Weidmuller G118 User Manual

Weidmuller Ltd. 10 Spy Court Markham, ON L3R 5H6 Tel: (905)475-1507 Fax: (905)475-5855

Weidmuller Inc. 821 Southlake Blvd. Richmond, VA 23236 U.S.A. Tel: (804)794-2877 Fax: (804)794-0252

ISO 9001 Registered

Electronic Interface Modules

G118 Ultra SlimPak®

RTD Input, Field Configurable Limit Alarm

• field configurable via DIP switches for different inputoutput combinations

• provides relay contact closure(s) at a preset RTD/resistance input level

• field configurable input ranges for platinum, nickel and copper RTDs

• setpoints programmable HI or LO and failsafe or nonfailsafe

• LED trip and input indicators

• flexible power supply accepts 9 to 30Vdc

• ASIC technology for high reliability

• CSA approved, UL recognized, CE marked

Description

Diagnostic LEDs

Output

Operation

Dynamic Deadband

The Ultra SlimPak G118 is a DIN rail mount, RTD input limit alarm with dual setpoints and two contact closure outputs. The field configurable input and alarm functions offer flexible setpoint capability. There are up to eight temperature ranges available for each RTD type to ensure accuracy and maximize setpoint resolution. The G118 is configurable as a single or dual setpoint alarm, with HI or LO trips and failsafe or non-failsafe operation. Also included are adjustable deadbands (1% to 5% of full scale input) for each setpoint and a flexible DC power supply which accepts any voltage between 9 and 30Vdc.

The G118 is equipped with three front panel LEDs. The first is a dual function LED labeled IN (input). This green LED indicates line power and input signal status. Active DC power is indicated by an illuminated LED. If this LED is off, check DC power and wiring connection. If the input signal is more than 110% of full scale, the LED will flash at 8 Hz. Below -10%, the flash rate is 4 Hz. Two red LEDs indicate the relay state for each setpoint. An illuminated red LED indicates the tripped condition.

The G118 is equipped with two SPDT (form C) relays, rated at 120Vac or 28Vdc at 5 amperes. Each of these relays is independently controlled by the field configurable setpoint and deadband.

The field configurable G118 limit alarm setpoints can be configured for HI or LO, failsafe or nonfailsafe operation. Each of the setpoints has a respective HI or LO dead-band. In a tripped condition, the setpoint is exceeded and the appropriate red LED will illuminate. The trip will reset only when the process falls below the HI deadband or rises above the LO deadband (see Figure 1). For proper deadband operation the HI setpoint must always be set above the LO setpoint. In failsafe operation, the relay is energized when the process is below the HI setpoint or above the LO setpoint (opposite for non-failsafe). In the failsafe mode, a power failure results in an alarm state output.

LSI circuitry in the G118 prevents false trips by repeatedly sampling the input. The input must remain beyond the setpoint for 100 milliseconds, uninterrupted, to qualify as a valid trip condition. Likewise, the input must fall outside the deadband and remain there for 100 milliseconds to return the alarm to an untripped condition. This effectively results in a "dynamic deadband" - based on time- in addition to the normal deadband.

Figure 1

Note: resistance values for Pt500(M) and Pt1000(M) are 5 and 10 times the resistance value of Pt100(M), respectively

Relay

Tabele 1: RTD input type switch settings (SW2 - 1 through 6)

Tabele 2: Setpoint function switch settings (SW1 - 5 through 8)

Table 3 Input range switch settings (SW-1 through 4)

Conta cts

(optional)

Figure 2: DC Inductive Loads

Relay

Conta cts

Figure 3: AC Inductive Loads

Power

Load

Diode

47 ohm

0.1uF

1/2W

Film