158
Process and Application Parameters [300]
Section 11-3
[342] = 2 s (inactive since [386] is activated and have higher priority)
[381]= On
[386] = 10 s
[387] = 1 Bar
The VSD will stop/sleep when the speed (PID output) is below or equal to Min
Speed for 10 seconds. The VSD will activate/wake up when the “Process
value” goes below the PID Activation Margin which is related to the process
reference, i.e. goes below (20-1) Bar. See Fig. 82.
Fig. 82
PID Stop/sleep with normal PID
Example 2 PID control = inverted (tank level control)
[321] = F (AnIn)
[322] = m
[310] = 7 m
[342] = 2 s (inactive since [386] is activated and have higher priority)
[381]= Inverted
[386] = 30 s
[387] = 1 m
The VSD will stop/sleep when the speed (PID output) is below or equal to Min
Speed for 30 seconds. The VSD will activate/wake up when the “Process
value” goes above the PID Activation Margin which is related to the process
reference, i.e. goes above (7+1) m. See Fig. 83.
Fig. 83
PID Stop/sleep with inverted PID
PID Steady State Test [388]
In application situations where the feedback can become independent of the
motor speed, this PID Steady Test function can be used to overrule the PID
operation and force the VSD to go in sleep mode i.e. the VSD automatically
reduces the output speed while at the same time ensures the process value.
Example: pressure controlled pump systems with low/no flow operation and
where the process pressure has become independent of the pump speed,
e.g. due to slowly closed valves. By going into Sleep mode, heating of the
pump and motor will be avoided and no energy is spilled.
PID Steady state test delay.
[711] Process Value
[387]
[712] Speed
[341] Min Speed
[386]
Stop/Sleep
[310] Process Ref
Activate/Wake up
[711] Process Value
[387]
[712] Speed
[341] Min Speed
[386]
Stop/Sleep
[310] Process Ref
Activate/Wake up
Summary of Contents for SX-F
Page 2: ......
Page 14: ...6 Table of contents...
Page 20: ...12 Glossary Section 1 6...
Page 32: ...24 Cabinet mounting Section 2 3...
Page 58: ...50 Connecting options Section 5 6...
Page 72: ...64 Load Monitor and Process Protection 400 Section 7 5...
Page 74: ...66 EMC standards Section 8 1...
Page 266: ...258 System Data 900 Section 11 9...
Page 274: ...266 Maintenance Section 12 3...
Page 284: ...276 Liquid cooling Section 13 12...
