Rockwell Automation 1397 Regulated Field Supply Card - Manual (Page 14)

14 1397 Regulated Field Supply Card
1397 – 5.17 September, 1997
Setup
(continued)
Overvoltage Protection Parameters
P.046 [Motor Arm Volts]
Armature overvoltage protection is always active regardless of the
type of feedback. This reduces the chance of overvoltaging the
armature due to a weakened field. An overvoltage fault occurs when
the armature terminal voltage exceeds 130% of parameter
P.046 [Motor
Arm Volts] .
Overspeed Protection Parameters
P.039 [Feedback Type]
P.044 [Motor Field Amps]
Overspeed detection is active only when a tachometer or encoder is
being used and parameter
P.039 [Feedback Type] is set to DC Tach,
Encoder or AC Tach. Because of this, field weakening is limited
when
P.039 [Feedback Type] is set to Arm Volt and the drive is configured
as a voltage regulator. P.277 [Fld Loss Level] is limited to a low value —
50% of P.044 [Motor Field Amps] if P.039 [Feedback Type] is set to Arm Volt.
Field Economy Parameters
P.044 [Motor Field Amps]
P.175 [Fld Econ Active]
P.273 [Fld Econ Delay]
P.274 [Fld Econ Ref]
Parameter P.175 [Fld Econ Active] indicates that field economy is active.
Field economy is active from the time the motor stops or the the drive
is powered up and after the time delay set in parameter
P.273 [Fld Econ
Delay] expires.When the Regulated Field Supply Card is operating in
the fixed voltage mode, a constant field voltage is generated
regardless of the state of
P.175 .
To provide field economy for the Regulated Field Supply Card,
parameter
P.274 [Fld Econ Ref] is set as a reference. The value of P.274 is
entered as a % of P.044 [Motor Field Amps] . To avoid nuisance field loss
faults, the value of P.274 must also be set > P.277 [Fld Loss Level] .