Rockwell Automation FlexPak 3000 Digital DC Drive Version 4.3 - Manual (Page 86)

8-2 FlexPak 3000 DC Drive Software Reference
8.1 Configuring Field Economy
Field economy is available if the Enhanced Field Supply kit or Field Current Regulator
kit is installed. It is not available if you are using the standard field supply.
Field economy reduces the field voltage when the motor is at rest, reducing standby
power consumption and prolongs the insulation life of the motor field windings.
When the Field Current Regulator kit is installed, the drive enters field economy when
the drive is first powered up. When the armature becomes active, the drive goes to full
field. After the drive stops, field economy becomes active after the time specified by
FIELD ECONOMY DELAY (P.501). The field economy level is adjustable through FIELD
ECONOMY REF (P.511).
When the Enhanced Field Supply kit is installed, the drive powers up at full field. Field
economy is fixed at 45% of AC line voltage. After the drive stops, field economy
becomes active after the time specified by
FIELD ECONOMY DELAY (P.501).
FIELD ECONOMY ACTIVE (P.599) indicates when field economy is active.
The field current reference for the field loop changes depending on whether or not
field economy is active. If field economy is:
• Inactive: FIELD REF REGISTER (P.513) is limited and is the field current reference.
• Active: MOTOR HOT FLD AMPS (P.510) and FIELD ECONOMY REF (P.511) are multiplied
and used as the field current reference.
You can check the value of the field current reference by looking at FIELD REFERENCE
(P.590) . This reference is summed with FIELD FEEDBACK and fed into the field PI block.
If the Field Current Regulator kit is installed, you can adjust the field economy current
level using
FIELD ECONOMY REF (P.511). FIELD ECONOMY REF and/or FIELD REF REGISTER
(P.513) must be above FIELD LOSS THRESHOLD (P.512) to avoid field loss faults. The
field loss logic is disabled while in field economy.
!
ATTENTION: The incorrect configuration of these parameters can cause
a motor overvoltage condition. Configure
MOTOR HOT FLD AMPS (P.510)
to the motor’s nameplate value. Failure to observe this precaution can
result in bodily injury and damage to the equipment.
FIELD ECONOMY ACTIVE
(P.599)
Indicates the present
state of field
economy.
This parameter has
no effect if the
standard field supply
is installed.
Parameter Range: ON
OFF
Default Setting: n/a
Parameter Type: Output
OIM Menu Path(s): Field - Standard/enhanced Field Supply
Field - Field Current Regulator - Field Loop Test
Points