IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 179
5.7.9 Fault Latch Selection
The Fault Latch function allows specific faults to become “latched” after the automatic fault reset attempts (L09-02)
has maxed out. The Reset key on the keypad will be blocked from clearing the fault, and the fault can only be
cleared by the methods explained below. In the case of a power loss, the fault will remain latched when power is
restored.
A latched fault can be cleared in three ways:
1. The recommended method is to program an MFDI (H01-xx) to 48 (Flt Latch Reset). The digital input must be
toggled (ON and then OFF) in order for the fault to clear. Since this feature is intended for safety, a key switch
is recommended. This will prevent the recurring fault from being continuously cleared and ignored unless the
key is present and toggled.
2. A second method for clearing the fault is using the Monitor tool within IMPULSE
®
•Link.
3. The F1 or F2 keypad key can be programmed to 48 (Flt Latch Reset). When a fault is latched, simply pressing
the F1 or F2 key twice will reset the fault.
NOTE: An MFDI and F1/F2 keys are allowed to be programmed after a fault is latched.
Table 5-104: Fault Latch Selection Parameter Settings
* To program parameters L09-07 and L09-08, refer to the Auto Fault Reset example. The same concept also applies here.
Table 5-105: Auto-Reset Programming
Parameter Display Function Range Default
L09-07* Flt Latch Sel 1 Fault Latch Select 1 0000–FFFF 0000
L09-08* Flt Latch Sel 2 Fault Latch Select 2 0000–FFFF 0000
Digit 4 Digit 3 Digit 2 Digit 1
HEX 0000
Binary 0000000000000000
L09-07 - - - PPUDSBBBBBBBB
- - - GGLENEEEEEEEE
- - -OO3VA87654321
12 P
HH
HEX 000 0
Binary 0000000000000000
L09-08 BBBBEEEEOOULOOOO
EEEEFFFFSVVCLLTT
76545678 1 1212
2222
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