CPFE1000FI SERIES
POWER SUPPLY
OPERATION MANUAL
13
19 August 2020
13. Power ON Signal (ENA terminal)
This signal is located at the secondary side (output side) and is internally connected to a 5V source via a
4.99kΩ pullup resistor. (Maximum sink current is 100mA and maximum applied voltage is 50V.)
Return line for ENA terminal is the COM terminal. When output voltage goes over a specified voltage level
at start up, Power ON signal is LOW.
Output voltage threshold level above which the Power ON signal is LOW:
CPFE1000FI-12
: 8V (TYP)
CPFE1000FI-28
: 19V (TYP)
CPFE1000FI-48
: 33V (TYP)
Output voltage threshold level below which the Power ON signal is HIGH :
CPFE1000FI-12
: 6V (TYP)
CPFE1000FI-28
: 15V (TYP)
CPFE1000FI-48
: 28V (TYP)
14. AC Good Signal (AC_OK terminal)
This signal is located at the secondary side (output side) and is internally connected to a 5V source via a
4.99kΩ pullup resistor. (Maximum sink current is 100mA and maximum applied voltage is 50V.)
Return line for AC_OK terminal is the COM terminal. When sufficient AC voltage is present on the input to
enable the unit to function the AC_OK signal is LOW.
15. Power OK Signal (PWR_OK terminal)
This signal is located at the secondary side (output side) and is internally connected to a 5V source via a
4.99kΩ pullup resistor.. (Maximum sink current is 100mA and maximum applied voltage is 50V.)
Return line for PWR_OK terminal is the COM terminal.
The PWR_OK signal is the logical conjunction of the ENA signal AND the AC_OK signal. The PWR_OK
signal is LOW when both the ENA signal and the AC_OK signal are LOW. The PWR_OK signal is HIGH if
either the ENA Signal or the AC_OK signal are HIGH.
16. Voltage Share Signal (VSH terminal)
The VSH terminal is used during parallel operation to prevent any single unit from going into current limit
during start-up while under load. For proper operation, the VSH terminals from each unit should be connected
together.
Entering any fault condition or removing the AC input voltage will result in the VSH signal changing.
When recovering from any condition that triggers a change in the VSH signal, the output recovery may be
delayed for up to 20 seconds to allow for proper restart.
17. Over temperature Warning Signal (OTW terminal)
This signal is located at the secondary side (output side) and is internally connected to a 5V source via a
4.99kΩ pullup resistor. (Maximum sink current is 100mA and maximum applied voltage is 50V.)
Return line for OTW terminal is the COM terminal.
When the temperature of the unit increases to within approximately 20°C of the OTP limit, the OTW signal
goes HIGH.
When the temperature of the unit is less than approximately 20°C below the OTP limit, the OTW signal goes
LOW.
The OTW signal must go LOW before the unit will attempt to recover from an OTP condition.
If any output fault (OVP, OCP, OTP or Short Circuit) occurs while the OTW signal is HIGH, the unit will
not try to recover until after the OTW signal goes LOW.
