Woodward MRM4, Руководство пользователя

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Protective Elements
Underload and JAM Trip Function
The protective device issues an alarm when the pickup is exceeded. If the timer has elapsed, a trip signal will be
issued. In the “Underload and JAM Trip Function” curve, the »T
RIP
« settings are represented by vertical lines,
well above the normal load current. This curve also applies to JAM setting configured as an alarm element
(blocked trip command). The trips are held off by the delay timer » t« . Use the start delay to block tripping and
alarming until the motor current drops to continuous load level. Use run delays to avoid nuisance alarms or trips
for load transients.
EN MRM4 01/11 Page 349
Underload Pickup based on
a multiplier of Ib
JAM based on a multipler of Ib
JAM based on a multipler of Ib
Underload Pickup based on a multiplier of Ib
t
[s
]
multiples of Ib
Underload delay time
JAM Delay Time
Underload Trip function, not active
during start delay function.
JAM function, not active
during start delay
function.