7100S User Manual 1-9
Identification
ALARMS (Options
GRF option
Serious alarms Total load failure (TLF) and thyristor short circuit (THSC)
detection.
Signalling When a serious alarm is detected:
• the red ‘GRF’ LED is lit
• the alarm relay contact is activated.
DLF option
Diagnostic alarm
Partial load failure detection and diagnosis.
Important: For SWIR
elements the DLF option applies:
• if the elements are powered at nominal voltage and
• in ‘Single-cycle’ mode only (available with digital
communication option or with Eurotherm REMIO/TPO or
i7000 synchronised interfaces).
Signalling
If a partial load failure (PLF fault) is detected:
• the orange ‘DLF’ LED is lit
• the alarm relay contact is activated.
Settings The front panel push button is used for:
• monitoring and diagnosis
• adjusting and resetting the alarm.
Sensitivity Detects the failure of at least one heating element for six
identical elements connected in parallel
(one element in four for SWIR elements).
Extension The DLF option includes Serious alarm monitoring
(GRF option included).
Over-temperature alarm
Operation For all fan-cooled units (≥250 A), the unit stops firing if the
temperature threshold is exceeded regardless of the options
fitted.
Signalling Red ‘T°’ LED and Alarm relay contact
(if one of the alarm options is selected).
Alarm relay Fitted if one of the alarm options is selected.
The relay contact (0.25 A/230 Vac or 30 Vdc) is either open on
alarm or closed on alarm depending on the product code.
RETRANSMISSION or COMMUNICATION (exclusive options
RETRANSMISSION
Availability Isolated analogue retransmission is available with the DLF
option but without the digital communication option.
Retransmitted value Analogue image of rms load current.
The rms current is calculated:
• over the modulation period (in burst mode with ATP input)
• over a fixed duration of 1.6 s (Logic mode, LDC or HAC input).
Output signal Selected on ordering:
• 4-20 mA current, Vmax = 12.5 V on 500 Ωresistor
• 0-10 V voltage, Imax = 24 mA on 500 Ωresistor.
Power supply 24 Vac (±20%), 47 to 63 Hz or 24 Vdc (±20%) non-polarised.
Typical consumption 1.5 VA
Protection: external 2 A fuse.