PISA11

PISA11-Series

A

Output Terminals (plus (+) pole connection points)

B

Red Failure LEDs

The red LEDs are failure indicators. Any time a red LED is on or

blinking, the outputs have been shutdown.

Three reasons why the outputs have been shutdown:

1) The output current of one or more individual output channels was

too high. In this case, the affected output channel LED is blinking

and all others are illuminated.

2) The sum of the output current of all four output channels was

exceeded. In this case, all red LEDs are blinking.

3) The outputs needed to be shutdown in order to maintain sufficient

input voltage. In this case, all red LEDs are on and the green LED

(Input Status) is blinking.

The outputs can also be turned off by pushing the ON/OFF button on

the front of the unit or by applying an external signal to the ON/OFF

signal input. In this case, all red LEDs are on.

When LED 1 and 4 as well as the LEDs 2 and 3 are alternately blinking,

an internal error has occurred. Try to reset the unit by pushing the

reset button. If this does not help, ship the unit to the factory for

inspection.

C

ON/OFF and Reset Button

This is a pushbutton which can be used for two purposes:

1) In a failure mode (outputs have shutdown), the outputs can be

turned on again by pushing and holding the reset button for more

than 1 second.

2) In normal mode (outputs have not shutdown), a short (> 50ms) push will turn all outputs ON or OFF.

The unit will be shipped (factory setting) with the outputs turned-on. The ON/OFF function has no safety feature

included.

D

Synchronization Bus (connection by plug-connector on the front), See also chapter 10.

If multiple PISA modules are used on the same power supply, it is recommended to connect the sync. bus of all

modules together. If one unit shuts down due to the protection function of the input voltage protection circuit, all

other modules will shutdown too. This avoids a false interpretation of which output channel caused the problem.

If the cause for the shutdown was an over-current of one individual channel only this module will shutdown and

the other modules will stay on. In this case the sync. line has no impact on the other modules.

E

Output-OK Relay Contact (connection by plug-connector on the front), See also chapter 8.

This relay contact is closed when the input voltage is sufficient and all outputs are not shutdown.

F

Inhibit / Reset Signal Input (connection by plug-connector on the front), See also chapter 9.

This signal input is galvanically isolated with an integrated optocoupler and works in the same manner as the reset

and ON/OFF button. The ON/OFF function has no safety feature included.

1) In a failure mode (outputs have shutdown), the outputs can be turned on again by applying a voltage for more

than 1 second.

2) In normal mode (outputs have not shutdown), a short (> 50ms) voltage pulse will turn all outputs ON or OFF.

G

Green Input Status LED

This LED indicates the status of the input. The green LED is illuminated if the input voltage is higher than 21Vdc.

The green LED will blink when the input protection circuit (Safeguard) is activated in order to protect the supply

voltage from dropping below 21V or when the outputs have already been shutdown due to a low input voltage.

H

Input Terminals

Two minus (-) connection points for simpler load distribution or grounding (earthing) of the minus (-) pole.

Please note:

Outputs which have shutdown must be turned on manually by pushing the reset button or by an external reset signal

(ON/OFF signal input). A cycling of the input power does not reset the unit. The failure signals are stored until a reset

is intentionally initiated.

May 2014 / Rev. 1.7 DS-PISA11 - data sheet -

All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.

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