Specifications

73
Table 12 — Job Site Parameters
*With variable flow systems this point may be configured to the lower end of
the range.
NOTE: Other parameters: Screens are normally left at the default settings;
they may be changed by the operator as required. The time and persistence
settings on the ISM_CONF table can be adjusted to increase or decrease the
sensitivity to a fault condition. Increasing time or persistence decreases sensi-
tivity. Decreasing time or persistence increases sensitivity to the fault
condition.
PARAMETER TABLE
Starter Type
ISM_CONF — Select 0 for full voltage, 1 for
reduced voltage, or 2 for solid state or 3 for vari-
able frequency drive.
Motor Rated Line
Voltage
ISM_CONF — Motor rated voltage from chiller
information nameplate.
Volt Transformer
Ratio
ISM_CONF — Enter ratio (reduced to a ratio to
1) of power transformer wired to terminal J3 of
ISM. If no transformer is used enter 1.
Motor Rated
Load Amps
ISM_CONF — Per chiller nameplate data. RL
AMPS on compressor nameplate.
Motor Locked
Rotor Trip
ISM_CONF — Per chiller identification name-
plate.
Starter LRA
Rating
ISM_CONF — Enter value from nameplate in
starter cabinet MAXIMUM FUSE. This value
shall always be “9999” for Benshaw RediStart
MX3 wye-delta and solid-state starters.
Motor Current
CT Ratio
ISM_CONF — Enter ratio (reduced to a ratio to
1) of current transformers wired to terminal J4 of
ISM. This value shall always be “100” for Ben-
shaw RediStart MX3 wye-delta and solid-state
starters.
Current% Imbalance
ISM_CONF — Current imbalance trip threshold.
Enter up to 100% for starter type 3 (VFD).
Ground Fault
Current
Transformers
ISM_CONF — Enter 0 if no ground fault CTs are
wired to terminal J5 of ISM. Enter 1 if ground
fault CTs are used.
Ground Fault
CT Ratio
ISM_CONF — Enter ratio (reduced to a ratio to
1) of ground fault CT.
Single Cycle
Dropout
ISM_CONF — ENABLE if motor protection
required from drop in line voltage within one
cycle.
Line Frequency
ISM_CONF — Enter YES for 60 Hz or NO for
50 Hz.
Line Frequency
Faulting
ISM_CONF — ENABLE if motor
protection required for drop in line
frequency.
Surge Limit/Hot Gas
Bypass Option
OPTIONS — Enter 1 if HGBP is installed. Enter
0 otherwise.
Minimum Load
Points (T1, P1)
OPTIONS — Per Chiller Requisition (DT1, DP1)
if available or per job data — See modify load
points section. For VFD units refer to table
located in control panel.
Low Load Points (T2, P2)
OPTIONS — Per Chiller Requisition (DT2, DP2)
if available or per job data — See modify load
points section. For VFD units refer to table
located in control panel.
PARAMETER TABLE
Mid Load (T3, P3)
OPTIONS — Per Chiller Requisition (DT3, DP3)
if available or per job data — See modify load
points section. For VFD units refer to table
located in control panel.
Full (Maximum)
Load Points (T4, P4)
OPTIONS — Per Chiller Requisition (DT4, DP4)
if available or per job data — See modify load
points section. For VFD units refer to table
located in control panel.
Minimum Load
Points (Tsmin, IGVmin)
OPTIONS — Per Chiller Requisition (Tsmin,
IGVmin) if available or per job data — See mod-
ify load points section. Refer to table located in
the control panel.
Full (Maximum) Load
Points (Tsmax, IGVmax)
OPTIONS — Per Chiller Requisition (Tsmax,
IGVmax) if available or per job data — See mod-
ify load points section. Refer to table located in
the control panel.
Surge Line Shape Factor
(shapefac)
OPTIONS — Per Chiller Requisition (shapefac).
Refer to table located in the control panel.
Chilled Medium SETUP1 — Enter water or brine.
Evaporator
Refrigerant
Trippoint
SETUP1 — Usually 3° F (1.7° C) below design
refrigerant temperature.
Evaporator Flow
Delta P Cutout
SETUP1 — Per Chiller Requisition if available or
enter 50% of design pressure drop to 0.5 psi
(3.4 kPa).*
Condenser Flow
Delta P Cutout
SETUP1 — Per Chiller Requisition if available or
enter 50% of design pressure drop to 0.5 psi
(3.4 kPa).*
High Condenser Water
Delta P
SETUP1 — Enter the maximum allowable value
for condenser water pressure drop.
Diffuser Option
(Compressors with Split
Ring Diffusers)
SETUP2 — ENABLE for 4 and 5 size compres-
sor with split ring diffusers. See model number
nomenclature.
Diffuser Option —
Software Version 10 and
Higher (Compressors
with Split Ring Diffusers)
VDO_SRD ENABLE for Frame 4 and 5 compres-
sors with Split Ring Diffusers. See model number
nomenclature.
Diffuser Full Span mA
(Compressors with Split
Ring Diffusers)
SETUP2 VDO_SRD (Software version 10 and
higher) — Enter diffuser actuator full span mA
rating for 4 and 5 size compressor. Value is
located on label on side of diffuser actuator
motor.
Motor Rated
Kilowatts
RAMP_DEM — Enter value from chiller requisi-
tion form (product data submittal) if DEMAND
LIMIT SOURCE is set to kW.