Nautel XR12, Руководство по предварительной установке, Страница: 37 / 76

XR12 Transmitter Pre-installation Manual Control and monitoring
Issue 0.17 2005-08-31 Page 6-3
Mod. Protection.
This alarm indicates that excessive low frequency modulation has triggered the
transmitter’s protection circuit.
Softstart Active.
The softstart relays are open for 1.6 seconds when the transmitter is first
powered on. The software should close the relays after 1.6 seconds and clear this alarm. When active,
this alarm causes a shutback and inhibits the RF drive and fan power supplies.
SoftStart OverTemp.
The temperature of the softstart resistors is greater than 150°C, and RF
power is inhibited. (The temperature is calculated by software based on the assumption that it rises
20°C for each cold start and 10°C for each warm start. The temperature falls exponentially between
starts. If the AC power is turned off, the software cannot calculate the temperature.) Warm or cold
starts are not recommended while this alarm is in effect.
Low backup battery.
The voltage of the backup battery has fallen below an acceptable level.
Replace the battery while the AC is on. (If AC power fails, and the backup battery is low or removed,
then the log files will be lost.)
PM Fault A.
There is a fault in power module A.
PM Fault B.
There is a fault in power module B.
PM Fault C.
There is a fault in power module C.
Remote control circuits and alarms
You can control the on/off status, the active (A/B) exciter, the on/off status of the RF power stage,
the preset RF power level, the power level adjustment, and system alarm reset remotely. You can
select an internal (single ended input) or external (differential input) input for each controlled
function. The external control circuits interface with the transmitter through opto couplers. The opto
couplers buffer and isolate the external circuits and prevent any unwanted transients from affecting
transmitter operation while remote control is selected at the transmitter.
The switching circuit for each remotely controlled function must be the equivalent of a normally
open (momentary) switch. Each switch must be configured to operate as a single-ended input using
the transmitter's +24 Vdc as the source, or as a differential input using an external DC power supply
(24 - 30 V). Each control function has positive and negative inputs .