Weidmuller G118 User Manual

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

Weidmuller Ltd.

10 Spy Court

Markham, ON L3R 5H6

Tel: [phone]

Fax: [phone]

Weidmuller Inc.

821 Southlake Blvd.

Richmond, VA 23236 U.S.A.

Tel: [phone]

Fax: [phone]

ISO 9001 Registered

Power + -

Load

Relay

Contacts

Diode

(optional)

47 ohm 0.1uF 1/2W Film

Figure 2: DC Inductive Loads

Power

Load

Relay

Contacts

MOV

47 ohm 0.1uF 1/2W Film

Figure 3: AC Inductive Loads

Tabele 1: RTD input type switch

Tabele 2: Setpoint function switch

settings (SW2 - 1 through 6)

settings (SW1 - 5 through 8)

Table 3 Input range

switch settings (SW-1 through 4)

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

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 non-

failsafe 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 Figure 1 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 timein addition to the normal

deadband.