Bypass Mode - WEG CFW501 V1.8X Programming Manual

P0582 – Fire Mode Auto-reset
Adjustable 0 = Limited
Range: 1 = Unlimited
Properties: cfg
Access groups HVAC
via HMI:
Description:
This parameter defines how the auto-reset functionality will work in Fire Mode when a critical fault occur (DC
Bus Overvoltage (F0022) and Overcurrent/Short-circuit (F0070)).
P0582

18.10 BYPASS MODE

The Bypass Mode allows the motor controlled by the CFW501 to be directly driven by the three-phase power supply
by means of an external contactor the will make the connection. In order to achieve that, two contactors will be
necessary, one for connecting the motor to the drive and another for connecting a rede de alimentação e o motor.
The contactors will be driven by two digital outputs (DOx) previously programmed for "Drive Bypass Contactor"
and "Mains Bypass Contactor", and they will have an electric interlocking logic.
When entering Bypass Mode, the Alarm "A0210" will be generated and shown at the HMI. This state can also be
verified in the Parameter P0006 and P0680.
The "Bypass" condition is identified by the inverter by means of a digital input (DIx) programmed for "Activate
Bypass"; when in logic level "1" (24 V), it executes a "General Disable" command (the motor will coast to stop) and
will signal that the Bypass Mode is active in both P0006 and P0680. Following that, the digital output DOx set
to "Drive Bypass Contactor" is reset after a delay for demagnetizing the motor. This delay is given by the formula
tdes=(Speed/Rated Speed) x3s for (Speed <= Rated Speed) and is fixed at 3s for (Speed > Rated Speed). After
this time elapses, the time programmed in P0584 is counted (in order to ensure that the drive output contactor
is really open) to activate the digital output programmed for "Mains Bypass Contactor", and the drive goes to
"Bypass" while the digital input programmed for "Activate Bypass" is active (24 V).
For the inverter to return to drive the motor, first the "Bypass" must be deactivated making the digital input
programmed for "Activate Bypass" inactive (0 V). That makes the digital output programmed for "Mains Bypass
Contactor" be deactivated instantly and the CFW501 remain with the two outputs deactivated, waiting for the "Run"
command. After the "Run" command, the logical status of the digital input programmed for "Activate Bypass" is
verified and, if it is in logical level "0" (0 V), the deactivation of the "Bypass Mode" is indicated in parameters P0006
and P0680, and the time count for the motor demagnetization to activate the digital output programmed for "Drive
Bypass Contactor" starts. After this time elapses, the digital output programmed for "Drive Bypass Contactor "
is activated, thus closing the contactor in the inverter output, and the count of a dead time defined by parameter
P0584 to ensure the contactor is closed starts. After the end of the dead time, the inverter enables the pulses in
order to enable the CFW501 to drive the motor again.
This activation logic is shown in
Table 18.13: Options for the parameter P0582
0 Limited. Auto-reset works as defined in P0340 parameter.
1 Unlimited. The auto-reset happens after 1s of a critical failure
detection regardless of the value set in P0340.
Figure 18.2: Bypass mode activation logic on page
Factory
Setting:
Description
18-32.
HVAC Functions
0
CFW501 | 18-31
18