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Control System 58

Service Manual – SC6500

™

Designation Pin ID

Wire ID/

Color

Description

Signal

Characteristics

Nominal

Value (when

activated)

Reference

To:

Acceptable

Range

Measured Comments

Output J2-20 BLK/WHT

Speed Control -

Mode Sel 2

Voltage 0 or 36V B- (ground)

18.6V

0.03V

Traction on

Traction off

Output J2-21 BLK/ORN

Auxiliary

Contactor

Voltage 0V B- (ground) 0 - 1V

37.4V key off

0.08v key on

Output J2-22 BLU

Vacuum

Contactor

Voltage 0V B- (ground) 0 - 1V

37.4V off

0.13V on

Output J2-23 BLU/WHT

Backup Alarm

(-)

Voltage 0V B- (ground)

12.6V off

0.1V on

* It is difcult to validate the signal using a voltmeter. An LED test light such as a logic probe is a better indicator.

** The Solution Pump (-) line provides a switched ground return for the pump. When the solution pump is on, a 5KHz signal with a varying duty cycle and a peak

voltage of 36 volts will appear between this pin and B+. Measuring with a DC voltmeter will give a signal in the range of 6 to 27 volts. Changing the ow rate

solution bars on the LCD should produce a relative increase or decrease of the meter reading.