TELEDYNE API 480M, Руководство пользователя

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22 Teledyne API Model 480M O
3
Monitor User Manual 09420A DCN8343
Table 3-1. Status Output Definitions
Status Output Normal Operating State
Sensor OK Active – Connected to ground
Invalid Reading Inactive - Open resistance
Check Lamp Inactive - Open resistance
Pneumatic Flow Inactive - Open resistance
3.4.3. HIGH-CURRENT RELAY OUTPUTS
Three form C relay outputs are provided on the interior I/O connectors (Figure 3-4).
The relays are labeled “Sys OK”, “Hi Alarm”, and “Hi-Hi Alarm.”
The relays are dry contact type form C (SPDT) relays with Normally Open (NO),
Normally closed (NC) contacts and a Common (COM). The relays are capable of
switching up to 250VAC, 5A. For maximum contact life, the relays should only be
used to drive resistive loads.
Important
IMPACT ON READINGS OR DATA
Contact life may be dramatically shortened if inductive
loads are driven without any provision for minimizing
high voltage “inductive kick” that can occur.
See Section 5.2.4.2 to configure the concentration for the alarm trigger.
Table 3-2. Relay Functions
Relay # Function Normal
Operating State
Relay Coils
1 System OK Closed Energized
2 Hi Alarm Open De-energized
3 Hi-Hi Alarm Open De-energized
3.4.4. FAILSAFE OPERATION SIGNAL AND RELAY OUTPUTS
The digital Status outputs and Alarm relays can be configured using the Failsafe
Operation variable (VAR) found in the Display Setup>Vars menu. When the
Failsafe operation has been set to ON, the open collector transistors for the Status
Outputs; Invalid Reading, Check lamp and Pneumatic Flow will switch to ground
and become active.
Additionally, when the Failsafe is ON, the Alarm relays, HI Alarm and HI-HI
Alarm behave the same as the System OK relay. In that the normal operating state,
the relay coils are energized and the (NO) contact closes.