Master Lock XR20 Wartungshandbuch PDF herunterladen (Seite 51)

Figure 3.14 Monitoring output (a)

voltage and (b) current

Interlock set requires a either a physical short between terminals 26 and 37 of connector JS1 or

application of a 5.0 V source with the positive connection at terminal 37 of JS1 and the negative

connection at terminal 7 of JS1. One of these two connections must be made to enable operation

of the power supply. If the interlock connection is broken then the loc (interlock) LED lights

and the power supply shuts off. As illustrated, digital control lines may be paralleled with other

supplies to allow simultaneous control.

Digital output control lines provide the means to monitor diagnostic functions as well as mode of

operation (voltage or current). All digital output control lines, as illustrated in Figure 3.16, are

connected to connector JS1. Refer to this figure for terminal identification. Each output

monitoring line can drive a 5.0 V, 5.0 mA load. An alarm condition will produce a 5.0 V output

at the respective terminal.

3.7 Diagnostic Functions

Diagnostic functions include thermal overload, interlock, power, standby, phase loss, program

line, over voltage, and over current. All diagnostic indicators have memory retention which

saves the fault condition until the power supply is reset. To clear a fault condition, the user must

press the clear key on the front panel with internal control or by applying 5.0 V to terminal 18 of

JS1 with external control. Alternatively, the supply can be cleared by turning the power supply

off and on.

Diagnostic functions and mode of control are embedded in the supply's closed loop control. The

power supply will operate using voltage control or current control depending on which setting is

lowest. Voltage control and current control also contain a soft start function which causes

voltage and/or current to ramp to the desired set point after power is initiated. The soft start

circuitry is reset upon power-on or operation of any diagnostic function.

Thermal overload indicates that the input power processing devices or output rectifiers have

reached a critical temperature. A resetting thermal breaker will reset upon cooling.

1,2,20

VO2

P/O JS1

VO=10VFS

REF GND

IO2

IO=10V FS

TO SLAVES

INTERLOCK SET

STOP

START

P/O JS1

CLEAR

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Master Lock XR20 Wartungshandbuch Seite 51