Littelfuse Metric (5 X 20 mm) - Use Amp/Volt rating of old fuse

Opto 22 Output Modules Wickmann TR5 Sub-Miniature - Use Amp/Volt rating of old fuse