GE Industrial Solutions JNCW016A0R Orca Series - Manual (Page 7)

GE
Data Sheet
JNCW016A0R Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 28.0Vdc Output; 16Adc Output
August 14, 2013 ©2012 General Electric Company. All rights reserved. Page 7
Safety Considerations (continued)
For all input sources, other than DC MAINS, where the input
voltage is between 60 and 75V dc (Classified as TNV-2 in
Europe), the following must be meet, if the converter’s
output is to be evaluated for SELV:
 The input source is to be provided with reinforced
insulation from any hazardous voltage, including the ac
mains.
 One Vi pin and one Vo pin are to be reliably earthed, or
both the input and output pins are to be kept floating.
 Another SELV reliability test is conducted on the whole
system, as required by the safety agencies, on the
combination of supply source and the subject module
to verify that under a single fault, hazardous voltages
do not appear at the module’s output.
All flammable materials used in the manufacturing of these
modules are rated 94V-0, or tested to the UL60950 A.2 for
reduced thickness.
The input to these units is to be provided with a maximum
25 A fast-acting or time-delay fuse in the ungrounded input
connection.
Feature Description
Remote On/Off
Two remote on/off options are available. Positive logic turns
the module on during a logic high voltage on the ON/OFF
pin, and off during a logic low. Negative logic remote On/Off,
device code suffix “1”, turns the module off during a logic
high and on during a logic low.
To turn the power module on and off, the user must supply a
switch (open collector or equivalent) to control the voltage
(V
on/off
) between the ON/OFF terminal and the V
IN
(-) terminal
(see Figure 10). Logic low is 0V ≤ V
on/off
≤ 1.2V. The maximum
I
on/off
during a logic low is 1mA, the switch should be
maintain a logic low level whilst sinking this current.
During a logic high, the typical maximum V
on/off
generated
by the module is 5V, and the maximum allowable leakage
current at V
on/off
= 5V is 50μA.
If not using the remote on/off feature:
For positive logic, leave the ON/OFF pin open.
For negative logic, short the ON/OFF pin to V
IN
(-).
Figure 10. Circuit configuration for using Remote On/Off
Implementation.
Overcurrent Protection
To provide protection in a fault output overload condition,
the module is equipped with internal current limiting
protection circuitry, and can endure continuous overcurrent
by providing constant current output, for up to 4 seconds, as
long as the output voltage is greater than V
trimMIN
. If the load
resistance is to low to support V
trimMIN
in an overcurrent
condition or a short circuit load condition exists, the module
will shutdown immediately.
A latching shutdown option is standard. Following
shutdown, the module will remain off until the module is
reset by either cycling the input power or by toggling the
on/off pin for one second.
An auto-restart option (4) is also available in a case where
an auto recovery is required. If overcurrent greater than 19A
persists for few milli-seconds, the module will shut down
and auto restart until the fault condition is corrected. If the
output overload condition still exists when the module
restarts, it will shut down again. This operation will continue
indefinitely, until the overcurrent condition is corrected.
Over Voltage Protection
The output overvoltage protection consists of circuitry that
monitors the voltage on the output terminals. If the voltage
on the output terminals exceeds the over voltage protection
threshold, then the module will shutdown and latch off. The
overvoltage latch is reset by either cycling the input power
for one second or by toggling the on/off signal for one
second. The protection mechanism is such that the unit can
continue in this condition until the fault is cleared.
An auto-restart option (4) is also available in a case where
an auto recovery is required.
Remote sense
Remote sense minimizes the effects of distribution losses by
regulating the voltage at the remote-sense connections (see
Figure 11). For No Trim or Trim down application, the voltage
between the remote-sense pins and the output terminals
must not exceed the output voltage sense range given in
the Feature Specifications table i.e.:
[V
o
(+)–V
o
(-)] – [SENSE(+) – SENSE(-)] 2% of V
o,nom