DURAG D-R 290, Руководство по эксплуатации

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5 | Installation
D-R 290 95
The potentiometer (P2)
“Hysteresis“ adjusts the fluctuation range for the response of
the D SK 290 system to a variation in the purge air flow from the air flow set by P1. If
the fluctuation range is set too small, the protective shutter will open and close contin­
ually.
P1 air flow
P2 hysteresis
Fuse
Fig. 5.26: D‑SK AE control electronics
After the settings for commissioning have been made, the housing should be closed:
1. Close the hinged assembly frame with the transparent cover.
2. Use a screwdriver to turn the twist lock catch on the right side of the housing clock­
wise.
The operation of the fail-safe shutter whilst the device is in operation can be per­
formed by briefly switching off the purge air supply or by disconnecting the purge air
hose.
There will be a delay before the shutter closes, because the air flow monitor detects
the failure of the purge air only at intervals given by a time constant.
If the commissioning has been performed correctly but the shutter does not operate,
the motor current protection switch in the housing of the shutter motor may have trip­
ped.
To reactivate the motor current protection switch, undo the two socket-head screws on
the cover of the motor, remove the cover and push the actuation button on the motor
current protection switch back in.
If the shutter does not open or close within 3 minutes, the measuring head sets a
"shutter blocked" flag. The connection between terminals 16 and 17 (see Fig. 5.22 ) is
then opened so that the shutter closes. This safety function can be deactivated by re­
setting the blocking message e.g. by using the D-ESI 100 software or by restarting the
measuring head.
Setting path:
> Specific parameters > D−R 290 device status > Fail-safe shutter > Fail-safe
shutter 1 blocked and deactivated
or
> Specific parameters > D−R 290 device status > Fail-safe shutter > Fail-safe
shutter 2 blocked and deactivated
Resetting the blocking message to the value "0" restores the connection of the termi­
nals16 and 17 through the measuring head.
Motor current
protection
switch
Fig. 5.27: Shutter motor