Cosmos PS-7 - 7.3 Trouble Alarm Operating Instructions

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DC-ITD-PS7MAN01.A www.dodtec.com
JAN 2019 815-788-5200
PS-7 Manual
7.3 Trouble Alarm Operating Instructions
The trouble alarm will be activated in the following situations. (The open collector will be ON in normal mode,
and OFF during trouble or when the power is disconnected.) The TROUBLE lamp (yellow) will blink, and analog
output will drop to below 0.6 mA. When the problem is remedied, the trouble alarm will automatically return to
normal.
1. Decrease in the rate of flow
When the flow is not at the designated rate, it is assumed that it is decreasing. FLOW Is
displayed on the LCD screen, and the flow rate rotation stops. Causes for a decrease in flow
rate can include the clogging of filter elements, the clogging of pipes, the load being too high,
deterioration of the pumps, etc.
2. Sensor trouble
SENS. will be displayed on the LCD screen in the following situations:
• When the base output of the sensor unit has decreased significantly
• When the sensor has been disconnected. (For combustible gas sensor unit: CHS-7.)
3. When a sensor unit has been inserted wrong
The settings, full scale values, and target gases to be detected are recorded in a detector after
its first use. When a sensor unit with different settings information is inserted, this is
determined to have been inserted wrong, and SENS. is displayed on the LCD screen. The
concentration of the detected gases is displayed as: ‘’- - - -”
4. Disconnection of the pyrolyzer
When the pyrolyzer has been disconnected after used, CONV. is displayed on the LCD screen.
5. Disconnection of the power source
When the power source has been cut, all lamps (green, yellow, and red) will turn off, and all
operations will cease.
6. A blown fuse
When a fuse has blown, or is disconnected, the power source becomes cut, and all lamps (green,
yellow, and red) will turn off, and all operations will cease
NOTE: When the trouble alarm is activated while using the oxygen sensor unit COS-7, the analog output is
reduced to less than 0.6 mA. When the host system setting is the lower limit alarm, trouble will occur if the
analog output from the main unit drops to less than 0.6 mA within one second from the time that the lower
limit alarm is not activated. To avoid this, set it so that the lower alarm limit is not activated.
○: On : Blinking ●: Off
Type of trouble
LCD display
POWER
Lamp
(green)
TROUBLE
Lamp
(yellow)
ALARM
Lamp (red)
Remarks
1
Decrease in rate of
flow
FLOW
○

●
The flow rate rotation is
stopped
2
Sensor trouble
SENS.
○

●
3
Incorrect insertion of
the sensor unit
SENS.
○

●
The gas concentration display
shows “- - - -”
4
Pyrolyzer failure
CONV.
○

●
5
Disconnection of the
power source
(Nothing)
●
●
●
6
Blown fuse
(Nothing)
●
●
●