Honeywell 9782 Series manual Wiring Relays, Installation

Input and Output Wiring

6.4 Wiring Relays

6.4.1 Installation

Introduction

Every 9782 model includes two relay outputs that can be used with special features such as AutoClean and output range status indication, or to perform On/Off, Pulse Frequency Type or Duration Adjusting Type control, or for alarm annunication. In additon to these two standard relays, two more are available as an option.

The Analyzer/Controller can be programmed for these relays to de-energize on alarm, or to energize on alarm. Use the maintenance menu to specify relay action. (see 10.11.)

If set to de-energize on alarm, this means that when an alarm occurs (or the discrete control point becomes active), the relay coil will be de-energized. The NC contacts will then be closed and the NO contacts will be open. Conversely, during normal non-alarm operation (or when the control point is not active) the NC contacts will be open, and the NO contacts will be closed.

If de-energize on alarm is selected, a power loss will force all relays to the same position as an alarm condition.

The relay contact maximum ratings are in Table 6-3.

Table 6-3 Relay Contact Maximum Ratings

Current, Standard:

Current, Optional:

Voltage, Standard:

Switching Power, Standard:

0.6amps at 120/240 Vdc, 0.6 amps at 110 Vdc, 2 amps at 30 Vdc

3A, 120 Vac or 28 Vdc

120/240 Vac

ac - 125 VA resistive dc - 60 watts resistive

CAUTION

Alarm circuits are not internally fused in the Analyzer/Controller. Provision for fuses in external circuits is recommended.

Procedure

Follow the procedure in Table 6-3 to install relay output wiring.

If the RC arc suppression circuits in the Analyzer/Controller interfere with other devices at your site, refer to 6.4.2 for instructions for disconnecting the suppression circuits.

If a relay is being used to indicate automatic output range change, see 6.4.3 for guidance in wiring a device to the relay.

7/99 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual 6-7