GW Instek PSP Series User Manual
Page 13
PSP SERIES
USER MANUAL
20
9-3. Cleaning
To clean the power supply, use a soft cloth dampened in a solution
of mild detergent and water. Do not spray cleaner directly onto
the instrument, since it may leak into the cabinet and cause
damage. Do not use chemicals containing benzine, benzene,
toluene, xylene, acetone, or similar solvents. Do not use abrasive
cleaners on any portion of the instrument.
9-4. Fan Control
1) The fan of the power supply will not work upon power on
until the temperature or load current reaches the condition as
follows:
z Temperature oriented:
When the temperature of the power supply reaches to range
of 45℃±5℃ for 5 to 6 seconds, the fan starts to work,
while the temperature is less than 40℃±5℃, the fan stops
rolling.
z Load current oriented:
The load current varies with different model of power supplies.
After the load current reaches to the value as shown below, the
fan will keep on rolling.
Model
Load Current
Fan
Load Current Fan
PSP-405
2.10A±50mA
On
1.80A±50mA
Off
PSP-603
1.40A±50mA
On
1.20A±50mA
Off
PSP-2010
2.10A±50mA
On
1.80A±50mA
Off
2) To avoid damaging the power supply, if the fan failed to work
when the temperature or current has reached to the specific
condition, please power off the instrument and contact our local
distributor for service.
PSP SERIES
USER MANUAL
21
10. APPENDIX: Connecting the Programmable Power
Supply via RS232 Interface
The RS232 interface capabilities:
The RS232 interface provides a point-to-point connection between two
items of equipment such as a computer and the power supply. There
are some parameters you need to set on the both sides. Once you have
set these parameters, you can control the power supply through the
RS232 interface.
z
Baud rate: 2400 baud.
z
Parity bit: none.
z
Data bit: 8 bits.
z
Stop bit: 1 stop bit.
z
Data flow control: none.
Notes for RS232 installation
The power supply is a DTE device with a 9-pin D-type shell RS232
connector located on the rear panel. Figure 1 shows the equipment of
9-pin connector (Male) with its pin number assignments. Figure 2
shows the wiring configuration for DB9 to DB9. When the
programmable power supply is set up with a RS232 interface, please
check the following points:
z
Do not connect the output line of one DTE device to the output
line of the other.
z
Many devices require a constant high signal on one or more input
pins.
z
Ensure that the signal ground of the equipment is connected to
the signal ground of the external device.
z
Ensure that the chassis ground of the equipment is connected to
the chassis ground of the external device.
z
Do not use more than 15m of cable to connect devices to a PC.
z
Ensure the same baud rate is used on the device as the one used
on PC terminal.
z
Ensure the connector for the both side of cable and the internal
connected line are met the demand of the instrument.