YK CENTRIFUGAL LIQUID CHILLER OptiView ... - Johnson Controls

7.3 VSD SCREEN
The 'VSD SCREEN' shows the motor current as a
percentage of full load amps (FLA), the current limit
setpoint (set locally (refer to 'LOCAL MOTOR
CURRENT LIMIT') or remotely by an analogue signal:
(0-20 mA, 4-20 mA, 0-10 Vdc or 2-10 Vdc) in the
analogue remote mode, or PWM signal in digital remote
mode or via the ISN/GPIC interface in the ISN mode)
and the pulldown demand time remaining, when
pulldown demand limiting is active.
The screen also displays the output voltage, frequency
and phase current to the motor, total and cumulative
input Kilowatts and PRV position. In addition, supply
kVA, power factor and voltage and current total
harmonic distortion are shown on models with harmonic
filters.
The 'LOCAL MOTOR CURRENT LIMIT' and
'PULLDOWN DEMAND LIMIT' and 'TIME' are also
programmed on this screen:
Local Motor Current Limit
Defines the maximum allowable motor current during
operation as a percentage of FLA. When the motor
current reaches or exceeds the programmed limit the
PRV are prohibited from opening or closed to reduce the
motor current.
Pulldown Demand Limit
Defines the maximum allowable motor current during
pulldown demand limiting at unit startup as a
percentage of FLA. This value overrides the 'LOCAL
MOTOR CURRENT LIMIT' for the time specified in the
motor current 'PULLDOWN DEMAND TIME'.
Pulldown Demand Time
Specifies the period of time that pulldown demand
limiting will be active during unit startup.
VSD Details - see Section 7.3.1
160-54-OI-GB0 13
ACC Details - Service Technicians
Filter Inhibit and Filter Details - Units with Harmonic
Filters
KWH Reset - Service Technicians