Carrier 23XL Dokumentacja Pobierz pdf (Strona 52)

Table 7 — Potentiometer Adjustment

DIAL

ADJUSTMENT RANGE

FUNCTION

FACTORY

SETTING

Minimum

(CCW)

Maximum

(CW)

Starting Current 100% 400% Sets initial starting

current level.

100%

Ramp Time

(Adjustable

Current Ramp)

seconds

Sets time during which

current ramps from the

initial starting level to the

maximum possible

current limit setting.

10 seconds

Current Limit 100% 400% Sets maximum

starting current.

250%

Pulse Start 0 (Off) 2 seconds Sets duration of 400%

current pulse. Pulse

is used to break

load free.

OFF

Current Trip 50% 400% Sets running current trip. 175%

Power Saver — — — OFF

CCW — Counterclockwise

CW — Clockwise

Starting Current — The torque required to start a machine

(initial torque) varies from one application to another. Start-

ing current may be adjusted to match the initial motor torque

of the application. The starting current value is adjustable

from 100% to 400% FLA and is factory set at 100%. If quick

acceleration is desired, set the starting current at a higher

level.

Ramp Time (Adjustable Current Ramp) — The motor cur-

rent is ramped up from the starting current value over a timed

period set by the ramp time potentiometer (adjustable from

2 to 30 seconds at 400% current limit setting). The 23XL is

factory set at 10 seconds. However, based on jobsite con-

ditions, a range of ±5 seconds is acceptable.

Current Limit — This protection limits motor current to a

set value and holds motor torque at a reduced level during

motor start. The current limit is adjustable from 100% to 400%

of the motor full load current value. The current limit is fac-

tory set at 250%.

Pulse Start — A pulse start is not used on this machine. It is

set to the OFF position.

Current Trip —Acontrol contact closes when the motor reaches

a factory set value of 175% of full load amps. This signal is

used as an interlock to shut down the machine if the motor

stalls (increasing load).

Changing Adjustments — The settings are interdependent.

If any setting is changed, the other settings should be checked.

Check the settings in the sequence shown above.

Voltage Measurements — Consider the following when check-

ing voltage measurements:

• Before energizing the starter, check the incoming lines for

properly balanced voltages.

• Close the circuit breaker to apply power to the starter. Verify

the 120 vac control voltage.

• Visually check to ensure that all fans are running (if

applicable).

• Verify phase sequence at line terminals. Incorrect phase

sequence will result in a shunt trip of the circuit breaker.

• Verify that the phase rotation of the lines to the motor is

correct.

• If the motor is found to be rotating in the wrong direction,

interchange any two phases to the motor.

• Start the unit.

• When unit reaches full speed, monitor the running current

to ensure that the motor is not overloaded.

High Altitude Locations — Recalibration of the pres-

sure transducers will be necessary since the machine was

initially calibrated at sea level. Please see the calibration pro-

cedure in the Troubleshooting Guide section on page 68.

Input the Design Set Points — Access the LID Set

Point menu and view/modify the Base Demand Limit set point

and either the LCW set point, the ECW set point, or Ice Build

set point. The PIC can control a set point to either the leav-

ing or entering chilled water. This control method is set in

the Equipment Conﬁguration menu Conﬁg table. See

Fig. 21.

Input the Local Occupied Schedule (OCCPC01S)

—

Access the schedule OCCPC01S screen on the LID and

set up the occupied time schedule per the customer’s re-

quirements. If no schedule is available, set it for 24 hours

occupied days per week including holidays. This is also the

default setting of the schedule. For this schedule, modify Pe-

riod 1 for ON at 0000 and OFF at 2400 and enable the pe-

riod to be in effect for all days and holidays. For more in-

formation about how to set up a time schedule, read the Controls

section, page 13.

The CCN Occupied Schedule (OCCPC03S) should be con-

ﬁgured if a CCN system is being installed or if a secondary

time schedule is required. It normally is input through the

CCN Building Supervisor, but it can also be modiﬁed at the

LID.

Fig. 39 — Typical Potentiometer Adjustment

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 103 104

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