Service

TABLE 3 – MICROBOARD PROGRAM SWITCHES

SW1

 

5 - 11

Not Used

1 -

Simulator mode - When this switch is closed

12 -

Watchdog Protection -Used in conjunction with

 

or in the ON position, the RCC simulates the

 

 

Program Jumper JP1 (see above) to enable/disable

 

data from 4 chillers and will not communicate

 

 

the program watchdog protection. With JP1

 

with any attached units.

 

 

IN, this switch setting has no effect. With JP1

 

ON: Simulator mode enabled. Used for dem-

 

 

OUT, this switch setting determines whether the

 

onstration.

 

 

watchdog protection is enabled or disabled.

 

 

 

 

 

 

OFF: Simulator mode is disabled. The unit

 

 

 

NEVER disable the watchdog protec-

 

 

 

 

 

must be powered on with the switch in this

 

 

 

 

 

 

 

tion! Severe compressor or chiller

 

position for the RCC to communicate with

 

 

 

 

 

 

 

damage could result. The ability to dis-

 

attached units and operate normally.

 

 

 

 

 

 

 

able the watchdog protection is provided

2 -

Not Used

 

 

 

 

 

 

for YORK factory testing only.

3 -

Not Used

 

 

 

 

 

 

 

4 -

Diagnostics - Enables or disables software

 

 

ON: Watchdog protection enabled.

 

 

OFF: Watchdog protection disabled.

 

diagnostics

 

 

 

 

 

 

 

ON: Enables software diagnostics. Disables normal control center operation

OFF: Disables software diagnostics. Enables normal control center operation.

5.0 VDC

J6

JP8

6 BRIGHTNESS CONTROL (+) OR (N.C.)

10 K

7 BRIGHTNESS CONTROL (WIPER)

8 BRIGHTNESS CONTROL (-)

JP7

NOTES:

1. J6-6 not connected (N.C.) to Backlight Inverter Board when display is manufactured by Sharp or NEC.

TO

BACKLIGHT

INVERTER

BOARD

LD04054

2.The position of Program Jumpers JP7 & JP8 determine the output at J6-7; In = Variable Voltage; Out = Variable Resistance. Refer to Program Jumper Listing in Table 2 for applications.

3.Potentiometer is actually an integrated circuit that is the electrical equivalent of a 10K potentiometer.

FIG. 34 – MICROBOARD LAMP DIMMER CIRCUIT

78

YORK INTERNATIONAL

Page 78
Image 78
York 00497VIP manual Microboard Program Switches, Tion! Severe compressor or chiller

00497VIP specifications

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