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18.1.2 Configuring the VSD
The VSD must be configured in accordance with the type of motor connected.
The acceleration and deceleration ramps must be set about 30% shorter than the ramps
parameterized in the electronic fuel-air ratio control system of the LMV5.
Example: Drive ramp of 10 seconds ⇑ VSD ramps to be set to 7 seconds
Drive ramp of 30 seconds ⇑ VSD ramps to be set to 20 seconds
Drive ramp of 60 seconds ⇑ VSD ramps to be set to 40 seconds
The motor must be able to follow the parameterized VSD ramp.
If this is not observed, the predefined speeds will not be reached within the respective
periods of time.
The configuration of the current / voltage interfaces of the VSD must be in accordance
with the configuration of the VSD module in the LMV5.
The minimum output frequency of the VSD must be set to 0 Hz. To ensure that the fan
motor reaches the required speed under all operating conditions, the VSD during
configuration is controlled with a maximum of only 95% of the positioning signal. If the
burner's rated capacity calls for full fan speed, the maximum output frequency must be
set to 105.2% of mains frequency.
It is recommended to internal control of the internal VSD plus slippage or load
compensation since they might adversely affect speed control in the VSD module.
18.1.3 Configuring speed acquisition
The speed sensor to be used must be an inductive sensor (Namur or open collector
(pnp) (refer to chapter Inputs / Outputs). The motor speed is acquired with an
asymmetric sensor disk having 3 protrusions spaced at 60°, 120° and 180° respectively.
The number of protrusions must be appropriately parameterized. The sensor disk is to
be fitted such that the pulse intervals are generated in the direction of rotation as
described.
Since the different types of motors have different maximum speeds, the VSD module must
know the speed that corresponds to 100%.
Parameter
Num Puls per R
Basic Documentation LMV5...
18 VSD module
243/327
CC1P7550en
22.05.2018
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