38
5.11 SAFE START AND AUTO-RESTART MODES
5.12 OVER TEMPERATURE PROTECTION (OTP)
5.13 LAST SETTING MEMOR
5.14 SERIES OPERATION
When turning on the power supply AC On/Off, it can start to its last setting of Output Voltage and
Current limit with the output enabled (Auto-restart) or start with the output disabled (Safe mode).
Press and hold the OUT button to select between Safe start and Auto-restart modes. The VOLTAGE
display will continuously cycle between "SAF" and "AU7” every 3 seconds. Releasing OUT
pushbutton while one of the modes is displayed, selects that mode. The default setting at shipment
is Safe mode.
In this mode, the power supply restores its last operation setting. Upon start-up, the output is
enabled or disabled according to its last setting.
In this mode, the power supply restores its last operation setting and sets the Output to Off state. At
start-up, the output is disabled and the output voltage and current are zero. To enable the output and
restore the last output voltage and current limit values, momentarily press OUT button.
The OTP circuit shuts down the power supply before the internal components can exceed their safe
internal operating temperature. When an OTP shutdown occurs, the display shows "O7P" and the
ALARM LED blinks.
Resetting the OTP circuit can be automatic (non-latched) or manual (latched) depending on the
Safe or Automatic restart mode.
In Safe start mode, the power supply stays off after the over temperature
condition has been removed. The display continue to shows "O7P" and the ALARM LED
continues to blink. To reset the OTP circuit, press OUT button (or send OUT ON command via the
serial port).
In Auto-restart mode , the power supply recovers to it's last setting
automatically when the over temperature condition is removed.
The power supply is equipped with Last Setting Memory, which stores power supply parameters at
each AC turn-off sequence.
1. OUT On or Off
2. Output voltage setting (PV setting)
3. Output current limit (PC setting)
4. OVP setting
5. UVL setting
6. FOLD setting
7. Start-up mode (Safe orAuto-restart)
8. Remote/Local:If the last setting was Local Lockout (latched mode), the supply will return to
Remote mode (non-latched).
9. Address setting
10. Baud rate
11. Locked /Unlocked front panel (LFP/UFP)
(Items 8, 9, 10 are related to Remote digital control operation and explained in chapter 7)
12. Master/Slave setting
Power supplies of the SAME MODEL can be connected in series to obtain increased output voltage.
Split connection of the power supplies gives positive and negative output voltage.
5.11.1 Automatic start mode (AU7)
5.11.2 Safe start mode (SAF)
1. Safe start mode:
2. Auto-restart mode:
Y
STORED PARAMETERS:
39
Do not connect power supplies from different
manufacturers in series or in parallel.
CAUTION
When power supplies are connected in series, and
the load or one of the output terminals is grounded,
no point may be at a greater potential of +/-60VDC
from ground for models up to 60VDC Rated Output
and +/-600VDC from ground for models >60VDC
Rated Output. When using RS232/485 or IEEE, refer
to
the
OUTPUT
TERMINALS
GROUNDING
warning, section 3.9.11.
5.14.1 Series connection for increased output voltage
In this mode, two units are connected so that their outputs are summed. Set the current limit of
each power supply to the maximum that the load can handle without damage. It is
recommended that diodes be connected in parallel with each unit output to prevent reverse
voltage during start up sequence or in case one of the units shuts down. Each diode should be
rated to at least the power supply rated output voltage and output current. Refer to Fig.5-1 and
5-2 for series operation with local and remote sensing.
+S
+
-
-S
-LS
+LS
POWER
SUPPLY
+S
+
+
-
-
-S
-LS
+LS
POWER
SUPPLY
LOAD
+S
+
-
-S
-LS
+LS
POWER
SUPPLY
+S
+
+
-
-
-S
-LS
+LS
POWER
SUPPLY
LOAD
Fig.5-1: Series connection, local sensing
Fig.5-2: Series connection, remote sensing
Remote programming in series operation for increased output voltage:
1.Programming by external voltage:
2.Using the SO function and PS_OK signal:
The analog programming circuits of this power supply
are referenced to the negative Sense (-S) potential.
Therefore, the circuits used to control each series
connected unit must be separated and floated from
each other.
The Shut-Off and PS_OK circuits are referenced to the
isolated interface common, IF_COM (J1-2,3). The
IF_COM terminals of different units can be connected
to obtain a single control circuit for the power supplies
connected in series.
(*)
(*)
(*)
(*)
(*) Diodes are
user supplied.
WARNING
39
Summary of Contents for Genesys GENH6-100
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