Watson-Marlow qdos H-FLO Reference Manual page 121

15.2.5.3 Set Minimum/Maximum speeds
Min/Max Speed parameters are used to set Min/Max speed from PROFIBUS interface:
Values must only be used if matching bit in Control Word is enabled and not zero.
•
Values are 16 bit unsigned in deci RPM (1/10th of pumphead RPM).
•
If pump is required to operate at lower speed than user defined minimum
•
speed parameter data, (bytes 3, 4) pump will operate at defined minimum
speed.
If maximum speed configured in user parameter data, pump is limited to
•
this maximum speed even when master requests a higher rpm.
15.2.5.4 Fail safe
The fail-safe user parameter is used to set the correct course of action to take in the event of a
PROFIBUS communications failure. The fail-safe byte is configured as shown in the following
1
table .
1
NOTE If no bits set or invalid pattern is set, default fail safe behaviour stops pump
Hex
0x00
0x01
0x02
15.2.5.5 Fail safe speed
Fail-safe speed parameter used to set speed at which pump should be driven if a PROFIBUS
communications error occurs and fail- safe user parameter is set to 0x02.
Description
No fail safe action
Continue running using the last speed set point
Continue running using the fail-safe speed
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