Manual Auto-Test; Remote Reset - Siemens Water Technologies Series Manual

3.3.6

Manual Auto-Test

3.3.7

Remote Reset

WT.050.130.000.UA.IM.1108
ACUTEC™ 35 SYSTEM
before inhibit was initiated, but the relays will not activate. Transmitters
may be calibrated while the inhibit is on without setting off external
alarms.
When the receiver is in inhibit, the display reads the actual signal down
to 0 ppm, and will read negative if the sensor is out of calibration. Nor-
mally, the microcomputer sets the display to zero when the signal is less
than two percent of full scale, to avoid false readings due to drift and
environmental conditions. Because relays are inhibited and the display
blanking is bypassed, the inhibit mode is convenient for calibrating the
Sensor/Transmitter.
Gas detection systems purchased with the optional Autotest Generator
may be tested by manual activation of the Generator from the receiver
module. This function will operate only if the Auto-Test configuration
switch D1 is "on". To manually start the Auto-Test function, with the Re-
ceiver in the normal mode, follow the sequence described in paragraph
3.3.5, Relay Inhibit, but press the push-button when the Sensor trouble
lamp is flashing. The horn will sound a quick beep and the green gas
indicator will begin to flash, indicating that the generator is running. The
system will go through a normal Auto-Test sequence, exactly the same
as the sequence used every 24 hours. The display will show increasing
gas values as the sensor begins to respond. When the microcomputer
identifies a successful test, the horn will sound one beep. The relay inhibit
indication will remain on until the sensor has had time to recover.
If the test fails, a Sensor trouble response will be initiated. Pressing the
push-button will silence the horn, but the Sensor trouble contact and
light will remain latched on, and cannot be reset until after a 10-minute
period. The Sensor/Transmitter should be checked. Either the Sensor or
Generator has failed, or something is physically blocking the path be-
tween the two. Methods for testing individual gas sensors can be found
in Section 4 – Service.
Receivers are provided with input terminals for connection of a remote
reset switch. The remote reset input provides horn silence and alarm reset
functions using a switch located at any remote point. When receivers are
located at sites with telemetry equipment, the remote reset input may
be connected to a relay contact in the telemetry system.
The remote reset input accomplishes the same acknowledge and reset
functions as the push-button on the front panel. When a switch closure
is detected across the remote reset terminals, the detector horn will si-
lence and any latching relays will reset, provided that the gas condition
28