Emerson E2 Návod k obsluze stáhnout pdf (Strana 27)

• Under normal operating conditions the

code will switch between Injection

Mode (

) and Normal (

) when not

using demand cooling.

3 Low Suction Pressure Cutout - The suc-

tion pressure has dropped below the pre-

set minimum allowable pressure (3 psi).

The compressor has been shut down and

will be available to run when the suction

pressure rises above the reset level.

• The module senses voltage drop

across the pressure switch to determine

whether the low suction pressure cutout

switch is open. The low suction pres-

sure switch is in series with the pilot cir-

cuit.

4 30 Second Reset - After initial power-up or

pressing the reset button, a 30 second

initialization takes place. The flashing

numbers indicate the subnet and address

labels, and may be used to verify that all

segments of the LED function. Self-diag-

nostics are performed during this time.

The compressor will remain off during the

reset period. This is the last code dis-

played in the reset sequence.

Flashing

Description

5 Low Oil Pressure Warning - The measured

oil pressure is below the minimum accept-

able value as signaled by the sensor on

the oil pump. While the

is flashing, the

module is determining how much longer to

allow the compressor to run based on the

same algorithm used in the Copeland®

brand Sentronic+™ oil pressure control.

• The sensor on the oil pump is an

open/closed switch, depending upon

net oil pressure. Any time the switch is

“open” prior to lockout, a

is displayed.

6 Low Oil Pressure Lockout - The compres-

sor is shut off due to low oil pressure.

Manual reset or remote reset is required to

enable the compressor to run again.

Remote reset must be pre-configured at

the E2 by the user.

• The algorithm will shut the compressor

off after 2 minutes of continuous low oil

pressure, or when intermittent periods

of unacceptable oil pressure exceed a

33% duty cycle.

• The

will be displayed until a manual or

remote reset takes place.

7 Motor Protection Trip - A high motor

temperature or high current condition has

shut down the compressor. The protector

must cool down and reset, or the sensors

must cool down and a minimum delay of 4

minutes must pass for automatic reset to

occur.

• An open line-break protector (2D/3D

models) is determined by the current

relay in the terminal box. When line

voltage is sensed at the motor termi-

nals and there is no motor current

detected by the relay, code

displayed.

• All 4D models use motor sensors. The

module shuts down the compressor

when the sensor resistance values

exceed the “trip” resistance value (this

is a function of temperature only). The

code is displayed until 4 minutes have

passed and the resistance drops

below the reset value. The compres-

sor will now run if the controller has

issued a run command.

8 Welded Contactor Warning - The

Intelligent Store™ Discus® has detected a

welded contactor condition after calling for

the compressor to shut off. The E2 will

command the compressor to run until the

condition is corrected.

• The Intelligent Store™ Discus® looks

for terminal plate voltage after the con-

tactor has been called to open. If volt-

age continues to be present (on any or

all terminals) - indicating the contactor

has been welded - the E2 will send a

run command to the compressor.

• The module will load the contactor so

all three legs are energized. The

code

will be displayed and the compressor

will run until the reset button is actuat-

ed (or remotely such as through the

E2). Manually throwing the breaker will

be required to shut the compressor

down if the contactor remains welded.

• The high and low pressure switches

are in series with the pilot circuit. If they

open, they will override the module in

calling for the contactor to remain

loaded.

• Manually loading the contactor after the

AE8-1337 R1

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