Curtis Instruments AC F4-A User Manual

4 — PROGRAMMABLE PARAMETERS
Curtis AC F4-A Motor Controller – August 2020 Return to TOC
pg. 66
APPLICATION SETUP — MAIN CONTACTOR MENU, cont’d
PARAMETER ALLOWABLE RANGE DEFAULT DESCRIPTION
Open Delay
Open_Delay
0x34CA 0x00
0.0 – 40.0 s
0 – 10000
0.1 sec Applicable only when Interlock Type = 0 or 1. The delay can be
set to allow the contactor to remain closed for a period of time
(the delay) after opening the interlock switch. The delay is useful
for preventing unnecessary cycling of the contactor and for
maintaining battery voltage to auxiliary functions and devices for
a short time after the interlock switch has opened.
See the basic wiring diagram for the main contactor’s location
between the battery and controller.
Weld Check Enable
Weld_Check_Enable
0x34D0 0x00
On/Off
On/Off
On When programmed On, the controller performs a test to make
sure the main contactor is open (not welded shut) before it is
commanded to close. This is accomplished by passing a small
current through a connected motor’ phase leads, to bleed-down
the controller’s capacitor bank a few volts. If the contactor is
“welded shut”, the connected-battery will prevent any voltage
drop.
When this parameter is Off, this test is not performed.
The main contactor driver, however, is always protected from
short circuits if the contactor tips are welded shut.
Note, due to the nature of this test, an unloaded motor may rotate
(oscillate) slightly. This is expected (the physics of the test).
Main DNC Check Enable
Main_DNC_Check_Enable
0x34C2 0x00
On/Off
On/Off
On When programmed On, the controller performs a test immediately
after the commanding the main contactor to close, making sure
the contactor has in fact closed. The test is similar to the Weld
Check, yet in this case, the battery upholds the capacitor voltage.
When this parameter is Off, this test is not performed.
The main contactor driver, however, is always protected from
short circuits if the contactor tips are welded shut.
Note, due to the nature of this test, an unloaded motor may rotate
(oscillate) slightly. This is expected (the physics of the test).
Main DNC Runtime Threshold
Main_DNC_Runtime_Volts
0x34C3 0x00
0.0 – 200.0 V
0 – 20000
5.0 V Sets the threshold used for the ongoing check that ensures the
main contactor remains closed while in operation. The Main
DNC Runtime Threshold is the maximum voltage difference
between the Keyswitch and Capacitor voltages. When the voltage
difference is above this threshold and the battery current is low,
a Main Did Not Close fault will be set. Setting this parameter
lower will increase the sensitivity of the fault detection. Setting
this parameter too low may cause false fault trips due to normal
voltage drops between the keyswitch and capacitor voltages.
Setting this parameter = 0 V will disable the Main Did Not Close
fault check.
Precharge Enable
Precharge_Enable
0x34CC 0x00
On/Off
On/Off
On Turns the precharge feature on and off. Precharge provides a
limited current, via the keyswitch input, to charge the controller's
internal capacitor bank before the main contactor is closed. This
decreases the arcing that would otherwise occur when closing
the contactor with a discharged capacitor bank.
The Precharge must be set to On, to enable the Weld Check.

Curtis Instruments AC F4-A Specifications

General

Brand	Curtis Instruments
Model	AC F4-A
Category	Controller
Language	English